Peri-implant stress distribution in mandibular All-on-4 prostheses fabricated on multi-unit abutments with cobalt chromium framework versus those with zirconia framework: A 3D Finite Element Analysis

Document Type : Original Article

Authors

1 MSc, Implant Department, Faculty of Dentistry, Cairo University, Cairo, Egypt

2 Lecturer of Prosthodontics, Faculty of Dentistry, Cairo University.

3 Professor, Department of Prosthodontics, Faculty of Dentistry, Cairo University; Professor, Department of Prosthodontics, Faculty of Dentistry, Galala University, Egypt

4 Professor of Prosthodontics, Faculty of Dentistry, Cairo University

Abstract

Abstract

Aim: To assess the peri-implant stresses produced by cobalt chromium and zirconium frameworks for mandibular prosthesis using finite element analysis.

Material and methods: This investigation was performed using three-dimensional finite element models of an edentulous mandible restored with a prosthesis supported by four implants. While the posterior implants were positioned at the second premolar location with a 17-degree distal angulation, the anterior implants were positioned vertically and bilaterally in the lateral-canine area. All of the implants had multi-unit abutments. For the first model, a zirconia framework was constructed, while a cobalt-chromium framework was envisaged for the second. Assessments were made of the directional deformation, maximum principal stresses, and Von Misses stresses.

Results: Von Mises stress, maximum principal stress, and directional deformation were assessed in the peri-implant bone area. Von Mises stresses, maximum principal stress and directional deformation on the screw-retained prosthesis were very similar in cobalt chromium and zirconium frameworks compared to the underlying bone and implants.

Conclusion: Zirconium frameworks are comparable to cobalt-chromium frameworks as regards the stresses induced at the per-implant bone, they showed comparable deformation values at the fixation screws.

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Egyptian Dental Journal
Volume 70, Issue 4 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
October 2024
Pages 3493-3503

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