Study the Effects of Bilateral Balanced Occlusion and Canine Guidance on Masseter and Temporalis Muscle Activity in Implant-Retained Overdentures Constructed with Open and Closed Tray Impression

Abstract

The aim of the study was to investigate the effects of balanced occlusion and canine guidance on masseter muscle activity in implant- retained overdentures constructed with open and closed tray impression. Material and methods: For the current study Twelve completely edentulous patients were selected from the Outpatient Clinic of Removable Prosthodontic Department, Faculty of Dental Medicine, Al Azhar University (Assiut branch) according to special inclusion and exclusion criteria. All procedures were explained to all the patients and informed consent was assigned by each patient before the commencement of the investigation. All patients were divided into two groups; with the first group open tray impression techniques was used. While the second group used close tray impression techniques.For each group two dentures were constructed; the first denture was constructed with bilateral balanced occlusion, while the second denture was constructed with canine guidance.Conclusion: Successful implant overdenture has a positive effect on the masticatory efficiency regardless of the type of impression used. Masticatory efficiency improved with closed tray impression method together with bilateral balance occlusion had the best masticatory efficiency during chewing soft food or hard food than any other impression method (close-open tray impression) with any other occlusion (bilateral balance-canine guided occlusion) during chewing soft or hard food.