Arvind Sharma, BDS(Dund), MSc(Endo), MJDFRCS(Eng), MFDSRCPS(Glas)
Arvind Sharma presents the second and final part of a structured critical review to evaluate the question whether the use of cone beam computed tomography (CBCT) in endodontics has an influence on clinical decision-making.
The methodology of this review is based on the aforementioned steps, as suggested by Boland et al 2014. Below is a brief summary of the methods used.
The following structure was therefore employed:
The topic considered was discussed with my supervisor and also with my peers to solicit their views.
The author attended a British Endodontic Society conference held in London in March 2015 and met Dr Patel (one of the speakers that day) when the topic of this review was discussed.
The author and Dr Patel corresponded by email, and Dr Patel suggested that there is a lack of evidence in this field due to lack of clinical studies and suggested that a systematic review would be difficult in his opinion. This led the author and his supervisor to consider a structured critical review instead.
Due to the aforementioned reasons and since the author’s time and resources are limited, a traditional systematic review was not possible. It was decided, therefore, to design and conduct a structured critical review of the literature to answer the question posed.
|F&T Level||Studies Identified|
|3-Diagnostic Thinking Efficacy||4|
|5-Patient Outcome Efficacy||1|
Table 4: Summary of included studies with associated F&T hierarchy levels
The review question was then formalised as a statement of my intention of the structured critical review. This was developed from what was found through the available evidence to what I further planned to find out. A theoretical approach, exploring factors that lead to a process, was to be taken.
The search identified eight publications that qualitatively or quantitatively assessed the use of CBCT in endodontics combined with clinical decision-making with respect to three levels of a six-tiered hierarchical model. (Level 3 diagnostic thinking efficacy, Level 4 therapeutic efficacy and Level 5 patient outcome efficacy).
The following table (table 3), shows the final eight papers that were included in this study along with the F&T hierarchy levels.
As can be seen from the above table (table 4), four papers were identified investigating the diagnostic thinking efficacy, three papers investigating the therapeutic efficacy and one paper investigating patient outcome.
Of all the eight studies, six concluded that CBCT made an influence in clinical decision-making and two did not.
A meta-analysis was not performed. Only a narrative summary of the data is presented since the included studies did not meet the criteria for conducting a meta-analysis. The differences across the trials, including inconsistent patient characteristics presented in some of the papers, small sample sizes, diversity in protocols (interventions and comparators were not uniform across all studies), and the inconsistency in reporting outcomes (not all studies reported the same results), including statistical data (not present in one study), precluded a statistical synthesis of the included trial results.
The aim of this structured critical review was to answer the question, “does the use of CBCT in endodontics influence clinical decision making?” Of the eight studies chosen for this review, 75 per cent concluded that CBCT did influence decision-making whereas 25 per cent of studies concluded that CBCT did not influence clinical decision-making.
From the evidence analysed in this review, CBCT appears to have a positive influence in clinical decision-making in endodontics. However, when data was extracted, the six studies (75 per cent) did show limitations, which will be discussed below.
Although the literature search provided an abundance of evidence on CBCT, the evidence available relating to the review question was limited. When considering the hierarchy of evidence (randomised controlled trials being the most robust form of study) and application of the inclusion criteria to the results of the searches there was a lack of studies in this area with only nine studies meeting criteria. One of the reasons for this is due to ethical considerations in relation to the exposure of patients to radiation when taking a CBCT for an in-vivo trial/study. So, although CBCT is being more commonly used in clinical endodontic practice, the number of in-vivo studies is lacking. This was further confirmed by personal communications with the well-published author and committee member of the European Society of Endodontology, Dr Shanon Patel.
The limited literature search was further compounded by the fact that Fryback and Thornbury Levels 3, 4 and 5 were applied and this resulted in fewer relevant studies. A number of studies were found but were mainly on levels 1 (technical quality of image) and 2 (diagnostic accuracy, sensitivity and specificity). The inclusion criteria of human, English language and in-vivo studies again limited the number of studies since published animal and foreign language studies were excluded. Applying a search for ‘all studies’ gave a wider net for the search with non-relevant studies due to their hierarchical level of evidence being excluded. This was the case with Kurt et al 2003, which was a cross-sectional observational study.
Considering the available studies, the author believes that all or at least a representative sample of the available evidence relating to the study question was obtained.
|Study||Study Title||F&T Levels|
|1. Abuabara et al 2012||Efficacy of clinical and radiological methods to identify second mesiobuccal canals in maxillary first molars||3|
|2. Balasundaram et al 2012||Comparison of Cone-beam computed tomography and periapical radiography in predicting treatment decision for periapical lesions: |
a clinical study
|3. Davies et al 2015||The detection of periapical pathoses using digital periapical radiography and cone beam computed tomography in endodontically retreated teeth-part 2: |
a one- year post-treatment follow-up
|3 + 4|
|4. Ee et al 2014||Comparison of endodontic diagnosis and treatment planning decision using cone-beam volumetric tomography versus periapical radiography||4|
|5. Hashem et al 2015||Clinical and radiographic assessment of the efficacy of calcium silicate indirect pulp capping: a randomised controlled clinical trial||3|
|6. Kurt et al 2014||Outcomes of periradicular surgery of maxillary first molars using a vestibular approach: a prospective, clinical study with one year of follow-up||5|
|7. Mota de Almeida et al 2014||The impact of cone beam computed tomography on the choice |
of endodontic diagnosis
|8. Mota de Almeida et al 2014||The effect of CBCT on therapeutic decision-making in endodontics||4|
Table 3: The final eight papers included in this study
Overall, on a hierarchy of evidence, since only two randomised controlled trials were included, the evidence gathered was not of the highest calibre. The included studies all had limitations that were either discussed by the individual authors or were identified during this review’s quality assessment process. The limitations identified included, small sample sizes in most studies, history and clinical information (signs and symptoms) not always provided, the number and clinical experience of observers varied from novice to most skilled, the radiation dose used with the CBCT modality was not always validated, the resolution of CBCT images was not always discussed as image enhancement may or may not have affected the image quality and hence results and detailed statistical data were not disclosed in three studies.
In one study where periradicular surgery was being performed, a microsurgical approach was not used, which is now accepted as the gold standard in retrograde endodontics, both in Europe and North America. The ability, for example, to identify artefacts due to beam hardening that could be misdiagnosed as a carious lesion is an important point. Therefore, image interpretation is still an area that requires further training especially for less experienced clinicians.
There were limitations with this structured critical review study with respect to the time that was spent on the literature search, the final selection of the chosen studies, the quality assessment and data extraction. This was mainly due to the part-time nature of this study and there only being one individual, namely the author, executing the various stages of this structured critical review.
It is the author’s opinion that by having more than one individual working on various aspects of this study, bias may have been eliminated, leading to a more rigorous study process.
The limitations were related to the methodological part of this study. Specifically:
With all of the above limitations considered, it is the author’s opinion that a thorough and reproducible literature search was performed using appropriate and relevant search terms, quality assessment of the chosen studies enabled the most appropriate studies to be used for data extraction purposes and since the conclusions reached for this critical review process are similar to other reviews in this field of study, the author is confident that the review process was conducted with appropriate methodology, is clear, reproducible, thorough and transparent.
Although the overall findings of this review seem to suggest that CBCT is influential in clinical decision-making, it is the author’s opinion that the findings cannot be generalised and applied to the everyday clinical practice of endodontics. There was disparity in the studies in terms of their design, sample size, age range, male-female ratio, setting, sample definition, F&T level, examiners used (experience and number of) and use of statistical data, which means it is difficult to make an absolute comparison of outcomes and reach a definitive conclusion based on the chosen studies. CBCT does have an important place in endodontic clinical decision-making but its use should still be limited as ESE recommend.
In conclusion, this critical review has shown that although most of the available evidence appears to show that CBCT does influence clinical decision-making in endodontics, high-quality longitudinal studies are lacking, and more research is required. Based on the current available evidence, the ESE guidelines seem appropriate and should be applied accordingly. The studies by Balasundaram et al 2012, Davies et al 2015 and Mota de Almeida et al 2014 all looked at the detection of periapical radiolucencies and, as discussed earlier, did not concur with their results. CBCT has a useful place in clinical decision-making in endodontics but its use should be kept for complex cases where radiographs do not give sufficient information. This would resonate with the ESE guidelines.
As discussed earlier, there are implications in using CBCT, namely, cost of equipment, training required for the use and interpretation of CBCT and importantly the radiation dose the patient is exposed to. No doubt, CBCT can be relevant and useful in endodontics and can have an influence in clinical decision-making, which in turn may help a patient with complex symptoms that routine investigative methods have proved limited. However, the overall consensus of the studies do not recommend the routine use of CBCT in endodontics but recommend its consideration when other methods of diagnosis prove to be inconclusive in reaching a definitive diagnosis. Again, this would in line with guidelines produced by the ESE. Looking into the future, if CBCT equipment can expose the patient to less radiation, perhaps in line with the amount produced by intra-oral radiographs, its use may well increase particularly if coupled with a more affordable price tag. Increasing CBCT education at undergraduate and postgraduate level would improve knowledge and application in the clinical setting. This would ultimately give the clinician more tooth detail, which could in turn improve patient care and the reputation of endodontics as a dental discipline amongst patients.
This structured critical review has shown that there is limited evidence on the influence of CBCT in clinical decision-making in endodontics. The available evidence does however seem to suggest that there is a place, although limited, for CBCT use in endodontics with decision-making. Application of ESE guidelines should be followed until further research can be carried out in this interesting and clinically relevant imaging modality
Aims and objectives
To give the reader an understanding of CBCT as a modern imaging tool and its application in endodontics
To provide details of the evidence surrounding clinical decision making in endodontics
To highlight the clinical applications where use of CBCT in endodontics would be advantageous
To understand the basics of how CBCT works
and its clinical application in endodontics
To be able to recognise when the use of CBCT
may help clinical decision-making
What kind of process was used to carry
out the research?
a) Systemic review?
b) Randomised controlled trial?
c) Structured critical review?
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Ms B attends as a new patient at a local dental surgery complaining of sensitivity in a number of teeth. A dental associate – Mr W – arranges bitewing radiographs and these show extensive distal caries at LR6 and caries in a number of other teeth. He advises that LR6 is of most concern and recommends treatment by an amalgam filling, given the size and depth of the caries. Ms B insists on a composite filling as it looks more “natural”. Mr W agrees but records his discussion with the patient regarding the pros and cons of composite versus amalgam filling in this particular case.
Mr W places an extensive composite filling at LR6 but moisture control is difficult as Ms is intolerant of dental dam, has excess saliva and there is gingival bleeding due to the size of the cavity. Ms B is also phobic and “fidgety” and keeps closing her mouth. Mr W informs the patient that given the extent of the cavity and difficulty of the procedure, root canal treatment (RCT) may be necessary in the future if the tooth does not “settle”. Ms B is also advised that a small amount of decay remains, again due to the size of the cavity.
Ms B attends a different dentist complaining of pain in LR6. The dentist also notes untreated caries in three other teeth. A radiograph reveals decay under the filling at LR6 and the dentist undertakes the first stage of RCT and the tooth is appropriately dressed.
The patient returns to the new dentist and undergoes root canal treatment on LR6 and another appointment is scheduled to carry out further restorations on the other untreated caries, including crowning of LR6.
