Comparison Evaluation of the Effect of Resilient Attachments Versus Rigid Attachments on Muscle Activity in Mandibular Implant Retained Overdentures Cases

Abstract

Fourteen completely edentulous patients were selected from the outpatient clinic of the Prosthodontic Department, Faculty of Dentistry, Ain-Shams University, in the age range from 55-60 years divided to two groups equally, according to the type of attachment they were received: Group I: Ball abutments will be screwed into the fixtures and areas on the fitting surface of the denture opposing the implant abutments will be relieved to create enough space to accommodate the “O” ring attachments which will be picked up in the fitting surface of the denture. Group II: Telescopic abutments will be screwed into the fixtures and areas on the fitting surface of the denture opposing the implant abutments will be relieved to create enough space to accommodate their copings which will be picked up in the fitting surface of the denture. EMG recordings of the Masseter and Temporalis muscles will be performed at different follow up periods: immediately before surgery and three, six and nine months after loading the prosthesis. The EMG records for the masseter and temporalis muscles were taken by the aid of surface electrodes. The records were taken during: a- Maximum voluntary teeth clenching. b- Chewing hard food (pennate). c- Chewing soft food (banana). Pocket depth was measured during the follow up period after loading the prostheses using periodontal probe. Summary 123 The data were collected, tabulated, statistically analyzed and graphically represented with statistical package for scientific studies for windows. The following result was found;  There was statistically significant difference between conventional dentures and implant retained overdentures with ball and socket attachments and telescopic attachments throughout all the follow up period.  There was statistically significant difference between the tested functions (Maximum voluntary teeth clenching and eating hard and soft food) for all the tested items and at the different follow up visits.  There was statistically significant difference in muscle activity between the ball and telescopic attachment.  The two retention modalities showed statically significant increase in pocket depth throughout all the follow up period.  There was statistically significant difference in pocket depth between the ball and telescopic attachments.