Effect of different means of retention on single midline implant supporting mandibularoverdenture

Abstract

Purpose: This study was conducted to evaluate the effect of locator attachment versus retention silicone lining material on the supporting structure of a single midline implant supporting mandibular overdenture and retention of the prosthesis. Methods: Sixteen patients with completely edentulous mandibles were selected for this study and divided into two groups. In all patients, a single implant was placed at midline area after cone beam radiography was performed. Group I was retained with locator attachment, while Group II was retained with silicone material. Follow-up was carried out at denture insertion, six months and 12 months following insertion. Peri-implant bone loss as well as posterior bone loss was evaluated using cone beam computerized tomography and retention was evaluated using forcemeter device and wire hook attaches to the prosthesis. Results: There was a statistically significant difference in peri-implant bone loss between the two groups during the 2nd follow up period (P ≤0.05). There was a statistically significant difference in periimplant bone loss between the two groups at the 2nd follow up period and at the end of the study period (P≤ 0.05). There was no statistically significant difference in posterior bone loss between the two studied groups (P ≤ 0.05) and regarding retention there was no statistically significant difference between the two groups along the follow up periods. Conclusion: From the results obtained from this study, it could be concluded that locator attachment showed lower peri-implant bone loss than Retention. Silicone material in the overall follow-up period with a statistically significant difference. This was attributed to the decrease in the effect of the resiliency of attachments and Silicone over time, and the more permanent effect of locator attachment.