|Year : 2020 | Volume
| Issue : 3 | Page : 269-277
Choosing the denture occlusion - A Systematic review
Ritika Bhambhani1, Shubha Joshi2, Santanu Sen Roy3, Aditi Shinghvi4
1 Departments of Prosthodontics and Crown and Bridge, Gurunanak Institute of Dental Sciences and Research, Kolkata, West Bengal, India
2 Department of Prosthodontics and Crown and Bridge, School of Dental Sciences, Krishna Institute of Medical Sciences Deemed to be University, Karad, Satara, Maharashtra, India
3 Public Health, Gurunanak Institute of Dental Sciences and Research, Kolkata, West Bengal, India
4 Private Practitioner, BDS, AMRI Medical Centre, Kolkata, West Bengal, India
|Date of Submission||15-Oct-2019|
|Date of Decision||29-Feb-2020|
|Date of Acceptance||24-May-2020|
|Date of Web Publication||17-Jul-2020|
Dr. Shubha Joshi
Department of Prosthodontics and Crown and Bridge, School of Dental Sciences, Krishna Institute of Medical Sciences Deemed to be University, Karad, Satara, Maharashtra
Source of Support: None, Conflict of Interest: None
Aim: The aim of the study is to acquire evidence for the choice of occlusion with anatomic/modified anatomic teeth in complete denture prosthesis.
Settings and Design: Systematic review following PRISMA guidelines.
Materials and Methods: The study reviewed original articles on various occlusal schemes bilateral balance occlusion (BBO), lingual occlusion (LO), Canine guided occlusion (CG), posterior group function occlusion (PGFO) have been applied to the complete dentures and were analyzed for the objective or subjective or both evaluations. The data were collected in standard format with the needed information such as year of publication, type of study, occlusal schemes compared, test methodology used, sample size for experiment and control, assessment of retention, stability, and other factors which determine the quality of life and period of follow-up. The risk of bias was calculated using tools RoB2.0 and robvis. At all stages, the inclusion and exclusion of studies were discussed among the reviewers.
Statistical Analysis used: Due to the heterogeneity in the data of the included studies no statistical analysis was used.
Results: Of the 1896 articles screened only 17 studies were included in the systematic review. These were discussed amongst the reviewers regarding the various occlusion schemes used. The subjective and objective criteria used in the studies was tabulated separately. They were then analyzed for the risk of bias using the robvis 2 tool.
Conclusion: No scheme is more superior to the other with the anatomic tooth forms. The use of alternative unbalanced schemes produces a similar satisfactory clinical outcome. The ridge classification also has a significant role to play in the preference for an occlusal scheme.
Keywords: Balanced occlusion, canine-guided occlusion, lingualized occlusion, occlusal scheme, occlusion in a complete denture
|How to cite this article:|
Bhambhani R, Joshi S, Roy SS, Shinghvi A. Choosing the denture occlusion - A Systematic review. J Indian Prosthodont Soc 2020;20:269-77
|How to cite this URL:|
Bhambhani R, Joshi S, Roy SS, Shinghvi A. Choosing the denture occlusion - A Systematic review. J Indian Prosthodont Soc [serial online] 2020 [cited 2020 Aug 9];20:269-77. Available from: http://www.j-ips.org/text.asp?2020/20/3/269/289933
| Introduction|| |
The complete denture prosthesis is irreplaceable in the rehabilitation of edentulous patients. It restores oral function and maintains esthetics and patients' psychological well-being. With better medical services and a greater life span, there is an equal requirement of functional oral rehabilitation, where complete denture prosthesis too has an important role to play. This applies greatly to our developing country where implant-supported prosthesis is still away from the reach of masses. Their fabrication includes the right blend of art and science of stabilizing it against all odds of oral musculature, function, parafunction, and gravity. The basic principles to be born in mind while fabricating a complete denture include retention, support, stability, and harmony with stomatognathic system with preservation of the surrounding tissues to achieve good esthetics and function. Undesirable denture movement may result during function by unfavorable masticatory forces, but these can be minimized by multiple contacts on both working and nonworking sides during centric and all excursive mandibular movements. Balanced articulation means the simultaneous anterior and posterior occlusal contact of teeth in centric and eccentric positions. This concept has been applied clinically as it is assumed to dissipate the oblique forces and improve retention and stability.
