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Abstract
This study was conducted to clinically and radiographically evaluate the effect of retaining mandibular overdenture, by retention silicon material, on the bone level and mobility of the abutment teeth. Eighteen patients were selected from the outpatient clinic in the department of prosthodontics, faculty of oral and dental medicine, Cairo university. All the selected patients had a completely edentulous maxilla and only two canines in the mandible. All patients were completely free of any systematic diseases or conditions that might affect the bone quality or quantity around the abutment teeth or the mobility of the teeth. In this stage the selected 18 patients were randomly divided into two groups A and B. All patients were treated by upper conventional complete dentures opposed by tooth supported lower complete overdentures. In group A, the overdenture abutment teeth were covered by post and copping carrying an attachment. Retention silicon act as housing by relining the denture base in the area of the attachment. In group B, the overdenture abutment teeth were covered by post and copping only with no attachment mechanism. Patients were clinically and radiographically evaluated at the time of the prosthesis insertion and after 3 and 6 months. Radiographic evaluation was carried out by measuring the amount of change in alveolar bone height around the abutment teeth using the digora radiographic system. Clinical evaluation was done by measuring the mobility of abutment teeth using the periotest