Finite element analysis on implant-supported bar with different geometric shapes

BackgroundThe selection guideline for the implant-supported bar connectors (ISBC) of hybrid denture is lacking. This study investigated the maximum von Mises stress (vMS), stress distribution, and displacement of various geometric ISBC in mandibular hybrid dentures, as well as the maximum principal stress (sigma max) in the acrylic resin part, through finite element analysis.MethodsFour different geometric cross-sectional patterns for mandibular ISBC-L, Y, I, and Square-of equal volume, based on the "All-on-4" concept, were created. Titanium alloy was used for ISBC with an acrylic resin wraparound. Models were integrated into the software and loading simulations mimicking mastication forces on posterior teeth in centric and eccentric loadings were performed. vMS was used for ISBC assessment, and sigma max was assessed in acrylic resin.ResultsIn centric loading, vMS was mainly at the distal screw channel across most ISBCs. Y ISBC showed the least vMS, while I and Square ISBC demonstrated uniform stress distribution on both sides; load and non-load-bearing sides. The others showed concentrated vMS only on the load-bearing side. Square ISBC exhibited the most displacement. In the acrylic resin region of each, sigma max was found concentrated around the contact point between two adjacent denture teeth at different locations, with Square showing the highest sigma max. Under eccentric loading, the maximum vMS of each model was found at the interface between the distal screw channel and the lingual aspect of the abutment, with comparable vMS. Square ISBC experienced the most significant displacement and showed the highest sigma max within the acrylic resin juxtaposed with the screw channel.ConclusionThe Y model of titanium-alloy in mandibular ISBC demonstrated the lowest vMS and displacement.