However, alternatively, another approach called lingualized occlusion (LO),, has been advocated, where only the maxillary palatal cusps articulate with the mandibular occlusal surfaces., There were reports of good acceptance of the latter too in terms of patient comfort. This makes us question the significance of the complicated procedures or rather time-consuming adjustments involved the balanced occlusion when speaking of clinical evidence. Moreover, here began a journey of various studies of different occlusal schemes and tooth forms.,
Various occlusal schemes other than the bilateral balanced occlusion and lingialized occlusion have also been used in denture fabrication. Schemes like Linear (Monoplane occlusion), Canine-guided occlusion, Partial group function occlusion, Buccalized occlusion have been researched upon.,,,,,,,,, The earliest mention of CGO in complete denture prosthesis was made by Gausch in 1986, where EMG (electromyographic) studies were done to explore the benefits. However, there is a need of more scientific evidence to apply these schemes in appropriate situations.
Complete denture occlusion and its prospective effects on the stomatognathic system along with the quality of life of the patient hence is an area of interest. More evidence-based research is needed due to different biomechanics of conventional denture prosthesis and the subjective factors involved in it. The role of occlusion is multifactorial toward the denture success–retention, support, stability, preservation of the residual ridge and surrounding tissues/muscles, and undoubtedly the esthetics. The denture behaves different than natural teeth as it acts as one unit, where the force applied to a single denture tooth gets passed on to the whole denture. The muscle attachments and functional and parafunctional movements have their role to play in the denture success.
The other factor which has to be born in mind is the adaptability of the denture patients and also the role of tissue resiliency which is not objectively considered widely in literature. It is understood that an objective evaluation of the latter is clinically difficult and so is its role in denture settling and associated occlusal changes. That is why the denture patients were rightly termed as the denture acrobats.
The balanced occlusion has been the preferred scheme for the stability of the denture, but yet questions have been raised and existed since decades regarding the clinical significance of BBO for denture success. Enter Bolus and Exit Balance' was mentioned in 1960's to emphasize the loss of occlusal balance during mastication. The deflective contacts may result in the tipping of the denture bases. But as the mastication time is much smaller than the other activities swallowing the bilateral balance would still be deisred. The aim being to minimise the deflective contacts. With use the balanced contacts originally created might be altered in the mouth but even then denture wearers can have clinical acceptance. This balance is not only dependent on the occlusal balance but also the lever balance created by the right tooth position (anteroposteriorly and mediolaterally and the occlusal height)., Various researches have concluded similar clinical results with other occlusal schemes, the denture teeth do not always contact, and the absence of interruptive and deflective contacts is what has been desired during function. The occlusal scheme pertaining to the above will fulfill the roles of retention and stability. Even if lost during function, the BBO may be helpful during seating during terminal arc of closure. The time and effort while preparing dentures with a balanced occlusion and the lateral forces which exist on working/nonworking sides are the areas which require evidence for the preference of BBO. Considering the Muller Devan's principle as an important parameter of success, this attempt has been made to look into more evidence related to the scheme which is clinically satisfactory and also maintains the integrity of the residual ridge and the muscles of mastication. The angle/direction and amount of forces associated to various schemes and its effect on lever balance, if known, can help choose the occlusal scheme not only by subjective preferences but also based on biomechanical principles.,
This systematic review has been taken up with an aim of acquiring evidence for the choice of occlusion in complete denture prosthesis. The null hypothesis being balanced and nonbalanced occlusion schemes is similar in providing the denture-related satisfaction, and no difference exists in resorption rates and long-term consequences. The authors tried to explore more of the qualitative and objective studies done in association with complete denture prosthesis.
| Methodology|| |
This review was done using the guidelines of Preferred Reporting Items for Systematic Reviews and Meta-Analyses.
