A prospective cross-over study to evaluate the effect of two different occlusal concepts on the masseter muscle activity in implant-retained mandibular overdentures.

Ahmed M Abdelhamid,Mohamed H Imam,Kenda I Hanno

doi:10.1186/s40729-015-0034-y

Ahmed M Abdelhamid, Mohamed H Imam + Show 1 more

Open Access

https://doi.org/10.1186/s40729-015-0034-y

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Abstract

BackgroundThe purpose of this prospective cross-over study is to evaluate the effect of bilateral balanced occlusion and canine guidance occlusion on the masseter muscle activity using implant-retained mandibular overdentures.MethodsAfter evaluation of 12 completely edentulous patients using cone beam computed tomography (CBCT), mucoperiosteal flaps were reflected exposing the mandibular interforaminal region. Two implants were placed in the interforaminal region for each of the 12 patients. After a healing period of 3 months, acrylic maxillary complete dentures and mandibular overdentures were fabricated with bilateral balanced occlusion for 6 patients and canine guidance occlusion for the other 6 patients. Electromyographic evaluation of the masseter muscles, during clenching on a silicon index and chewing peanuts and cake, was conducted on the patients after using their dentures for 4 weeks. Each occlusion concept was then converted into the other concept using the same dentures, and the procedure of evaluation was repeated after 4 weeks. The recordings were analyzed statistically using Wilcoxon signed ranks test. p < 0.05 was considered statistically significant.ResultsThe highest electromyographic activity of the masseter muscles was recorded during clenching on a preformed silicon index followed by chewing peanut then cake for both occlusal concepts. The recordings of the masseter muscle associated with canine guidance occlusion were higher than bilateral balanced occlusion but with no statistically significant difference except between the right masseter muscles during clenching (p = 0.042*).ConclusionsBoth bilateral balanced occlusion and canine guidance occlusion can be used successfully in implant-retained mandibular overdentures without affecting masseter muscle activity.

Highlights

The purpose of this prospective cross-over study is to evaluate the effect of bilateral balanced occlusion and canine guidance occlusion on the masseter muscle activity using implant-retained mandibular overdentures
In the right masseter muscle, bilateral balanced occlusion has shown lower root mean square (RMS) values on clenching with the silicon index, chewing peanut, and chewing cake compared to the RMS values of canine guidance occlusion (Table 1)
In the left masseter muscle, bilateral balanced occlusion has shown lower RMS values on clenching with the silicon index, chewing peanut, and chewing cake compared to the RMS values of canine guidance occlusion

Summary

Introduction

The purpose of this prospective cross-over study is to evaluate the effect of bilateral balanced occlusion and canine guidance occlusion on the masseter muscle activity using implant-retained mandibular overdentures. Treatment of edentulous patients using a conventional complete removable denture is a common clinical undertaking. Those patients may experience problems which include pain during mastication, reduced masticatory ability, as well as insufficient stability and retention of the mandibular denture [1]. Many authors [4] emphasized the role of occlusion as a key factor in implant success. The prosthesis must be fabricated as accurately as possible in order to achieve long-term success, and occlusion should be a key factor of the overall success rate

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