Analysis of stress distribution in different lateral occlusion patterns of All-on-4 fixed denture: A three-dimensional finite element study

Objective To analyze the effect of different lateral occlusion patterns on the stress distribution of All-on-4 implanted fixed dentures. Methods A model of All-on-4 implant fixed denture was established, and lateral balanced occlusion, group functional occlusion, and canine protection occlusion was simulated by changing the loading method. The selected loading force was 200 N vertically and 30 N horizontally. Results The maximum stress values of each part of the simulated balanced occlusion model were the smallest, while the maximum stress values of each part of the canine protection model were the largest. The maximum stress values of each part of the group functional occlusion model were slightly larger than those of the balanced occlusion model, but significantly smaller than those of the canine protection model. Conclusion Group function occlusion could be selected for the lateral occlusion in the final restoration of All-on-4 implant prosthesis.