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 singleimplant
mandibular overdentures during different evaluation periods.