The effect of different types of attachment system in implant assisted over denture on rate of resorption of grafted anterior mandible (prospective clinical study)

Abstract

Purpose: Mandibular implant assisted overdentures have been considered as satisfactory treatment plan of mandibular edentulismand might be hindered by limited bone height and or width in interforaminal region which necessitate implementation of bonegrafts. However, bone graft resorption is expected after loading where the design of retention system could influence resorptionrate. So the objective of this study is to assess the effect of using retention sil versus PEEK matrix as a retention system ofoverdenture on supporting bone of augmented anterior mandible.Material and Methods: Fourteen patients were randomly assigned into two groups after being subjected to anterior mandibularbone grafting and implant insertion., for group I patients. Implants were loaded by mandibular overdentures using the OLSattachments system (PEEK female) and for group II implants were loaded using silicone matrix (Retention Sil 400) over thelocator abutments with its dual retention mechanism. Implant stability was assessed using (osstell). Peri-implant bone loss wasradiographically assessed after loading (at 6 months and 1 year intervals).Results: There was no significant increase in implant stability between the two groups. However, group II presents significantlylower bone loss one year after loading (p ≤ 0.01) than group I.Conclusion: It could be concluded that resilient matrix (retention sil) for locator attachment induce less bone resorption thanpeek matrix in anterior grafted mandibular bone.