A letter of claim for clinical negligence is received by Mr W from solicitors acting on behalf of Ms B. It alleges incomplete removal of caries at LR6 and also inadequate moisture control resulting in a reduced bond in the composite filling causing recurrent caries and chronic pain with later irreversible pulpitis necessitating root canal treatment.
Ms B claims damages amounting to the cost of the RCT and crowning of LR6 as well as loss of earnings due to time off work due to chronic pain.
MDDUS obtains copies of the patient notes and all relevant radiographs and sets out a letter of response based on a detailed case report. It is argued that Mr W carried out the initial restoration on LR6 in very challenging circumstances and to the best of his ability – as would any reasonable and competent general dental practitioner.
Moisture control was difficult given the problems of a phobic patient, restricted access and intolerance of dental dam. Mr W used high aspiration, cheek retraction and cotton wool to absorb moisture the best he could. To the extent there may have been a reduced bond this was more likely to do with the extent of the cavity and use of a composite filling rather than amalgam as was advised by the dentist. Amalgam may not be as aesthetically pleasing, but it will restore a tooth even in the presence of moisture whereas with composite materials moisture control is essential as bonding is actively to the tooth substance.
In regard to causation, MDDUS argues that the root canal treatment could not be the result of any act or omission by Mr W. The patient presented with extensive caries in LR6 and rejected the dentist’s advice on an amalgam filling and – on the balance of probabilities – would have thus required root canal treatment at LR6 in any event.
It is clear that not all the decay was removed in Mr W’s restoration of LR6, but it would not be unreasonable to leave some decay, restore the tooth appropriately, advise the patient accordingly and keep the tooth in question under review both clinically and radiographically.
MDDUS sends the letter of response and receives notification that the case is being dropped.
About the author
Aubrey Craig is head of dental division at MDDUS. For more information, go to www.mddus.com
Due to its powerful regenerative properties, platelet rich growth factor Endoret (PRGF) is being increasingly used in many fields of medicine, such as plastic surgery and dental implantology.
It has been shown to reduce scarring, rejuvenate damaged facial tissue, and accelerate wound healing. Endoret (PRGF) is proven to promote angiogenesis, cell migration, cell proliferation and the secretion of growth factors active in the wound healing cascade, while at the same time decreasing inflammation and pain.
Through this simple case report, I would like to show how Endoret (PRGF) can be applied in the field of dental implantology to make treatment outcomes more predicable by optimising healing conditions.
Step one is to collect a small quantity of the patient’s blood. Four collection tubes, each containing 9ml of blood, are filled. A total of 36ml is usually sufficient for most implant cases (Fig 1) However, in larger cases where more augmentation is required it is usual to collect eight tubes (72ml).
Once the blood has been collected, the patient is asked to return to the waiting area while the fractionation process is carried out which takes about 15 minutes. The collection tubes are transferred to the centrifuge machine (Fig 2). At the end of the eight-minute cycle, the collection tubes are immediately returned to their stand. It is important that this is done carefully with minimal disruption to the blood, which is now separated into four distinctive bands.
Each tube is now marked. The erythrocytes are heaviest and lie in the bottom half.
Next is a thin buffy layer approximately 0.5cm thick. This is the leukocyte fraction which must be avoided as these cells will evoke pain and inflammation.
In the top half of the tube is the liquid fraction of interest. Concentrated in platelets, plasma and growth factors, this straw-coloured layer is itself divided into two fractions: 1 and 2.
While fraction 1 (F1) is richer in the fibrin, which will create the collagen matrix for wound healing, fraction 2 (F2) contains the greatest concentration of platelets and protein markers. It is these protein markers which signal to the regenerative cells and trigger their activity.
Marking each tube, a safe distance of 0.5cm from the visible upper limit of the buffy layer, you then measure two centimetres up and mark the tube again. This threshold divides the most superior layer F1 from the second layer F2 (Fig 3).
Using the plasma transfer device, F1 and F2 are then separated into labelled collection tubes F1 and F2. Without activation, these fractions will remain viable for up to four hours.
At this point, I will normally ask for the patient to return and we follow the usual asepsis protocol for surgery and deliver the local anaesthetic and or intravenous sedation where required. When placing implants, I always require two dental surgery assistants, one sterile and the other non-sterile.
Depending on the planned length of the procedure, I will indicate to my assistants when F1 and F2 should be activated with calcium chloride (Fig 4). Once activated the fractions are transferred into sterile glass bowls and placed into a special oven that incubates them at body temperature for 15-25 minutes (Fig 5).
Endoret (PGRF) is used in three distinct forms. There is the clot (F2), into which autogenous bone collected during implant site preparation is added, and also xenograft in situations where more augmentation is required (Fig 6).
There is the fibrin membrane (F1), which is placed on top of F2 (Fig 7). This stimulates fibroblasts which accelerates wound closure and often creates thicker mucosal biotype.
The liquid form of Endoret (PRGF) is used to promote healing after ridge-splitting procedures, and to improve implant integration by up to 40 per cent when the implant surface is coated immediately before placement.
In this simple case, all three forms of Endoret (PRGF) were used to achieve a small lateral augmentation of the implant site, as well as promote osseointregration of the implant and wound closure by primary intention.
A number 15 scalpel was used to make a palatally inclined incision at the site of the missing upper right first premolar. This cut was extended mesially and distally around the adjacent teeth without relieving incisions.
A number 12 scalpel was then used to make a periosteal releasing incision in the pocket flap created being mindful of the proximity of the infra-orbital nerve.
After the creation of the pilot hole using a drill with irrigation at 1800rpm, the remainder of the osteotomy was created following a biological drilling protocol advocated by Professor Eduardo Anitua, Scientific Director of BTI Biotechnology Institute.
This involves preparation without irrigation at speeds of between 50 and 150 rpm. A high level of control can be maintained at these low speeds while biologically viable autogenous bone debris can be collected from the drill flutes, which is transferred to the F2 for later augmentation.
Immediately before implant placement, the selected implant’s entire surface was dipped in liquid Endoret (PRGF). The liquid was also injected into the osteotomy. Engine placement of the Implant then proceeded as per normal protocol.
Lateral augmentation was completed easily and safely without the need for a membrane and in this case, without xenograft either. The F2 clot containing the collected autogenous bone drill debris was first placed against the bone (Fig 8). In situations where more lost bone volume needs to be replaced, a second clot of F2 containing xenograft is layered on top of the autogenous layer. Finally, the F1 fibrin membrane was placed on top (Fig 9).
The wound was closed with three interrupted sutures, which were removed after four days (Fig 10).
The autologous nature of Endoret (PRGF) means it has many applications in dentistry beyond the simple implant case described here.
In the atrophic maxilla where residual bone height below the sinus is very low, Endoret (PRGF) in combination with short implants can be used in a transalveolar elevation approach to gain 2-3mm of additional bone height very safely. Such an approach is now being used widely to avoid more traditional and invasive methods such the lateral window technique.
In the field of oral surgery accelerated and improved healing has obvious benefits; for example, the avoidance of dry socket through socket preservation with Endoret (PRGF), and the treatment of bisphosphonate osteoradionecrosis where necrotic bone has been resected.
Combining Endoret (PRGF) with traditional guided bone regeneration procedures significantly reduces the incidence of wound dehiscence as well as eliminating the need for costly and technique sensitive collagen membranes. When mixed with xenografts such as Bio Oss, Endoret (PRGF) will attract the osteogenic cells necessary to promote true bone formation.
Backed up by more than 15 years of research, and with more than 700,000 patients treated from 20 countries without adverse effects being reported, the applications for Endoret (PRGF) in surgical dentistry are wide-ranging, predictable and safe.
Dr Jerome P Sullivan BDS, DipImpDent RCS (Eng), PG cert sed UCL qualified from Manchester University in 1993. He graduated with a diploma in dental implantology from the Royal College of Surgeons (UK) in 2011 and was awarded an inaugural gold medal for the high standard of his clinical cases. He has become increasingly involved in the field of platelet rich growth factor, and he now uses this technique to deliver implant solutions to patients with complex dental needs
For more information please contact Info@gracefielddental.ie
Periodontitis is a term that refers to a heterogeneous group of diseases characterised by loss of the tooth-supporting tissues. It is well established that periodontal diseases are of an infectious nature and the impact of dental plaque biofilms on the etiology of periodontal diseases has been studied in details. In fact, certain bacterial pathogens are considered to play a significant role in the pathogenesis of periodontitis, formation of the periodontal pocket, destruction of the connective tissue and resorption of the alveolar bone.
Therefore, the primary cause of periodontitis is bacteria, and when the quantitative and qualitative change in bacterial composition in the oral cavity is such that homeostasis cannot be maintained any longer, the host response appears to be impaired and the activity of the tissues become abnormal.
A publication from Hasturk et al. (2007) outstandingly defined the possible pathogenesis of the periodontal infections; in fact, Hasturk and co-workers suggested that while the etiology of periodontitis is bacteria, the pathogenesis is inflammatory.
In other words, the interaction between the pathogenic bacteria and the host’s defence system could lead to the development of an inflammatory process.
Once periodontitis is established, the inflammatory infiltration of periodontal tissues is composed of different immunological cell types. These cells produce a large repertoire of specific types of cytokines and chemokines, which could play a significant role in the pathogenesis of periodontitis. Some of these, together with the end products of periodontal tissue destruction, could act as possible biomarkers and eventually could have diagnostic value by identifying patients with enhanced disease susceptibility and sites with active disease. They could also serve as surrogate end points for the monitoring of the patient treatment effects and treatment status, to tailor the maintenance care based on the biological needs of the subjects.
These biological mediators could support the clinical measurements already used in the routine diagnosis of periodontal diseases such as probing pocket depth, bleeding on probing, clinical attachment levels, plaque index and radiographs quantifying alveolar bone level. Nevertheless, they are often of limited usefulness because they are indicators of previous periodontal disease rather than the present disease activity. In addition, current periodontal examination procedures performed at single visit cannot determine whether or not sites are currently undergoing additional attachment loss.
As various immunopathogenic mechanisms are involved in the disease process of periodontitis, a combination of indicators is needed to improve the specificity of periodontal disease diagnosis. On the basis of the current understanding of the complexity of periodontitis, the identification of one single diagnostic marker for all forms of periodontal disease seems illusionary.
Nevertheless, researchers have been searching actively for unequivocal markers of periodontitis in different biological sources such as blood or serum, subgingival plaque sample, gingival crevicular fluid (GCF) and saliva to develop a simple test, to be used as chairside test or home-use device, to determine whether a patient suffers from periodontitis and needs therapy, as opposed to another patient who needs no intervention even though he/she has gingivitis and/or to establish a “custom-made” frequency of recall appointments.
The aim of this literature review is to summarise data from the literature on periodontal disease markers with special focus on saliva.
Saliva is a mirror of the body that contains a large number of proteins and peptides that are responsible for maintaining the integrity of the oral cavity (see table opposite page).
Saliva also meets the demand for inexpensive and easy-to-use diagnostic aids due to the non-invasive and simple nature of its collection. It can be collected with or without stimulation. The collection of gland specific saliva (from parotid, submandibular and sublingual gland) can allow differences in the amount of fluid and constituents of each gland to be determined. Differently, whole saliva consists of a mixture of oral fluids, and includes secretions of the major and minor salivary glands and constituents of non-salivary origin, such as derivates from GCF, serum and blood cells in case of bleeding gingiva or oral wounds, and expectorated bronchial secretions. It might also contain bacteria, bacterial products, viruses, fungi, desquamated epithelial cells and food debris.
