Abstract

Objective:

The aim of this study is to comparatively evaluate the stress values created by all-on-four prostheses of different types and weights on the implant, infrastructure, and peri-implant bone tissue under occlusal forces using the three-dimensional (3D) finite element analysis (FEA) method.

Methods:

A completely edentulous lower jaw model was designed in a computer environment using the FEA method, and implants were placed according to the all-on-four technique. Five different infrastructure materials were simulated in the 3D models, including chromium-cobalt (Cr-Co), titanium, zirconia, fiber, and polyetheretherketone (PEEK). The superstructure material of the prostheses was designed as monolithic zirconia crown and composite resin gingiva, which would be the same in all models. The weights of the created all-on-four prosthesis models were calculated. A rigid food material was used for a 100 newton (N) force application. Maximum principal (Pmax) and minimum principal (Pmin) stress values for cortical bone and Von mises stress values for the implant and infrastructure were calculated.

Results:

The weight of prostheses with different types of infrastructures affected the stress distribution in the implant, infrastructure, and peri-implant bone tissue. Lower stress values were observed in the implants and peri-implant bone tissues in Cr-Co, titanium, and zirconia infrastructures compared to fiber and PEEK. When the stresses occurring within the infrastructure materials were evaluated, lower stresses were obtained in fiber and PEEK infrastructures.

Conclusion:

Following the results of the biomechanical comparison made with 3D FEA, it can be said that long-term success can be achieved in the implant and the bone tissue around the implant as the elasticity modulus of the infrastructure material increases and the use of Cr-Co, titanium, and zirconia materials as infrastructures can be more advantageous. The weight of the modeled all-onfour prostheses did not reach harmful stress values in the bones around the implant together with the occlusal forces.

Cite this article as: Gömleksiz O, Altıntaş SH. Comparison of biomechanical effects of all-on-four implant prostheses with different types and weights: A three-dimensional finite element analysis. Arch Basic Clin Res. 2025;7(1):58-67.