Stress Distribution in Implant-Supported Fixed Dental Prosthesis (Pontic Design) using Two Different Framework Materials: A Finite Element Analysis

Abstract

Aim and Objectives: The stresses transferred from the implant to the surrounding bone greatly influence the clinical outcome of the implant-supported prosthesis. The role of implant-supported prostheses made from zirconia and polyether ether ketone (PEEK) material in transferring stresses is not much known. The purpose of the finite element analysis study was to evaluate stress distribution in an implant-supported fixed dental prosthesis (FDP) using two different framework materials. Materials and Methods: Two three-dimensional models of implant-supported FDPs were designed using ANSYS software, with implants in right maxillary central incisor and canine regions supporting a three-unit fixed partial denture. Model 1 was made using zirconia as a framework material and model 2 using PEEK as a framework material. A static load of 100 N was applied in two directions, i.e., vertically and obliquely at an angle of 30° along the long axis of the implant. The von Mises stress analysis was done to find stresses generated in implants and the prosthesis, and the maximum and minimum principal stress analyses were used to find the stress generated in the bone. Results: Under both the loading conditions, maximum stress concentration was observed in the connector region of model 1 (zirconia group) compared to model 2 (PEEK group); 6.28 MPa versus 2.17 MPa in vertical loading and 8.85 MPa versus 2.69 MPa in oblique loading, respectively. The stresses generated in bone were nearly similar in both models. Conclusion: The framework material does affect the load-bearing capacity of the prosthesis. Stresses observed with PEEK as framework material were lesser compared to zirconia. Therefore, PEEK can be considered a suitable framework material for implant-supported FDPs.