The use of saliva for diagnosis of periodontal disease activity has been the subject of considerable research activity; in fact, it contains locally and systemically derived markers of periodontitis, thus offering the basis for a specific test. Several potential markers have been investigated to produce an assay system suitable for use in dental practices.
The main candidates in the search for biomarkers of periodontal disease activity fall into different general categories:
Inflammatory and immune products
While the bacterial infection triggers the destructive process, the host immune response to the bacterial challenge is responsible for the molecular processes leading to periodontal tissue destruction. The interaction between the pathogenic bacteria and their (toxic) components and the host defence system could lead to the development of periodontal pockets, loss of connective tissue, and bone resorption. Once periodontitis is established, the inflammatory infiltration is composed of different cell types, such as neutrophils, T and B lymphocytes, and macrophages migrating into the perivascular connective tissue.
The substances released by the inflammatory immune cells as well as by resident fibroblasts endothelial cells and others during the disease process include a large repertoire of molecules, such as antibodies, complement proteins, acute phase proteins and a broad range of inflammatory mediators (i.e. cytokines, chemokines, arachidonic acid metabolites etc.).
A recent investigation found that salivary level of MIP-1α was significantly correlated with Aggregatibacter actinomycetemcomitans positive students who developed periodontal disease six to nine months before radiographic detection of bone loss. MIP-1α level was also significantly associated with increasing probing depth and the number of pockets > 6mm (Fine et al. 2009).
Non-enzymatic proteins have been examined in a number of studies to investigate whether or not there was a relation between periodontal disease and these proteins in saliva. For example, platelet-activating factor (PAF), a potent phospholipid inflammatory mediator, was identified in the mixed saliva of subjects with periodontal disease. Salivary PAF levels have been found to be significantly higher in untreated chronic periodontitis patients compared to controls (Garito et al. 1995). Its levels correlate with clinical indices of disease severity and extent of the disease. Furthermore, a longitudinal evaluation of the effect of periodontal therapy on salivary PAF levels in chronic adult periodontitis patients was studied and initial salivary PAF levels were found to be decreased following supragingival plaque control and further reduced following scaling and root planning (Rash et al. 1995).
Saliva contains also numerous enzymes that degrade proteins, proteoglycans, lipids and carbohydrates. Enzymes in saliva can originate from GCF, salivary glands, microorganisms, epithelial cells and polymorphonuclear leukocytes (PMNs). PMNs are an important cell type in host defense against periodontopathogenic bacteria. Their primary role of phagocytosis of microorganisms may promote local tissue destruction by the release of tissue-degrading enzymes. In fact, PMNs granules contain hydrolytic neutral enzymes, such as elestase, cathepsin B, cathepsin D, glucuronidase. Matrix metalloproteinases (MMPs), peroxidase, lysozyme, lactoferrin, and many other enzymes are also sheltered in PMNs granules. Some of these are now discussed below.
MMPs represent a neutrophil granule content, which are involved in many biological processes, including the tissue destruction in periodontitis. MMPs degrade mostly components of the extracellular matrix (ECM) and many non-ECM molecules. The major MMPs in neutrophils are MMP-8 and -9 and these are the main collagen-degrading enzymes in saliva. Since MMPs can potentially cause tissue damage, their activity is controlled by four members of the tissue inhibitor of metallo-proteinase family (TIMP). The presence of MMPs in saliva has been studied comprehensively with ELISA techniques. The levels of MMP-1, -3, -8 and -9 and their endogenous inhibitor, TIMP-1, in saliva of patients with adult periodontitis were compared to localised juvenile periodontitis and controls. Both MMP-1 and TIMP-1 were detected in all studied saliva samples, but interestingly no significant differences were detected between adult periodontitis and healthy control groups (Ingman et al. 1996).
PMNs and macrophages produce reactive oxygen species (ROS) within their phagolysosomes and these may spill over into the tissues during phagocytosis or when they degenerate. This may cause bystander tissue damage around these cells. ROS have a great capacity to damage cells and tissues and are scavenged for within the tissues by antioxidants.
The antioxidant capacity of saliva has been investigated in healthy and chronic periodontitis patients. The major aqueous antioxidant component of whole saliva was found to be uric acid with lesser contributions from ascorbic acid and albumin. Using biochemical methods, the antioxidant capacity of the saliva was not found to be compromised in chronic periodontitis patients, and this was attributed to increased salivary flow and antioxidant flow from GCF.
Another research group investigated pheripheral (serum) and local (saliva) total antioxidant (TAO) capacities of chronic periodontitis and healthy patients using an enhanced chemiluminescent assay (Chapple et al. 1997). There were no differences in the serum TAO capacities but the salivary TAO capacities were significantly lower in the chronic periodontitis group compared with the healthy group. Thus the saliva of chronic periodontitis patients may have reduced TAO capacity, which could result from increased ROS production by inflammatory cells. The enhanced chemiluminescent assay provides a rapid simple method of measuring the total antioxidant defense in small volumes of biological fluid and hence could have diagnostic use. More work on its relationship to the progression of periodontal disease, and its capacity as biomarker needs to be done before this could be properly assessed.
Another enzymatic category, which has received the attention of periodontal researchers, is represented by enzymes released by dead cells (cytosolic enzymes). Aspartate amino transferase (AST) and lactate dehydrogenase (LHD) are soluble cytoplasmic enzymes that are confined to the cell cytoplasmic enzymes, and they can be released by dead or dying cells. Since cell death is an integral and essential component of periodontal tissue destruction, these enzymes should be released during this process and should pass with the inflammatory exudates into GCF and saliva.
While we do not have relevant studies on AST in saliva, a recent report demonstrated an increased LDH salivary activity in association with periodontal disease, specifically with the presence of calculus and pockets greater than 5mm (de La Peña et al. 2007). Clearly these markers are yet to be further investigated for their potential as salivary biomarkers for periodontitis.
Of the potential markers, PMNs-derived enzymes appear to be worthy of further study. The concentrations of host-derived elastase, chitinase and -glucuronidase are increased in patients with periodontitis and decrease following therapy (Lamster et al. 2003).
However, at the present state of knowledge, their salivary levels are not predictive of disease activity, which is the basic requirement of a diagnostic test.
Dr Fabiano Galassi D.D.S. M.Sc. (ACTA) Periodontology and Implant Dentistry. Practice limited to periodontology and implant dentistry. He received his Dental Degree from “La Sapienza” University of Rome. After two years general practice, he moved to Dublin where he continued working as a general practitioner until 2008.
Dr Galassi graduated with Honours from the MSc programme in Periodontology and Implant Dentistry at the Academic Center for Dentistry in Amsterdam (ACTA), in 2011. Has great interest in dental research, and he has published in peer-reviewed journals and written some chapters for periodontology textbooks.
As a member of the European Federation of Periodontology (EFP) and the Italian Federation of Periodontology (SIdP) Dr Galassi is now working at the Seapoint Clinic and Gleville Dental and his focus is on the treatment of periodontal disease, bone regeneration, cosmetic periodontal plastic surgery and implant dentistry.
Chapple, I.L., Mason, G.I., Garner, I., Matthews, J.B., Thorpe, H.G., Maxwell, S.R., & Whitehead, T.P. (1997). Enhanced chemiluminescent assay for measuring the antioxidant capacity serum, saliva, and crevicular fluid. Annals of Clinical Biochemistry 34, 412-421.
Patients suitable to undergo conscious sedation (CS) include those with moderate-severe anxiety, a swallow/gag reflex or a mild learning/physical disability such as cerebral palsy. Well-controlled medical conditions such as asthma, epilepsy, gastro-oesophageal reflux and mild hypertension are exacerbated by stress, making CS hugely beneficial. 1
Hospital-based intravenous (IV) CS helps patients with severe systemic disease or disability to avoid unnecessary general anaesthesia (GA). However, a small percentage of patients will still simply not tolerate dental treatment without being ‘knocked out’, making GA essential to facilitate dental treatment.
An in-depth medical, dental and social history is mandatory at a visit before treatment. It is important to ascertain the patient’s degree of dental anxiety. This helps determine the most suitable sedation technique as some patients with severe needle phobia are unable to tolerate cannulation making inhalation sedation the best option for them.2
Age is not an absolute contraindication to sedation but older patients are more sensitive
to sedatives.4 The incidence of delirium following treatment with midazolam was 10 per cent higher in the elderly.5 Elderly patients also tend to have poorly tethered, friable veins, which may be more susceptible to cannulation damage. IV sedative agents in children <12 is not recommended unless provided by a paediatric specialist. Disinhibition in adolescents is common and even slight over-sedation can lead to rapidly deteriorating respiratory depression.6
There should be no elective surgery if the diastolic value is >110 mmHg. However, when measuring blood pressure always consider the risk of “white coat hypertension”.
Patients with controlled/uncontrolled hypertension have a more labile haemodynamic profile during CS making hypotensive swings more likely.7
It has been shown that there is little evidence that a BP < 180mmHg/110mmHg causes perioperative complications. However, a BP>180/110mmHg is linked to perioperative ischaemia, arrhythmias and cardiovascular lability. There is no clear evidence that deferring anesthesia lowers perioperative risk. The intraoperative BP should be within 20 per cent of best BP estimate.8
Dentists must evaluate pre-operatively for the presence of target organ damage such as coronary artery disease. Target organ damage lowers the treatment thresholds for raised BP.9
A study examining the cardiovascular effects of epinephrine with IV midazolam examined 75 patients with heart disease treated in two groups.The rate-pressure product (RPP) was used to indicate myocardial ischemia. This is the systolic BP x heart rate = RPP, which is a reliable indicator of myocardial oxygen consumption. Ischemic changes were demonstrated in patients with an RPP of >12,000, increasing their CS risk. The pressure rate quotient, which is mean BP divided by heart rate, also assesses a patient’s suitability for CS. The results of this study indicated that treatment with midazolam and epinephrine does not generate significant ischemic risk. It is important that the lowest effective dose of local anaesthetic containing epinephrine is used and that intravascular injections are avoided.10
ASA According to Blood Pressure (BP):
|<140 systolic and <90 diastolic||ASA I||Primary care suitable|
|140-160/90-94mmHg||ASA II||Primary care suitable|
|160-199/95-115mmHg||ASA III||Specialist unit|
|200 systolic and >115 diastolic||ASA IV||In-patient services|
1 No hindrance to normal physical exertion
2 Slight limitation, angina with fast walking, ascending stairs, excitement
3 Significant limitation of regular movement. Angina on climbing a normal staircase
4 Angina with minimal activity/rest.
Increased stress levels exacerbate angina, making sedation and good local anaesthesia important in reducing heart rate. Unstable angina contraindicates elective treatment. Patients with angina that affects normal daily activity such as NYHA 3 are unsuitable for sedation in primary care. If the GP/cardiologist confirms stability of angina then NYHA 2 patients can progress with elective sedation.11
At six months post-infarctiona patient is classed as ASA 3. The risk of re-infarction is 16 per cent. Elective sedation in well-controlled patients reduces stress, helping to lower risk.
