Evaluation of Stresses on Mandible Bone and Prosthetic Parts in Fixed Prosthesis by Utilizing CFR-PEEK, PEKK and PEEK Frameworks

Introduction: Fixed prosthesis is an appropriate solution for edentulous patients. In fixed prostheses, following “All on four”, titanium frameworks are commonly used to support the implants. However, the limitations of titanium have prompted the researchers to search for alternative materials (e.g. polymers). The success of fixed prosthesis is predicted to be influenced also by bone quality, particularly spongy bone density. Purpose: This study applied finite element investigations to evaluate the stress distribution in the parts of fixed prosthesis and the surrounding bone tissue, using polymeric frameworks in place of titanium, and different densities of spongy bone. Materials: &Methods: Fixed prosthesis was constructed on edentulous mandible, then different frameworks (CFR-PEEK 60%, CFR-PEEK30%, PEKK, and PEEK) were stimulated instead of titanium, using different densities of spongy bone, under 300N unilateral force. Results: : The choice of framework material depended on the density of spongy bone. Moreover, PEEK framework showed the lowest stress values on bone tissues and the highest stress values on the mucosa. Conclusions: : All frameworks could be used in the fixed prosthesis, in the cases of normal and high densities of spongy bone. In low-density case, soft frameworks (PEKK & PEEK) were recommended to reduce the stresses generated on bone tissues.