The Effect of Different Bar Materials on Stress Distribution in Implant Supported Mandibular Overdenture Supporting Structure. (An in-Vitro Study)

Abstract

Objective: To study the effect of different bar materials (cobalt chromium & polyetheretherketone)on stress distribution in implant supported mandibular overdenture supporting structure .By using strain gauge analysis. Material and methods: Six bar attachments were made from different materials (cobalt chromium& polyetheretherketone)and were constructed in acrylic model for implant supported mandibular overdenture and determine stress distribution in implant and supporting structure by using strain gauge analysis. Results: Showing No statistically significant differencewas found between (CoCr) bars and (PEEK) bars on stress distribution in implantsupported mandibular overdenture supporting structure when Comparison betweenrecorded microstrains measured with unilateral and bilateral load application.Conclusion: The cobalt chromium bars are subjected to more stresses than polyetheretherketone.Significantly greater amount of stresses are transmitted to the implantswhether unilateral or bilateral in all loading situations. Unilateral loading is more traumatic to the implants and residual ridge compared to bilateral loading.