Patients must wait three months after stenting before elective sedation. Angina must always be successfully controlled before treatment.1
Patients with benign palpitations benefit from the stress reduction produced by CS. A patient with malignant palpitations, however, must be treated in hospital. Any individual with an automated implantable cardioverter-defibrillator is unsuitable for treatment in primary care. A hospital setting is mandatory for patients with a pacemaker or those following AV node/conduction pathway ablation surgery. Wolff-Parkinson-White syndrome is an absolute contraindication to sedation.1
Midazolam has a greater effect on the respiratory system compared to the cardiovascular system. Healthy patients who present with respiratory infections on the day of treatment should be rescheduled. Careful assessment of the patient’s disease and functional reserve will indicate the most suitable setting for CS. It must be remembered that opioids act synergistically with sedation with regards to respiratory depression.12
1 Mild dyspnoea
2 Moderate – limited outdoor movement – hospital management safest
3 Marked dyspnoea on minimal exertion indoors – unsuitable for outpatient sedation
4 Dyspnoea while resting – unsuitable for outpatient sedation.
The dentist must ensure the asthmatic is well controlled. A mild asthmatic is considered ASA 2; however, an untreated Grade 2 is unsuitable for treatment in primary care. Hospital management is necessary for ASA 3 patients who have frequent episodes/attacks. It must be borne in mind that theophylline can interact unfavourably with IV midazolam. Inhalation sedation can be a safer option due to guaranteed oxygen levels.13
Extreme caution is needed with COPD patients who suffer with emphysema or bronchitis. A patient with chronic bronchitis is ASA 3. Midazolam results in dose-related respiratory depression, which is more exaggerated in COPD patients. Hospital treatment of the patient in an upright position with supplemental oxygen is required due to the increased risk of hypoxia.
If a patient needs supplemental oxygen at home or has severe orthopnoea or a productive cough then sedation is contraindicated.12
Hepatic microsomal oxidation is responsible for midazolam’s biotransformation. This is susceptible to factors such as old age, hepatic cirrhosis and drugs (cimetidine) as they reduce the oxidative capacity. A high regular intake of alcohol increases midazolam clearance.
Renal failure causes a build-up of metabolites which prolongs sedation. CS is contraindicated in cases of advanced liver disease.1
Patients undergoing haemodialysis or continuous ambulatory peritoneal dialysis are unsuitable for sedation.
Haemodialysis patients swing from being centrally underfilled where they are at risk of hypotension to centrally overfilled. Day 2 is considered the safest time to treat but outpatient CS is still best avoided. Post-renal transplant patients with good renal function may be suitable for hospital-based CS.11
Methadone and midazolam are both metabolised by the cytochrome P450 3A pathway. Chronic methadone use leads to the induction of this pathway with more rapid midazolam metabolism and higher dosage requirements.14
IV midazolam helps to reduce involuntary movement in patients with multiple sclerosis and Parkinson’s disease making dental treatment more comfortable. Many patients will have reduced swallowing capacity so sitting the patient upright with adequate suction is vital. Controlled epileptics are suitable for CS although more research is needed to develop clearer guidelines. Liaising with the GP/neurologist confirms if the patient has a driving licence and when the last three seizures occurred. Anti-epileptic drugs such as phenytoin can increase or decrease plasma concentration of sedatives.11
Recovered stroke victims may experience a re-emergence of symptoms when benzodiazepines are administered. Light sedation can trigger a re-occurrence of symptoms such as right-sided paralysis and dysphasia. Sedation is contraindicated for one year after a stroke.15
Sedation should be avoided in patients with sickle cell anaemia and thalassaemia. This cohort are high risk for reduced oxygen tension with respiratory depression or over-sedation. Inhalation sedation is preferred.16
The second trimester is the safest time to treat, but the mother’s metabolism is altered due to the increased demands of the baby. This makes sedation unpredictable. There are also foetal teratogenic risks.12
Patients with mild learning disabilities are suitable for sedation. Severe learning or physical difficulties require management by an anaesthetist-led team.17
HbA1c helps identify pre-diabetic patients. It also helps recognise diabetics at risk of complications. A BM check of >5mmol/l pre-treatment is advisable.18
Pre-operative starvation can upset blood sugar levels. The evidence for fasting is low so a degree of clinical judgement required.19 Well-controlled diabetics are best treated in the morning to avoid interference with their insulin routine. Poorly controlled diabetics requires hospital management. Inhalation sedation can be a safer option as it is easily reversible.16
Patients on long-term steroids must be treated in an anaesthetist-led facility to avoid an adrenal crisis.13
Hyperthyroidism can cause tachycardia and atrial fibrillation. Hypothyroidism can cause bradycardia, making CS unpredictable.12
Cardiac medication: Ace inhibitors, beta blockers, calcium channel blockers and nitrates enhance the hypotensive effect of midazolam20
Erythromycin effects metabolism of midazolam21
Midazolam interacts with herbal medicine potentiating CNS depression22
Opioids such as heroin can cause significant respiratory depression with midazolam. Veins are often unusable1
Cocaine adversely effects respiratory/cardiovascular control with sedation1
Cannabis makes oxygen saturation levels unpredictable during sedation1
Central nervous system depressants for mental health conditions can act synergistically with benzodiazepines. Tolerance may have developed in these patients similar to recreational drug users.20
Blood pressure, oxygen saturation, BMI, heart and respiratory rate must provide a satisfactory baseline indicating fitness for sedation. Sometimes a screening may reveal an unknown condition requiring further investigation by a GP before sedation can be performed.16 It is important to predict a patient’s risk for conscious sedation. Hospital-based sedation is advisable in the following instances:
Patients with a history of more than one attempt for previous intubation.23
A patient with a BMI of <35kg/m2 is suitable for primary care CS. Caution is advised with a BMI of 35-40kg/m2 especially if the patient has co-morbidities such as hypertension and diabetes.
The standard dental chair has an upper weight limit of 140kg making referral to hospital sometimes necessary for the use of a DIACO chair which can hold 500kg. Successful cannulation can be difficult due to the effects of increased adipose tissue on vein morphology.24
Sleep apnoea is more common in individuals with a BMI of >35. Sedation is an absolute contraindication in patients with obstructive sleep apnoea(OSA). The pharyngeal airway dilator muscles are highly sensitive to benzodiazepines.25 The STOP-BANG questionnaire is a useful screening tool for identifying potential cases of OSA.26
This is a visual assessment of the distance from the base of the tongue to the soft palate. A Class 3 or 4 patient is at increased risk of airway obstruction. The patient must be asked to protrude their tongue. It is important to document the level of visibility of the back of the mouth.27
A difficult airway can also be judged if the thyromental distance is <6.5cm. A short, fat neck and receding jaw is an airway risk. Males are more susceptible to airway obstruction.28
IS can be used from the age of three. 29 Patients who are allergic to benzodiazepines or those tolerant to them due to treatment for anxiety/insomnia are suitable for IS. In patients previously addicted to benzodiazepines IV, CS can reactivate dependence making inhalation sedation safer.30
IV sedation suits mouth-breathers, anyone taking methotrexate due to the anti-folate effects of IS and also someone who had vitreoretinal surgery within 12 weeks. Severe autism or ADHD patients are unsuitable for IS due to compliance difficulties. A hearing impediment reduces the hypnotic suggestion aspect of IS treatment making CS more effective.16
If titratable techniques are deemed inappropriate then oral or intranasal sedation may be considered. Special care dental patients with challenging behaviour benefit greatly from these advanced techniques.31
A treatment plan is devised by combining the information gathered during history-taking and the clinical exam. The patient must be of sound mind to give their valid written consent at a visit separate to treatment. If needed, the presence of a responsible adult escort must be possible.32 Careful consideration regarding the nature of the patient’s disease and functional capacity is essential. The dentist has a duty of care to predict patients at risk of complications with CS such as cardiac, respiratory or neurological deterioration. After risk stratification, the optimum timing and setting for treatment must be decided to ensure patient safety.
There will always be a place in dentistry for general anaesthesia, especially for treatment plans involving extensive work on multiple teeth that make multiple sedation visits impractical and overall more expensive. Also in certain sedation cases, patients can move unpredictably, compromising the quality of the dentistry performed, which may necessitate the use of general anaesthesia.
Dr Laura Fee graduated with an honours degree in dentistry from Trinity College, Dublin, where she was awarded the Costello medal for undergraduate research on cross-infection control procedures. She is a member of the Faculty of Dentistry at the Royal College of Surgeons. She has a Certificate in Implant Dentistry from Northumberland Institute of Oral Medicine and has been awarded the Diploma in Implant Dentistry with the Royal College of Surgeons Edinburgh.
In the first article, we explored how to establish a research question using the PICO (Population, Intervention, Comparator and Outcome) method and discussed the hierarchy of evidence. At this point in the search for evidence to support our practice, we know the question we need answered and also understand how different types of research can help to answer our questions.
We now need to think about where to find the evidence and how to assess the quality of what we find.
First let’s revisit the five steps to an evidence-based approach.
This article will explore points 2 and 3 of establishing an evidence-based approach to healthcare.
There are a number of databases that can be used to find the evidence. Which database you choose to search depends on what type of resource or evidence you require. In this section, we will introduce and explore the use of databases that host most of the information required in day-to-day practice. Three of the most commonly used databases are included in Table 1.
There are other databases available for searches of more specific topics that can be accessed through the knowledge network; for example, PsychINFO is a good database to search for psychology and behavioural science-related topics. You can see the full list of databases on offer here: www.knowledge.scot.nhs.uk
|Database||Type of evidence||Key features|
|PubMed||Systematic Reviews, Primary Research||Ability to create an account and save search results for later use|
|Cochrane Library||Systematic Reviews||Includes plain language summaries of reviews; useful for translating evidence for use at chair side|
|TRIP||Guidelines, Systematic Reviews, Primary Research||Displays results in the style of hierarchy of evidence, reducing search time|
It is always a good idea to start your search for evidence at the top of the evidence pyramid. As we discussed previously, systematic reviews and randomised control trials are the level of evidence we would require in order to think about changing our practice. At the end of our first article, we briefly discussed guidance documents. The guidance produced by SDCEP, NICE and SIGN are all evidence-based and the groups will have come to their recommendations after a thorough process.
Dr Doug Stirling is Programme Manager of the Guidance Development Group, Scottish Dental Clinical Effectiveness Programme, NHS Education for Scotland. Here he tells us more about the work of the SDCEP team and the methods they use.
The SDCEP team operates within NHS Education for Scotland’s Dental Directorate. Each guidance project is assigned an SDCEP project lead, who manages the project and is responsible for the methodology employed, and an administrator who helps to co-ordinate the project. For each project we also convene a Guidance Development Group comprising external individuals who are representatives of groups with a particular interest in the topic. Typically this will include various relevant branches of the dental profession and patients, and may also include other healthcare discipline relevant to the topic.
Each guidance project aims to answer a number of questions. SDCEP identifies the latest evidence that is relevant to these questions, focusing on systematic reviews and other evidence-based guidelines. To assess the quality of evidence in systematic reviews, SDCEP now uses GRADE (Grading of Recommendations, Assessment, Development and Evaluation), which is a widely accepted system for grading both evidence and recommendations in clinical guidelines. More information on the GRADE system can be found at www.gradeworkinggroup.org
We appraise guidelines using the AGREE II checklist, again an internationally recognised tool for assessing guideline quality and reliability. Find out more at www.agreetrust.org
Recommendations in SDCEP guidance result from a rigorous consideration of not only relevant research evidence, but also other factors, including, the balance of risks and benefits, patient’s views and preferences, practitioner perspectives and the practicalities.
The process SDCEP uses to develop its guidance has now been accredited by NICE (the National Institute for Health and Care Excellence), which should give users added confidence in the reliability of the guidance as an aid to their decision-making.
