Journal of AdvancedMedical and Dental Sciences Research

Background: The stabilization of the lower denture with two interforaminal implants has provided reliable and predictable treatment outcomes. The present study assessed the retentive capacity of attachment systems in implant‑retained overdentures. Materials & Methods: Edentulous mandibular models were made with heat-cured polymethyl methacrylate resin. Acrylic resin mandibular overdentures were fabricated and provision was made to receive three different overdenture attachment systems, prefabricated ball/o-ring attachment, Hader bar and clip attachment and Locator® implant overdenture attachment stud type. Using a universal testing machine, each of the models were subjected to 100 pulls. Results: Group I had Ball/o-ring attachment, group II had Bar and clip attachment and group III had Locator attachment. There was significant difference in retentive forces before and after thermocycling in all groups. Inter group comparison also revealed significant difference (P< 0.05). Conclusion: Authors found that the bar and clip attachment exhibited the highest peak as well as the highest mean retention force. Key words: Thermocycling, Retentive, implant‑retained overdentures