Clinical Comparative Study of Retention for Single Versus Two- Implant Mandibular Overdentures Reinforced by PEEK Framework

Abstract

Aim: This clinical work aimed to evaluate and compare retention force of single versus 2-implants mandibular overdentures reinforced by poly ether-ether ketone (PEEK)framework. Subjects and methods: sixteen completely edentulous participants were eligible for this study. Patients were randomly divided into two equal groups, for group I single implant was inserted in mandibular midline area, single ball abutment was threaded in place, each patient receive mandibular overdenture reinforced with PEEK framework. In group II, insertion of 2-implants in the mandibular canine region, two ball abutments were threaded in place, each patient receives mandibular overdenture reinforced with PEEK framework. The evaluation of retention was performed using digital force-meter device at time of overdenture insertion (T0) & three months later (T3). Both groups were compared with independent t- test. Results: at time of mandibular overdenture insertion (T0), two groups were recorded significant difference in retention forces. 2-implants with PEEK framework recorded higher retention forces compared to single-implant with PEEK framework (P value≤0.001). Significant difference in retention forces was recorded after 3 months between two different groups (P value≤0.001). Within group when compared mean retention values at (T0, T3) showed insignificant difference as in group I (P value 0.058) & in group II (P value 0.148). Conclusion: both single and 2-implants mandibular overdentures reinforced with PEEK framework can provide acceptable retention forces. Two-implant mandibular overdentures provide higher retention forces than single-implant mandibular overdentures during different evaluation periods.