Peri-implant stress distribution in maxillary All-on-4 prosthesis fabricated on multi-unit angled abutment with cobalt chromium framework versus those with titanium framework: A 3D Finite Element Analysis

Document Type : Original Article

Authors

1 MSc, Master Candidate, Master Implantology, Faculty of Dentistry, Cairo University

2 Lecturer, Department of Prosthodontics, Faculty of Dentistry, Cairo University, Egypt

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

4 Professor, Department of Prosthodontics, Faculty of Dentistry, Cairo University, Egypt

Abstract

Abstract
Aim: To use finite element analysis to evaluate the peri-implant stresses caused by the cobalt-chromium and titanium frameworks for maxillary all on four prostheses.
Material and methods: Three-dimensional finite elements modeling of an edentulous maxilla restored with a hybrid fixed prosthesis supported by four implants was done for this study. Anterior implants were placed vertically and bilaterally in the lateral-canine area. At the second premolar region, posterior implants were placed with a 17-degree distal angulation. Every implant featured a multi-unit abutment. The titanium framework for the first model was designed, and the cobalt-chromium framework for the second model was proposed.

Results: Von Mises stress, maximum stress, and directional deformation were assessed in the peri-implant bone area. Von Mises stresses on the screw-retained prosthesis were very similar in cobalt chromium and titanium frameworks compared to the underlying bone and implants.
Conclusion: For edentulous maxilla, the use of titanium or cobalt-chromium frameworks in conjunction with an all-on-four prosthesis is regarded as a dependable therapeutic alternative.

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Egyptian Dental Journal
Volume 70, Issue 4 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
October 2024
Pages 3391-3398

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