The effect of two different occlusal concepts on the masseter muscle activity in implant retained mandibular overdentures

Abstract

Aims: The purpose of this study was to evaluate the effect of bilateral balanced occlusion (BBO) and canine guidance occlusion (CGO) on the masseter muscle activity using implant-retained mandibular overdentures. Subjects and Methods: Cone beam computed tomography evaluation of twelve edentulous patients was completed. Mucoperiosteal flaps were reflected and two implants were placed in the interforaminal region for each of the twelve patients. After a healing period of 3 months, acrylic resin maxillary complete dentures and mandibular overdentures were fabricated with BBO for six patients and CGO for the other six patients. Positioner attachments were used. 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. The value of P Statistical Analysis Used: Kruskal–Wallis test and Mann–Whitney U-test were applied. Significance of the obtained results was judged at the 5% level. A P Results: The 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 CGO were higher than BBO but with no statistically significant difference. Conclusions: The results show that by applying CGO, muscle activities similar to bilaterally balanced occlusion were obtained.