Literature that investigated into complete denture occlusion was searched using the predetermined search policy of PRISMA guidelines. The search policy was based on a Population, Intervention, Comparison, Outcome, and Study Design framework, and it is depicted in [Table 1]. The search keywords such as complete denture occlusion, balanced occlusion, bilateral balanced occlusion, lingualised occlusion, occlusal schemes for complete dentures, canine guided occlusion, effect of tissue resilience, and denture occlusion were used. It resulted in 215 articles for “balanced occlusion,” 713 for “occlusal schemes,” 59 for “CGO in complete dentures,” 27 for “LO in CD,” 121 for “occlusal scheme in CD,” 1135 for “complete denture occlusion,” 158 for comparison in CD occlusion, and 25 for the BO in CD making a total of 2448 studies.
|Table 1: Population, Intervention, Comparison, Outcome, and Study Design search policy|
Click here to view
An electronic search of studies published till September 2019 in PubMed, Science Direct, Google Scholar, Cochrane Central Register of Controlled Trials, and EBSCOhost were included. The journals hand searched were the Journal of Prosthetic dentistry and the Journal of Indian Prosthodontic Society; cross references and bibliography were also referred to.
Inclusion and exclusion criteria
Abstracts and full research manuscriptin vivo original studies related to occlusal schemes were read thoroughly, and the following inclusion and exclusion criteria are depicted.
- Controlled clinical trial/randomized clinical trial
- Crossover trials
- Prospective and retrospective studies
- Objective and subjective tests
- Articles in English language
- Presence of follow-up period after insertion
- Use of anatomic or modified anatomic teeth.
- Case report and case series
- Review articles
- Animal studies
- In vitro studies
- Use of nonanatomic teeth for the denture fabrication
- Other language articles
- Implant-associated denture occlusion.
Articles were read thoroughly to assess methodology, randomization, sample size, control group, blinding of participants and personnel, quality of life, retention, and stability. The assessment was first done independently, and then, discussions were done among the reviewers to include or exclude the studies and to elaborate on missing data. The Cochrane Collaboration tool was used as an aid. Risk of bias was estimated as low, medium, or high based on the Cochrane risk of bias tool RoB2.0 and robvis [Chart 3] shows the use of robvis).
The data information from published articles was collected in the needed format to include the information such as year of publication, type of study, type of occlusal schemes compared, test methodology used, sample size, assessment of retention, stability, and other factors of denture quality assessment and period of follow-up ,,,,,,,,,,,,,, [Table 2].
| Results|| |
The steps of literature search were mainly identification, screening, eligibility, and inclusion or exclusion as suitable. Both reviewers did an independent search, and conclusions were reached by mutual discussions on the selected articles [Table 3].
| Discussion|| |
Most of the studies included have been crossover studies, and these trials decrease the intersubject response variations due to reasons such as masticatory strength and unrealistic expectations. Most of the included crossover studies have used the same denture base which would omit the duplication errors (Khamis and Hussein method). At the same time, there exists a carryover effect with no washout period, which may result in reporting bias from the patients' response.,, Some studies used single blinding when examiners were also involved in the denture construction whereas some studies were double blinded.,
The patient satisfaction was considered as the primary outcome to be tested, and the methods used have been subjective questionnaire formats related to denture-related satisfaction variables, Visual Analog Scale, Likert scale, oral health-related quality of life assessed using the Oral Health Impact Profile (OHIP), OHIP-edentulous adults, German Society for Dentistry and Oral Medicine for Functional and Diagnostic Therapy, and other rating formats [Table 2]. Tests for retention and stability were based on examiner skills  or Kapur index.
