Abstract: Objective To discuss the most suitable polymerization angle of double-implant-supported mandibular molar restoration under dynamic loads. Methods Three-dimensional finite element models of mandibular molars with double angles of 0°, 5°, 10° and 15° were established, and a dynamic load of 0.875 s was applied to the restoration. The stress distributions of the bone tissue and the displacement values of the implant-abutment complex were analyzed. Results ①The maximum Von-Mises of cortical bone around the implant: 5° polymerization angle model> 10° polymerization angle model>15° polymerization angle model>0° polymerization angle model. The maximum Von-Mises of cancellous bone around the implant: 15° polymerization angle model> 10° polymerization angle model>5° polymerization angle model>0° polymerization angle model. ②The maximum displacement of the implant-abutment complex: 15° polymerization angle model>5° polymerization angle model>10° polymerization angle model>0°polymerization angle model. Conclusion The most suitable polymerization angle of double-implant-supported mandibular molar restoration is 0° under dynamic loads.

Key words: finite element analysis, dynamic loads, double implant, mandibular molar