The vast majority of dental care is delivered in primary care practice. Recognising this, most SDCEP guidance is primarily directed towards dentists and their teams working in general dental practice. However, the guidance is also likely to be of interest to those in training, dental educators, and secondary care and public health practitioners.
Healthcare staff have the right, and indeed the duty, to make decisions that are in the best interests of their patients with their consent. SDCEP guidance is provided to inform some of these decisions. There is no obligation to follow a recommendation in the guidance if a health professional feels that it is in the best interests of an individual patient not to do so.
However, it would be advisable to document a departure from recommended practice in the patient’s clinical notes, including the reason for this.
Further information about SDCEP guidance development: www.sdcep.org.uk/how-we-work/ or to find out more about GRADE
TRIP (Translating Research Into Practice) is a useful resource for searching for the results of systematic reviews, randomised controlled trials and guidelines. You might think of it as a high-quality Google for health-care research. It is an online database that has a few very useful search tools. You can do a single-word search, which is similar to a Google search, but you can be more specific and use the search function established around a PICO question. Shown in Figure 1 below. The database displays results and categorises the level of evidence in a hierarchy. It is similar to the hierarchy of evidence discussed in the first article. This makes it easy to identify what type of evidence the study is before you spend time reading it.
TRIP will also produce results from primary research but another useful database that you should understand how to use is PubMed.
PubMed is a search engine that searches the online database MEDLINE. It includes more than 27 million records. Here you will find a range of evidence. As we demonstrated in the first article, the results can be confusing at first and the searches can result in a lot of irrelevant material. We will discuss how best to use the search function later but will first look at the fundamentals of searching scientific databases.
PubMed can be accessed by typing ‘pubmed’ into any search engine or by visiting www.ncbi.nlm.nih.gov/pubmed
Having a systematic approach to your search will make finding relevant papers a lot easier and quicker. Most of the pointers demonstrated in this section can be broadly applied in other online searches.
You could decide to free text the search tab as you might use a search engine such as Google. This approach can often result in a large amount of unfiltered results, similar to a search for a hotel room without any information on location, standard or length of stay.
If you know the title of the exact paper you are looking for, then you could simply type this into the search box at the top of the page. You can tailor the search; for example, if you only have some of the information about a specific paper, such as the author.
A better way to search, and the best way to get the most out of the search engines, is to use Boolean search methods.
This approach still uses free text in the search but introduces AND, OR and NOT. The AND, OR and NOT are known as Boolean connectors. They all have specific functions and can help to widen or narrow your search.
Let’s use our example in article 1 to explore the Boolean connectors. Our original question was about whether or not fluoride varnish has an effect on caries rate in children. The formulation of a PICO question resulted in this:
To construct a search for Pubmed we could use the following:
This would produce results from papers that contain all three search terms. This is a method for narrowing a search.
You may also have noticed that the words “fluoride varnish” have speech marks either side of them. This is another useful way of narrowing a search for a specific phrase. The speech marks instruct the search engine to only include studies that have the entire phrase. If we had searched without the speech marks then we would have papers returned that include fluoride as a standalone word from varnish and not specific to our question
Using OR can help to widen a search. For example, if we were interested in fluoride treatments other than fluoride varnish we might search the following:
This would produce results from papers that contain all our original three search terms but also include studies that look at fluoride mouthwash. Again, note the use of the speech marks to search for the entire phrase.
Truncation is useful when you want to expand a search. An example might be in periodontics. By using the trunk of the word Periodont and then adding * to the end will return results for Periodontist, Periodontal, etc.
A more advanced way of searching the database is to use controlled language searches. MEDLINE uses Medical Subject Heading, known as MeSH. Those studying for higher level degrees may wish to use this method in their searches. Speaking to the university librarian or doing a short course would be the best way to learn more on this topic. A useful tip about PubMed is that you can register for a free account and save your searches as you go. You can also access the free online tutorials that will help you understand how to get the most out of the database.
Guidelines produced in the UK by groups such as SDCEP, SIGN and NICE are free and open access. They are readily available online. The Cochrane library is also free and open access in the UK and other countries who contribute to it, while it is also available in some developing countries. Some journal articles may be free but most will be only be available through subscription to the journal itself or via an institution of which you are a member.
All NHS employees are entitled to free registration on OpenAthens, which will give you access to The Knowledge Network that is maintained by NHS Education for Scotland. That includes general dental practitioners with an NHS contract. It is a gateway platform to accessing full text articles. If you register then you can access most articles that are returned in searches on PubMed; then you simply enter you username and password once the pay wall appears.
You can register at the address here: www.athensregistration.scot.nhs.uk
If you are a member of a royal college then you have an entire library service at your disposal. Royal colleges offer members the services of a librarian who can help with literature searches and also source books that may be relevant to your search. Be sure to explore this service that is part of your membership subscription.
Many specialist societies have subscription services for their members. The BDA also has an extensive library and journal service for use by members which can be accessed remotely through their website.
Not every article published in a journal is a game changer. Sometimes this is easy to spot when reading an article, but other times it may be less clear as authors try to convince you about their work. Understanding the hierarchy of evidence and having some basic skills in critical appraisal will help you when trying to decide how seriously to take a new recommendation or proposed change in practice. Having critical appraisal skills can have wide-reaching benefits beyond the surgery.
At this point, we have defined our search question and found the papers we think are relevant. We know about the hierarchy of evidence, but how do we decide which ones to use? Do they all meet the same standard? Are the results valid? Do they apply to the patients I see on a day-to-day basis? Do the results include the negative outcomes of the treatment?
These questions are important to consider, how we act on the evidence will affect our patients.
Using a systematic approach to appraising the evidence in front of you is always the best way. There are a range of appraisal tools available and some are available for free download from the Centre of Evidence-based Dentistry website: www.cebd.org
The best way to understand critical appraisal is to practice it. If you are brand new to it, then there are a number of ways you can get help to get started. This could be by attending face-to-face or online courses, reading a book or attending a journal club.
Terry Shaneyfelt is a teacher of evidence-based medicine; he has produced a number of YouTube videos that are useful when trying to get your head around critical appraisal. Simply search YouTube for ‘Terry Shaneyfelt’ and click on his playlists where you will see the critical appraisal section.
If you wanted to spend some time and do an online e-module then you can access one provided by the Critical Appraisal Company. There is a cost associated and the course takes six to eight hours, but it gets good reviews.
Most dentists in core or specialist training will have access to a journal club in their place of work. If there isn’t one, why not take the lead and get one started over a lunchtime once a month? There are other journal clubs that anyone can attend, such as the Edinburgh Dental Journal club that meets regularly at the Royal College of Surgeons of Edinburgh. Search for them on Facebook© to find out when the next meeting is.
Hopefully, after reading these first two articles you now have a basic understanding of the skills needed to practice evidence-based dentistry. We have introduced you to a range of resources that can help you to further develop your skill and knowledge. The best way to get better at using databases for searching and critical appraisal is to get on and do it. Look out for your local journal club or go online and make the most of the many free resources there are to hand.
The next and final article will focus on applying the evidence and evaluating outcomes in your practice.
Neil is a specialty registrar in dental public health and is currently studying for his masters of dental public health at the University of Dundee. He graduated from Dundee Dental School in 2013 and then went onto complete longitudinal dental foundation training and dental core training in a range of specialities in Scotland including a placement with the SDCEP. He is a co-founder of the Scottish Charity, Let’s Talk About Mouth Cancer that is focused on the early detection of mouth cancer. He has received multiple awards for his work both inside and out of the NHS. Most recently, he received a National Award, NHS Young Achiever, from NHS Scotland and Scottish Government.
Derek is a consultant in dental public health, editor of the Evidence-based Dentistry Journal and director of the Centre for Evidence-based Dentistry now based at the Dental Health Service Research Unit in Dundee. He holds honorary senior lectureships at Dundee and Glasgow Dental Schools and is a specialist advisor to the Scottish Dental Clinical Effectiveness Programme (SDCEP). He has been involved with a wide range of evidence-based initiatives both nationally and internationally since 1994. He is a co-author of the book, Evidence-Based Dentistry: Managing Information for Better Practice (Quintessential of Dental Practice) and the chief blogger for the Dental Elf website.
Derek Richards, Jan Clarkson, Debora Matthews, Rick Niederman. Evidence-based Dentistry: managing Information for Better Practice. London: Quintessence Publishing; 2008
Jan Clarkson, Jayne E Harrison, Amid I Ismail, Ian Needleman, Helen Worthington. Evidence Based Dentistry For Effective Practice. London: Martin Dunitz; 2003
|Database||Type of evidence||Key feature|
|PubMed||Systematic Reviews, Primary Research||Ability to create an account and save search results for later use|
|Cochrane Library||Systematic Reviews||Includes plain language summaries of reviews; useful for translating evidence for use at chair side|
|TRIP||Guidelines, Systematic Reviews, Primary Research||Displays results in the style of the hierarchy of evidence, reducing search time|
FIGURE 1: A screenshot of the PICO input section on TRIP. It can be accessed by typing TRIP database into any search engine or via www.tripdatabase.com
A new patient in her early 30s attended for a check-up. A routine radiograph revealed caries under the amalgam filling on the upper right second premolar (UR5). When advised the tooth needed treatment, the patient revealed she had been unhappy with how it looked. The filling was very visible and shiny when she smiled. The dark appearance of the tooth also made her self-conscious. The patient had thought treatment would be long and expensive, so she hadn’t bothered to ask.
The options were to have another amalgam filling or a composite restoration. The patient was advised that further composite treatment could be needed buccally to mask any remaining grey discolouration, if she was not satisfied with the outcome. As she was concerned about the appearance of the tooth, the patient did not want an amalgam filling and decided to have the composite restoration.
After a local anaesthetic was given, rubber dam was placed, with a clamp on the UR6, exposing the UR 4, 5 and 6. This was secured in place with floss ties. The old amalgam and caries were removed. The final portion of discoloured dentine was left behind as it was very deep, but the pulp was not exposed and it was still firm.
A sectional matrix band was then positioned mesially on the UR5, with a wedge and separation ring (V-ring). Initially, the enamel periphery alone was etched with 37 per cent phosphoric acid for 15 seconds. Etch was applied to the rest of the cavity for a further 15 seconds, before rinsing. A cotton pledget was used to protect the dentine during the drying process, to ensure dry enamel and moist dentine.
A two-bottle adhesive, with separate primer and adhesive, was used to complete the preparation. The dentine was primed and left for 30 seconds. The adhesive was placed on both the enamel and dentine, and allowed to sit for
30 seconds before curing.
In this case, Venus Pearl composite was used. This material exhibits good levels of opacity to block out discolouration and excellent handling for posteriors, making it a very easy-to-use product.
In this restoration, a small amount of Venus Flow base liner was placed and cured. This was to mask the greyness and dark discolouration from the base of the cavity. Next a thin layer of Venus Pearl A2 shade was applied to build up the mesial wall against the matrix. The height was built up to the level of the adjacent marginal ridge. The material was then manipulated with a sharp probe at a 45 degree angle. This ensured the edge of the wall was not straight and the natural curved shape of the marginal ridge was maintained. The dentine mass was built up in increments with Venus Pearl ODC shade.
Enamel A2 shade was placed over the occlusal surfaces cusp by cusp. Complete separation of the masses was achieved by creating fissures down to the dentine layer, using a sharp probe. Secondary anatomy was manipulated into the unset material before light curing.
