Introduction: Numerous problems were described by complete denture wearers for example lack retention and stability of these dentures, thus decreasing chewing efficacy, and pain during mastication. These problems can be effectively overwhelmed with implant-assisted overdentures. Objectives: This study was done to assess the retention forces of all-zirconia (ZrO2 ), all-polyetheretherketone (PEEK), and titanium for two implant-retained mandibular overdentures. Materials and Methods: In each model, twenty-four similar acrylic resin mode positioned at the canine area. Models were categorized into 4 groups of 7 samples in each group; all all-zirconia (ZrO2 ), all-polyetheretherketone (PEEK), titanium and a combination of PEEK with zirconia. Alike experimental overdentures were prepared for all models. A universal testing machine was used for assessing the retention force, using the pull-off test in the existence of artificial saliva in-between the crowns. A higher score of retention force was noted at the beginning and after 540 cycles of insertion and elimination which mimicking 6 months of the clinical outcome of final retention. Obtained results were statistically evaluated. Results: Zirconia group conveyed the greatest initial force values. A combination of zirconia and PEEK was found to be effective. The final retention values of the PEEK and Zirconia groups were significantly decreased than initial values, while the insignificant loss of retention was observed with the Titanium group (P = 0.05). Conclusion: Zirconia (ZrO2 ) with PEEK combination is more preferred as a secondary telescopic. Despite the retention loss with time, even PEEK can be recommended as a secondary telescopic crown beside PEEK or ZrO2 primary crowns concerning the adequate early and final retention scores.