Objective analyses have been performed for the masticatory forces, masticatory efficiency, and the stress and strain on the ridge, and EMG studies for the muscle activity have been done. Masticatory function was assessed by food particle size estimation using sieve method, colorimetric determination, optical scanning, biting force, or weight loss of viscoelastic food. Dentures with CGO were preferred more for certain food products such as carrots and meat. BO and LO were found to reduce selective food avoidance and physical disability aspects of patient satisfaction. More dislodging forces in BBO could cause patients to avoid some foods causing an unpleasant eating experience. No difference in the masticatory efficiency was reported among various schemes,,, and on the contrary, the efficiency is more ridge dependent., In poor residual ridge conditions, LO was preferred by patients for acceptable stability and masticatory efficiency and retention. It allows modifications to adapt to various ridge types, elimination of lateral interferences, and settling without cuspal interferences., LO was also associated with a better lever balance and hence more controlled forces.
MO has been reported for the requirement of more adjustment time and more chairside corrections; it compromises on esthetics and masticatory efficiency with no special benefits. Anatomical tooth forms were found more efficient for chewing efficiency and denture adaptation; hence, the present review explored the latter and schemes with modified anatomic teeth., Anin vitro study on resilient edentulous jaw simulator was carried out for pressure analysis of various occlusal schemes to check for pressure on nonworking side by unilateral chewing. Pressure sensors and multichannel electronic strain indicators were used to check for pressure on the ridge under BBO, LO, and MO. The pressure in MO was found the least and almost similar in BO and LO. Results were found statistically equivalent for BBO and LO. Being anin vitro study, this was excluded.
Anterior tooth group function and CGO have been mentioned for the efficiency for chewing. The points to be explored further are, the effects on denture retention and transfer of occlusal stresses. Some researchers have named these as 'Lateral occlusal guidance studies' where canine or premolar guided occluion is preferred to bilateral balance. CGO was preferred for esthetics, phonetics, masticatory function, and retention in a crossover study with 50 subjects (10 dropouts) where all subjects preferred CGO, but a greater adjustment time was involved., In another study, similar results were concluded. Either a separate denture was fabricated or only the occlusal scheme was modified by alteration of canines. The CGO is the preferred scheme in dentulous patients for the well-known reason of discussion of posterior teeth during lateral movements, better esthetics, and lesser and easier fabrication time. A reduced muscle activity was explored, with no negative influence on lateral stability or higher resorption rates.
Little difference was found clinically among various occlusal schemes, so if the time taken for BBO is taken into consideration, the application of the same on a regular clinical basis is questionable. LO has been proved equally accepted but has not been taken as a control group in any of the comparisons. Scientific data for resorption patterns were not found in any of the studies, and a trend of subject dropouts might exist in prospective studies. A trend toward studies for the CGO has been comparatively more in the near past, and related literature was found only after the year 2000 [Chart 1]. The studies related to CGO are crossover trials which make them more valued, but none of the comparisons have been made with LO dentures. LO can provide the same freedom of movement as in neutrocentric or MO, even in cases of weak muscle engrams and with a better functional efficiency. The discrepancies in studies' results might occur due to certain factors like- clinician's technique or interoperator variability, tooth material and form selected, and various patient factors (ridge type, resilience and unrealistic or realistic expectations.). More scientific evidence for preference of certain schemes in specific situations and their long-term effect on ridge resorption would be beneficial. Studies based on finite element analysis for complete denture can be explored and have scope for future.
| Conclusions|| |
Hypothesis was found partially correct that all schemes, if wisely used, can bring out good clinical results. No scheme is more superior to the other when using the anatomic tooth forms [Chart 2]. The part of hypothesis regarding the resorptive rates is difficult to be supported with enough evidence as there are no prospective studies with the different occlusal schemes. There is scope for more evidence-based research for the preferred occlusal scheme in different ridge relations and comparative trials of CGO with LO. Balanced occlusion is one of the preferred choices for occlusal schemes but not for all the ridges. Lingualized occlusion can be helpful in resorbed ridges for the masticatory efficiency and even in providing bilateral balance. CGO is the most preferred occlusion scheme for dentulous situations and needs more evidence-based research related to its effects on denture stability.
The complete denture prosthodontics is the most difficult and skill requiring area to bring out the best rehabilitation in an edentulous patient. The wise choice of varied parameters is sure to result in clinical success.
We would like to thank all working toward an evidence-based dentistry.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Table 1], [Table 2], [Table 3]