A mix of Venus Color ‘corn’ and ‘choco’ stains was applied to the fissures using a probe, and pressed in with a long- bristle brush. The excess was wiped away with a conventional micro-brush and the stain was cured. Highlights were placed on the ridges using Venus Color ‘white’ mixed with a little ‘corn’, to give a milky colour. Final adjustments were carried out before rough, dry polishing. The restoration was then sealed with a protective clear coating, covered with glycerine and cured.
In this case, the clinical outcome was good. The tooth is regularly monitored for vitality and the patient has had no problems with it. As the caries was so deep, in the long term the tooth may require root canal treatment, but it is currently sound. The patient was delighted with the result after having endured an unsightly amalgam filling for years.
FIGURE 1: A routine X-ray revealed caries under the amalgam filling in the upper right 5
FIGURE 2: The UR5 filling was very visible when she smiled and the dark appearance made her self-conscious
FIGURE 3: The old amalgam and caries were removed following rubber dam placement
FIGURE 4: Kulzer Venus Pearl A2 shade was applied to build up the mesial wall
FIGURE 5: Separation of the masses was achieved by creating fissures down to the dentine layer and then stain was applied
FIGURE 6: The patient was delighted with the result after having endured an unsightly amalgam filling for years
About the author
Dr Monik Vasant BChD MSc is a highly experienced clinician with a special interest in minimally invasive aesthetic dentistry. He has trained under many of the world’s leading clinicians and has an MSc in aesthetic and restorative dentistry.
He is the director of Freshdental,with sites in Central London and Greater Manchester.
Monik lectures globally on minimally invasive and adhesive dentistry. His highly regarded direct composite course “Totally composite” is held throughout the UK and internationally. He also runs a year long minimally invasive aesthetic dentistry course entitled ‘Totally Aesthetics’.
Monik is a global key opinion leader for several dental companies and has co-authored several books on various aspects of general practice.
Contact email@example.com or for course information and bookings, visit www.monikvasant.co.uk
Follow Monik on Instagram @drmonik
Monik is the keynote speaker at the Scottish Dental Show 2018, to be held at Braehead Arena on 27 and 28 April. He will be presenting two lectures on Friday 27 April, ‘Composite artistry’ and ‘Composites and digital dentistry’.
To find out more and to register for your FREE delegate pass that will get you access to 140 exhibition stands and more than 50 lecture and workshops sessions, with up to NINE hours of vCPD, visit www.sdshow.co.uk
Mrs M attends her dentist, Mr A, complaining of pain in an upper tooth. They discuss treatment options and she agrees to undergo private treatment, including root filling and the fitting of a new crown. She signs a treatment plan which shows the cost of the work will amount to around £500.
The treatment is carried out without incident and Mrs M pays part of the bill before leaving that day. The practice sends out an account detailing the remaining total but, three months later, no further payments have been made. Mr A issues another written account to Mrs M but is then contacted by Mr M who says he is assuming responsibility, with his wife’s consent, for the bill. He asks why the cost is so high but Mr A explains the treatment given and that the price was agreed in advance.
Five months after the initial appointment, still no further payment has been made. Mr A phones Mr M at home to discuss the matter. There is no answer but the phone switches to an answering machine, identified as belonging to Mr and Mrs M. He leaves a message asking Mr M to contact the practice about the unpaid bill.
One week later, Mr A receives a cheque for £150 from Mr M along with a promise that more money will follow soon. It is also accompanied by a letter of complaint from Mr M who is angry that the dentist disclosed information about the unpaid bill in the answering machine message. His daughter had dropped by while he was out and heard it, causing him considerable embarrassment.
Mr A sends a written apology to Mr M and agrees to let him pay the bill off over the next two months.
A short time later, however, Mr A is notified by the General Dental Council that a complaint has been made against him alleging a breach of confidentiality and claiming the cost of treatment was unfair and had not been
Mr A calls MDDUS for advice. It is recommended he writes a further letter of apology to Mr M. Mr A accepts that sensitive information about the unpaid bill should not have been disclosed in the phone message and that practice procedures have been changed to avoid a repeat of this error. It is also advised that Mr A waives the outstanding sum owed to the practice in recognition of the distress caused by the confidentiality breach.
Regarding the disputed fee, Mr A is confident that this was fully discussed with the patient in advance and he has the treatment plan signed by Mrs M to support this.
The GDC case is eventually closed with no action taken against Mr A.
About the author
Aubrey Craig is head of dental division at MDDUS. For more information, go to www.mddus.com
Imaging is essential in endodontics. Traditionally, X-rays (radiographs) have been used and more recently cone beam computed tomography (CBCT) is used to give the clinician more detailed tooth information as part of a clinical examination.
Radiographs have been an invaluable tool in the dentist’s armamentarium in the diagnosis and management of dental problems, (Grondahl and Huumonen, 2004), since their introduction in 1865. Radiographs may be taken as single parallel images or two images applying the parallax technique. Radiographs fundamentally represent a two-dimensional representation of a three-dimensional spatial relationship. The shortcomings and limitations of radiographs are; a degree of magnification – 5 per cent or more (Voorde and Bjorndahl, 1969), superimposition, geometric distortion and lack standardization or reproducibility.
Aria et al 1999 and Mozzo et al, 1998 independently developed a new tomographic scanner known as CBCT and this was specifically for maxillofacial and dental use. CBCT (Fig 1) is a modern three-dimensional imaging system which produces high-quality images using relatively low doses of radiation (see Table 1).
TABLE 1: Comparisons of scans reproduced from Essentials of Dental Radiography and Radiology, 4th edition 2007
CBCT differs from ‘medical’ multi-slice CT (MSCT), as the whole volume of data is acquired in a single sweep with rotations varying between 180-360 degrees. The scanning time is reduced, typically 10-20 seconds, and radiation dose to the patient is less since the cone shaped (not fan shaped as MSCT) beam is pulsed, reducing exposure times to only 3.5 seconds. Approximately 580 images are produced and the field of view (FOV) can be as small as 40mm x 40mm, which can be useful in endodontics (SEDENTEXCT 2012) (Fig 2).
FIG 1: An Accuitomo small volume CBCT scanning machine (Image reproduced from J.Morita USA Inc)
Application of CBCT in endodontics
Limited volume (small FOV) CBCT scanners capture small volumes of data that can include just two or three individual teeth. CBCT allows the operator to view data in three planes: sagittal, axial and coronal (Fig 3). As all the information is obtained in a single rotation, it is very important that the patient is stationary throughout the exposure.
Spatial resolution is a drawback with CBCT since there is only approximately a tenth of the resolution that is currently available with digital and conventional radiographic films. “Increased resolution usually comes at the expense of an increased dose to the patient, as a result of longer exposure times to acquire more 2D projections to a more detailed reconstruction,” (Christiansen et al 2009).
Another limitation of CBCT scans are their vulnerability to beam hardening and streak artefact, which can reduce the image quality even further by producing dark bands or streaks in the image.
FIG 2: Basic concept of CBCT
FIG 3: CBCT image planes
Notwithstanding the above limitations, there are a number of applications for CBCT in endodontics which may overcome the limitations of conventional and digital radiographs and ultimately improve patient management. CBCT with a limited FOV may be considered in the below situations as recommended by the European Society of Endodontology (ESE) position statement 2014:
The use of CBCT in endodontics:
As stated by Rosen et al 2015: “A web-based survey emailed to 3,844 active members of the American Association of Endodontists in the United States and Canada reported a significant increase in the use of cone-beam computed tomographic (CBCT) imaging; 34.2 per cent of 1,369 respondents indicated that they were using CBCT imaging for diagnosis and treatment planning purposes,” (Dailey et al 2010).
Implications of CBCT in endodontics
There are a number of implications of CBCT in its application in endodontics, some of which have been discussed earlier, such as radiation dose and treatment outcome.
CBCT still uses ionising radiation and is not without risk. Radiation dose and ‘stochastic effects’ are important considerations. As discussed earlier, CBCT does expose patients to an increased radiation dosage. The principles of ‘As Low As Reasonably Achievable’ (ALARA) should always be applied to limit patient dose.
Every radiation exposure a patient has must be justified and optimised ideally with strict selection criteria as stated by the FGDP guidelines, 2013. The FOV must be reported on in its entirety since the clinician has a legal obligation to read and comment on the whole view. This highlights the training the operator must undergo before taking scans and the clinician must engage the advice of a suitably qualified radiologist if further advice/information is sought (Brown et al 2014).
The cost of CBCT scanners must not be allowed to motivate clinicians to take scans without first justifying the exposure. Ethical scanning is paramount.
Another implication may be the potential removal of metallic coronal restorations to avoid ‘beam hardening’, which would increase procedural time and patient cost.
Wu et al 2009 recommended that: “The outcome of root canal treatment should be re-evaluated in the long term using CBCT and stricter evaluation criteria”, for the reasons as discussed earlier. This has led many researchers to argue and debate a very crucial question: What constitutes endodontic success? An asymptomatic patient or a ‘healed’ scan or periapical?
“This has a huge implication on clinical decision making and selection criteria when considering (re-) placing coronal restorations on teeth which have previously been endodontically treated and appear to have successfully healed on the radiograph,” (FGDP 2013).
Some have asked for more clarification from the European Society of Endoontology (ESE), which has recently published a position statement: ‘The use of CBCT in Endodontics’, in 2014. The guidelines advise that “every image involving ionizing radiation, including CBCT, must be justified and optimised. A record of the justification process must
“Clinical studies with a primary outcome measure of detecting the presence or absence of apical periodontitis and epidemiological studies assessing the prevalence of apical periodontitis in different populations may have to be re-evaluated,” (Ng 2010).
The question, therefore, may be posed as to how much relevance a CBCT has in clinical decision-making in endodontics? If a clinician has not obtained enough relevant information from a radiograph and has made the clinical judgement to expose the patient to a CBCT scan, does the information provided by the CBCT image have an effect on the clinician’s clinical management of that patient? Does the exposure of the patient to a CBCT image have a net positive benefit to the patient? Is this justified following the guidelines discussed earlier?
The scoping searches showed a number of papers important to this review in the existing literature:
Scoping searches to formulate an idea of the current state of knowledge of the topic literature showed limited studies in this area. Studies that were found appear mainly to be in-vitro with few in vivo studies. This, of course, highlights the justification of performing in vivo studies in humans where ethical issues are paramount in the 21st century. Scoping searches were performed using the PROSPERO, PubMed and Google Scholar databases. Scoping searches also identified a number of well-published authors who appear to be leaders in the field of CBCT: S Patel, C Durack, F Abella, M Roig, H Shemesh, P Lambrechts and K Lemberg.
CBCT can overcome some of the limitations of intra-oral radiographs, which are the primary imaging method in endodontics (Lofthag-Hansen et al, 2007 and Scarfe et al, 2009).Therefore, the usefulness of CBCT imaging can no longer be disputed, since they can complement radiographs. It is an important imaging tool in contemporary endodontics and “has been shown to be superior to conventional periapical and panoramic radiography in its accuracy and sensitivity in detecting endodontic related pathology” (Stavropoulos and Wenzel, 2007, Tsai et al, 2012, Liang et al, 2014).
As scanners become more affordable and radiation dose to the patient possibly reducing, more endodontic disease may be detected in the future, which inevitably means better patient management. However, Pope et al 2014 have discussed that more sensitive technology may cause over-diagnosis, which could potentially harm
Presently, academic opinion (ESE position statement, 2014) advises that “CBCT should only be considered in situations where diagnostic information from clinical examination and conventional radiographs does not yield an adequate amount of information to allow appropriate management of the patient. A case-by-case approach is recommended and a CBCT scan should have a net benefit to the management of a patient’s endodontic problem”.
