Measuring primary stability for the inclined implants retaining mandibular overdenture using resonance frequency

The stability of the implant after insertion is the most important factor influencing successful osseointegration. Initial stability at placement and the development of osseointegration in the following healing process are two important factors for implant success. The purpose of this study was to prove the primary stability of the implant and abutment angulation and its reliability upon the micromotion level and stress-distribution pattern around the neck of the implant by means of Osstell and comparing these results with a finite element model results. Nine complete edentulous patients were included in the study, where the primary stability was measured using (Osstell) and the results were compared with the computer model results. It was observed that no difference and no change between the right and left sides, where both were stable in bucco-lingual and mesio-distal measurements. And also the mean values for right and left sides at 1, 3, 6 and 12 months were nearly stable at all stages in bucco-lingual and mesio-distal measurements. The Osstell system proved to be sensitive in measuring dental implant stability in hard and soft interfaces, and was found to be able to detect changes in the fixture interface stiffness.