الفهرس 
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Abstract
This study was conducted to evaluate and compare the effect of bilateral balanced occlusion and canine guidance on the masticatory function in implant-retained mandibular overdentures using electromyography.
Twelve completely edentulous patients aged 45-65 years, having acceptable maxillomandibular relationship, sufficient inter-ridge space and with no previous denture experience were selected for this study. Complete maxillary and mandibular dentures were fabricated for each patient. Each patient was evaluated radiographically using (CBCT).
A mucoperiosteal flap was reflected exposing the mandibular interforaminal region for optimal implant placement. The old denture was duplicated in clear acrylic resin and used as a radiographic surgical guide. Two implants were screwed in position. The length of the implants were (10 mm) and the diameter is (3.6mm).
After a healing period of three months, acrylic maxillary and mandibular overdentures were fabricated with bilateral balanced occlusion for six patients. For the other six patients, canine guidance occlusion was applied in the try in stage. The positioner attachments were screwed on the implants by direct pickup method. The dentures were used for two weeks.
EMG evaluation of masseter and anterior temporalis muscles on both sides was conducted on patients after using their dentures with bilateral balanced occlusion and canine guidance occlusion by clenching on a preformed silicon index, chewing peanut and chewing cake of standard size.
The dentures with bilateral balanced occlusion were then converted into canine guidance occlusion and the dentures with canine guidance occlusion were converted into bilateral balanced occlusion using the same dentures. The dentures were used for two weeks and the same procedure of EMG evaluation was repeated.
The results revealed that the highest EMG activity of the masseter and anterior temporalis muscles was recorded during clenching on a preformed silicon index followed by peanut then cake for both occlusal concepts.