Clinical decision-making in endodontics
Clinical decision-making in endodontics is a process which involves the clinician’s diagnostic skills and the patient’s presenting signs and symptoms. It is a conclusion reached only after assessment of signs, symptoms, examination, special tests, consideration of expected outcome and, most importantly, the patient’s wishes. Therefore, “decision-making depends on the skill and experience of the clinician and the treatment options available which is termed as evidence-based practice” (Sackett et al, 1996).
However, “the needs and preferences of the patient are what drives the treatment decision since only the patient is truly the expert as to how he/she feels about maintaining a tooth, what symptoms are tolerable, what risks are worth taking and of course what costs are acceptable” (Bergenholtz and Kvist, 2014). Therefore, a patient-centred outcome is ideal. “Diagnosis is seen as only one part of the medical decision process” (Ledley and Lusted, 1959). Once a clinical decision has been reached, only then should treatment be executed with the patient’s informed consent.
TABLE 2: A Hierarchical Model of Efficacy: Typical Measures of Analysis (Fryback and Thornbury 1991)
Radiographs have been used as an imaging tool to base clinical decisions on and Strindberg developed a system in 1956. His system was based on biology and can be perceived as being dogmatic and inflexible. In the Strindberg system, a normal periradicular situation on periapical image with no patient symptoms was identified as endodontic success and a periradicular lesion apparent on a periapical radiograph was identified as endodontic failure. This has been discussed by Kvist 1994 and in a series of papers (Papers I-V, 1998, 1999 and 2000) where he proposed an alternative theory based on Praxis Concept (Jensen 1985). Praxis, which is Greek for process, is the process by which a theory or skill is enacted, embodied or realised. This theory states that personal values influence endodontic treatment and that clinicians use ‘cut-off’ points in their decision-making process.
Fryback and Thornbury (1991) have discussed the assessment of the contribution of diagnostic imaging to the patient management process in their seminal paper, The Efficacy of Diagnostic Imaging. In their study, they propose a ‘Hierarchical Model of Efficacy’, which is an organising structure for appraisal of the literature on the efficacy of imaging. There are six levels as listed in Figure 4:
According to Fryback and Thornbury (1991), with level three “the imaging information may change the differential diagnosis, strengthen an existing hypothesis, or simply reassure the physician”. With level four, ‘Therapeutic Efficacy’, “an imaging examination result may influence the physician’s diagnostic thinking and yet have no impact on patient treatment”. With level five, ‘Patient Outcome Efficacy’, “is concerned with whether there is measurable effect of the image on the outcome experienced by the patient” since the ultimate goal of dental care is to improve, or return to normal, the health of the patient.
Therefore, this structured critical review will focus on levels three, four and five in the ‘Hierarchical Model’ (Table 2) since the question posed is the use of an imaging modality (CBCT) and how it influences clinical decision-making in endodontics.
So, with regards to the use of CBCT in clinical decision-making in endodontics, what does the current literature say? Evidence appears to be sparse. Mota de Almeida et al (2014) have concluded that “CBCT has a substantial impact on diagnostic thinking in endodontics when used in accordance with the European Commission guidelines”. In their clinical study, Balsundaram et al (2012) concluded that “Lesion size and choice of treatment of periapical lesions based on CBCT radiographs do not change significantly from those made on the basis of 2D radiographs”. Cheung et al (2013), concluded that “there were substantial disagreements between PA and CBCT for assessing the periapical status of molar teeth, especially for the maxillary arch”.
It is clear that there is not an agreement of opinion and whether there is a clear benefit to the clinician and to the patient in taking a CBCT scan. An investigation of available evidence as it relates to levels three, four and five, may clarify the role of CBCT in endodontic decision-making.
The research question for this study: Does CBCT influence clinical decision making in endodontics?, arose from the author’s interest in the imaging modalities used in endodontics. In the author’s almost 20 years clinical experience, it has been noted that many Scottish patients wish to keep their teeth and avoid extractions. People’s attitudes to dentistry, which may be media and culturally led, appear to be changing. The limitations within the National Health Service (NHS) in Scotland, may have led patients to look at private options to restore their teeth with a view to avoiding costly dental implants.
In the author’s opinion, root canal treatments are being considered more by patients, not only on the NHS but also privately. The author has found that since patient expectations are sometimes high, the diagnostic process must give the clinician and patient as much information as possible so the patient is able to make the correct informed decision. CBCT may offer more information, as discussed earlier, but does this information make a difference in the decision-making process? CBCT, being a relatively new and exciting diagnostic tool in endodontics, is used by some general dental practitioners and specialists in the UK but its use should be only when radiographs do not prove diagnostically beneficial. The question arises, when is this?
As discussed earlier, ESE guidelines are quite specific. CBCT should not be taken routinely in the diagnostic process but only when there is a net benefit to the patient. Clinically, a patient may present to a clinician with symptoms which cannot be diagnosed either upon clinical examination or with a radiograph. In this scenario is a CBCT useful?
The aim of this study is to perform a structured critical review on the current published research and to draw a conclusion as to the influence of CBCT in clinical decision making in endodontics.
The objectives of this review are based on nine basic steps, as suggested by Boland et al (2014):
About the author
Arvind Sharma, BDS(Dund), MSc(Endo), MJDFRCS(Eng), MFDSRCPS(Glas), work in practice limited to endodontics and takes referrals at New Life Teeth in Edinburgh and Philip Friel Advanced Dentistry in Glasgow.
This article is based on the submitted dissertation in partial fulfilment of the requirements for the Degree of Master of Science in Endodontology, 2016. The author appreciates that much of the in-depth analysis has been omitted for the purposes of the current publication and readers are welcome to contact the author for more detail if they so wish – visit asendodontics.com for info.
References will be provided in full in the second part of the article, which will be published in the next issue of Scottish Dental.
This article is the first in a series that aims to introduce the modern-day dental practitioner to evidence-based dentistry (EBD). After reading this series, you will be clearer about how to keep abreast of the ever-growing evidence base and the latest guidance. You will know where to look for evidence and learn how to maximise time spent searching for evidence to inform your practice.
In our day-to-day lives, we have become accustomed to using search engines such a Bing or Google to help answer simple questions, but, when it comes to our clinical work and professional life, we need to take a more formal approach in our search. There are a number of web-based scientific databases that catalogue evidence. The databases can be thought of as massive online libraries, but like any library, if you don’t know your way around it or the cataloguing system used, then you are likely to get lost and spend hours searching for what you need. Therefore, having an awareness of the different scientific databases available and understanding how to use them is a good starting point.
An example of a well-known database, and one you may have already used is PubMed. Simply typing the word ‘dental’ into the search box on PubMed results in more than half a million hits – 516,870 to be precise. These 516,000 hits are spread over 25,844 pages, which makes for a lot of reading. Clearly, we need a more focused approach. So, what then if we pick a subject within dentistry such as fluoride varnish? This search still returns 1,293 hits spread over 65 pages.
The point we are demonstrating here is that there is a wealth of information and publications that we can make use of, but there is some skill required to negotiate databases and identify quality evidence. A busy practitioner needs access to high-quality evidence quickly and easily.
The American Dental Association describe EBD as “an approach to oral healthcare that requires the judicious integration of systematic assessments of clinically relevant scientific evidence, relating to the patient’s oral and medical condition and history, with the dentist’s clinical expertise and the patient’s treatment needs and preferences.”
As dentists we want to do our best for each and every patient we treat, and this is at the heart of EBD. Most dentists will be confident in their clinical skills and will listen to patients but not all will be confident in the strength of evidence behind how and what they practice. The evidence should be a constant go to for a modern-day dentist.
Developing an evidence-based approach can be thought of in five stages:
In your life outside of the surgery, you will already be using this approach, whether you realise it or not. Take buying a new car, for example. Let’s say it is a used car; you may not want to rely solely on the sales person’s word that the shiny car on the forecourt really is the best one for you. You will need to think about what it is you really need from the car – is a sporty convertible with two seats and no boot space going to suit your lifestyle? Maybe it is.
Most people will search the internet comparing various cars on independent websites; they will look in magazines or speak to friends and family beforehand. So, when you arrive at the showroom you already have an idea of what you are looking for and what you need from a car. At this point, you have carried out the first stage of an evidence-based approach: Asking the right question. You have also begun the second stage: Searching for the best available evidence.
When you have identified a potential car, you will want to continue your search for evidence to support your decision to buy. You will want to know more details about the service history, you might inspect the paintwork, check how many miles it has done and ask about previous owners. You will combine this information with what you found out previously and check the quality of the evidence before you. This is stage three: Critically appraising the evidence.
Next comes the big decision; whether to go ahead with the purchase. After carefully considering all the evidence you have available, you may or may not decide to buy the car, this is stage four: Applying the evidence.
The final stage is evaluating the outcome. This will take place in the months and years to come when you will be driving the car. If the car keeps breaking down and needs multiple new parts, you might question your approach and the evidence upon which you based your decision.
In this article we will cover stages one and two of the evidence-based approach.
Figure 1: Hierarchy of evidence 
Evidence-based dentistry starts with a clinical question. You need to be clear about what it is you are trying to find evidence for. A good technique to help develop your question is to use PICO.
PICO is an acronym for Population, Intervention, Comparator and Outcome. It is used when developing a question regarding a clinical scenario. Say, for example, you are a general dental practitioner; you suggest that the five-year-old patient in your chair should have fluoride varnish applied to her teeth. The patient’s parent questions this; he asks you “what good will it do?”, and at this point, he does not provide consent.
Using the PICO approach, we can build our question and start our search for the evidence. First of all, we need to establish the key population group that we want to find evidence about. In this case, it is children.
Next, we need to think about what treatment we are proposing and what the alternative might be. Here, we are proposing fluoride varnish application and the comparison would be no fluoride varnish. You could also choose an active treatment for comparison, such as fluoride mouthwash or toothpaste. Having an alternative prevention option might help win over the parent in this scenario.
Having a clear idea about what outcome you want from the treatment is important. Here, our key outcome is the caries rate in the child.
As a result of this process, we now have a PICO question we can use in a database search:
We now have a clear PICO question for moving forward with and have completed stage one. In the next stage, we need to think about the types of evidence there are and where we can find them.
This section will aid you in the search for the best available evidence. It has two parts. In the first part we will explore the hierarchy of evidence and the uses for each type, while the second part published in the next article, will take you through the practicalities of different databases.
First let us think about the different types and levels of evidence available. The most common and easy way to think about evidence is as a pyramid or hierarchy as shown in Figure 1 on the previous page.
It is quite intuitive, with the highest levels of evidence found at the top of the pyramid. Each type of evidence has a role to play in shaping healthcare. We will work our way up the pyramid discussing each of the types of evidence in turn while exploring the pros and cons of each.
Animal and in vitro research can be useful in the initial stages of developing treatment, for example when exploring causes behind disease or investigating an early idea or hypothesis.
The dental materials we use are initially tested in the lab. If they fail at this stage then there would be no point in testing the material in humans without overcoming the initial flaws identified.
With animal experiments there can be an issue when it comes to translating or replicating findings in humans. Some treatments may never work or they may actually be harmful to humans. The process of getting from the lab bench to chair side can take decades of refinement.
In this article, our focus is on what works best in the clinical situation and therefore this type of lab-based study is not immediately transferable into practice.
Initially, most people think their own ideas are great but do they stand up to the scrutiny of others? As we mentioned above, ideas need testing. Personal opinions and written editorials often only provide one view point. Therefore, it would not be a good idea to change your practice based on a discussion over a cup of coffee or on a single editorial on a website, magazine or journal.
There are occasions when a combined opinion can be useful though. Sometimes professional groups come together to give an opinion or stance on a particular issue. This often involves bringing together a range of currently available evidence. The downside is that the opinion will include some of the group’s own biases.
A recent example of a professional group summarising evidence is the Scottish Consultants in Dental Public Health Group, Recommendations on the use of fluoride toothpaste and fluoride supplements in Scotland 2017. The document is clearly referenced and has been produced in consultation with a renowned guideline development group. This type of opinion holds more weight and can be taken more seriously.
A large number of articles published in dental journals tend to be case reports or case series. They are based on one or very few cases. Treatment is often provided by one practitioner with a particular special interest or expertise. It may be difficult to directly replicate the treatment situation. Also, the patient characteristics are unlikely to be exactly the same as your patient.
They are particular useful in the case of rare or serious events. A case series published in 2012 presented two cases of fatal anaphylaxis following irrigation of tooth extraction sockets with chlorhexidine. Rare events such as this can change practice very rapidly.
Case control studies are retrospective observational studies. They do not test an intervention but are used to help find out what might cause a disease or be associated with it. As the name suggests, they are made up of two different groups, cases and controls. Cases will have the particular disease of interest and will be compared to controls that do not have the disease of interest. Researchers will take extensive histories from both groups and compare factors such as lifestyle. They are useful for establishing risk factors that are associated with a disease.
Recently there has been a lot of interest in understanding the causes of dementia. With an ageing population, if we could find out how to prevent dementia then this could have a great impact on the health of the population. One hypothesis queries whether periodontitis has any association with dementia. A research group in Granada carried out a case control study to find out if there was such an association. They compared 180 people with cognitive impairment to 229 without any impairment. After controlling for known risk factors they found there was a statistically significant association between periodontitis and dementia.
As mentioned before, case control studies are useful for establishing if associations exist between risk factors and disease. A lot more evidence is required in order to prove causation and establish the sequence. In this example, one might question whether the periodontal disease came before the dementia or whether the patient developed dementia and then stopped brushing as well as before? If you want to learn more about causation, then a good starting point is to read about the work of Sir Austin Bradford Hill. Sir Bradford Hill was an epidemiologist during the 19th century, in an after dinner speech he set out a number of considerations that should be taken into account when trying to establish causation.
Cohort studies are another form of observational study and are much more useful in establishing causes of disease. As the name suggests, they include a cohort of people with all the subjects included in the study initially free from the disease of interest. Detailed histories and in some cases examinations take place at the beginning of the study. The cohort is then followed up, often over a number of years, and observed for signs of the disease.
One of the most famous cohort studies took place in the US in a town called Framingham. The town in Massachusetts was to be the centre of a study that has now lasted 69 years. It focused on understanding the causes of cardiovascular disease as public health specialists recognised this as a major threat to the population of the US. People in the town who were free of cardiovascular disease were enrolled in the study and observed for many years. Detailed information on behaviour, lifestyle and other characteristics were recorded. Investigations including blood pressure monitoring and ECG’s were carried out as the study progressed. It took 10 years for the first key finding to emerge. The researchers were able to show that as blood pressure increased, the incidence of coronary heart disease also increased. The study produced the foundations of preventative medicine and discovered many of the causes for heart disease that we aim to prevent today.
A randomised controlled trial is the study of choice for testing new interventions in dentistry. They are experimental in nature and use randomisation techniques to reduce risk of bias and confounding factors that may influence outcomes. Patients are selected against strict inclusion and exclusion criteria ensuring they have similar baseline characteristics. There are then randomised into two arms, treatment and control. In the treatment arm, the subjects receive the new treatment under investigation. This is compared to the subjects in the control arm who will receive either placebo or current standard therapy.
Using a randomisation process to allocate patients to the different arms of a trial reduces the risk of selection bias, which is present when there are systematic differences between baseline characteristics of the groups being compared. Randomisation is best done using a computer-generated sequence that is independent of influence from the investigators. A trial that conceals group allocation from both the patient and the investigator is described as double-blind, in that neither know if they are receiving the new treatment or the alternative be that a placebo or standard care. At the end of the trial, the outcomes from each arm are then compared for any differences and inferences drawn on whether the treatment is effective.
There have been many randomised controlled trials (RCT) in dentistry, all of varying standards. Although an RCT is high in the hierarchy of evidence, it is still important to critique how the research was carried out and to what standard. We will cover that in article two.
The highest level of evidence is a systematic review. They bring together all the existing evidence on a particular question. Systematic searches of the literature are initially broad and can result in thousands of hits on databases such as PubMed. The review team will set criteria to focus the review down to include studies that answer specific questions. They then carry out critical appraisal of the studies to assess quality. If the studies all measure similar outcomes then the results of the trials can be compared by extracting the data and using statistical techniques in a meta-analysis. This gives more weight to the studies.
Guidance documents aim to bring together the current best available evidence on a given topic and make recommendations. National Guidance Groups such as Scottish Dental Clinical Effectiveness Programme, Scottish Intercollegiate Network and the National Institute for Clinical Excellence comprise a team of expert researchers and clinicians. They have a formal methodical approach to appraising the evidence; they combine this with expert opinion to arrive at their recommendations. We will look more at guidance and the influence they have on practice in the next article, which will feature an interview with Dr Doug Stirling from SDCEP.
So now we have reached the top of the pyramid and it should be becoming clear that there is a wealth and variety of information out there. We should be mindful of what evidence exists for the treatment we are providing our patients. Each type of study or research has its own pros and cons. The next article will focus on the practicalities of where to find the evidence, how to get the most out of databases and, importantly, how to critique the evidence you find.
General dental practitioners have opportunities to get involved in clinical trials, especially in Scotland. A number of trials have been run from the University of Dundee including the IQuad trial which is an acronym for Improving the Quality of Dentistry. This trial looked at the effectiveness of the simple scale and polish on periodontal disease with published results expected soon. Find out more here.
The FiCTION trial, again it is an acronym, which stands for Fillings in Children Teeth Indicated or Not. Find out more here.
Recruitment to the latest clinical trial called REFLECT is ongoing. The trial is focused on understanding more about the effectiveness of 5000ppmf toothpaste. Dr Carly Ross BDS (Gla) MJDF (RCSEng), clinical research fellow and honorary specialty registrar in special care dentistry at the University of Dundee Dental School, explains about the role of general dental practitioners in helping shape the evidence.
General dental practitioners have an important role to play in evidence-based dentistry. Along with the current scientific evidence and the patient’s needs, a GDP’s own clinical expertise helps to shape the concept of evidence-based dentistry. From this, clinical guidelines can be produced which assist GDPs in providing high-quality clinical care using the best available evidence.
Ninety percent of dental care is provided in primary care so it is essential that research is conducted in this setting. Many clinical trials take place in primary care in Scotland so input from GDPs is important to allow high-quality research to be carried out. The REFLECT clinical trial is being carried out in general dental practices and aims to evaluate the effectiveness and cost benefit of prescribing high dose fluoride toothpaste in older adults. The trial is currently recruiting practices in Scotland to take part.
If you are interested in taking part, please email firstname.lastname@example.org or call 01382 381 213 for more information.
The Cochrane Collaboration carry out systematic reviews that include evidence derived mainly from randomised controlled trials. They use strict methodology and techniques for carrying out reviews and they can be thought of as setting the standard of how reviews should be conducted.
Dr Thomas Lamont, clinical research fellow and honorary specialty registrar in restorative dentistry at Dundee Dental School, is a clinical editor with Cochrane. Below he tells us in some more detail about the methods used in a Cochrane review and what his role is.
Cochrane systematic reviews will include multi-disciplinary teams including patient representatives, clinicians, clinical academics, methodologists, statisticians, health economists, editors and
As clinical editor, I help the review groups by providing clinical and methodological advice to the teams. I also help to peer review Cochrane reviews to ensure they meet the required Cochrane standards. I also provide lectures/seminars on the Cochrane review methodology to clinicians and academics.
It is important that we review and integrate the evidence to ensure that we provide the best possible care for our patients. This cannot be done in isolation and needs to be combined with our own clinical experience and the wishes/values of our patients.
Cochrane reviews provide high-quality evidence for use in the field. They add to the evidence base and distil a large amount of information, therefore making it easier for clinicians to make sense of all the
Find out more about Cochrane here: oralhealth.cochrane.org
2. SUNY Downstate Medical Center. Medical Research Library of Brooklyn. Evidence Based Medicine Course. A Guide to Research Methods: The Evidence Pyramid.
3. Scottish Consultants in Dental Public Health Group, read online 24 March 2017. Recommendations on the use of fluoride toothpaste and fluoride supplements in Scotland 2017.
4. Chlorhexidine and hypersensitivity reactions in dentistry. M.N. Pemberton, J. Gibson. s.l.: British Dental Journal, 2012, Vol. 213.
5. Is periodontitis a risk factor for cognitive impairment and dementia? A case-control study. Gil-Montoya JA, Sanchez-Lara, Carnero-Pardo C, Fornieles F, Montes J, Vilchez R et al. Granada: J Periodontaol, 2015, Vol. 86.
6. The Missed Lessons of Sir Austin Bradford Hill. Phillips CV, Goodman KJ. Texas: BioMed Central, 2004.
7. The Framingham Heart Study and the epidemiology of cardiovascular disease: a historical perspective. Syed S mahmood, Daniel Levy, Ramachandran S Vasan, Thoma J Wang. 9921, s.l.: The Lancet, 2014, Vol. 383.
• Derek Richards, Jan Clarkson, Debora Matthews, Rick Niederman. Evidence based Dentistry: Managing Information for Better Practice. London: Quintessence Publishing; 2008.
• Jan Clarkson, Jayne E harrison, Amid I Ismail, Ian Needleman, Helen Worthington. Evidence-Based Dentistry For Effective Practice. London: Martin Dunitz; 2003.
Derek Richards BDS, FDS, MSc, DDPH,FDS(DPH), is a consultant in dental public health, editor of the Evidence-based Dentistry Journal and director of the Centre for Evidence-based Dentistry now based at the Dental Health Service Research Unit in Dundee. He holds honorary senior lectureships at Dundee and Glasgow Dental Schools and is a specialist advisor to the Scottish Dental Clinical Effectiveness Programme (SDCEP). He has been involved with a wide range of evidence-based initiatives both nationally and internationally since 1994. He is co-author of the book, Evidence-Based Dentistry: Managing Information for Better Practice (Quintessential of Dental Practice) and the chief blogger for the Dental Elf website.
Niall McGoldrick BDS, MFDS RCPS(Glasg), is a specialty registrar in dental public health and is currently studying for his masters of dental public health at the University of Dundee. He graduated from Dundee Dental School in 2013 and then went onto complete longitudinal dental foundation training and dental core training in a range of specialities in Scotland including a placement with the SDCEP. He is a co-founder of the Scottish Charity, Let’s Talk About Mouth Cancer that is focused on the early detection of mouth cancer. He has received multiple awards for his work both inside and out of the NHS. Most recently, he received a National Award, NHS Young Achiever, from NHS Scotland and Scottish Government.
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