Peri-implant stress distribution in maxillary "All-on-4" prostheses fabricated on multi-unit angled abutments with cobalt chromium framework versus those with polyether ketone (PEEK) framework: A 3D Finite Element Analysis.

Document Type : Original Article

Authors

1 Department of Implantology, Faculty of Dentistry, Cairo University, Cairo, Egypt

2 Department of prosthodontics, Faculty of Dentistry, Cairo University, Cairo, Egypt.

Abstract

Aim: To assess the peri-implant stresses produced by a maxillary all-on-four prosthesis using Peek frameworks and cobalt-chromium finite element analysis.
Methodology: This analysis was performed using three-dimensional finite element models of an edentulous maxilla repaired 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. A Peek framework was designed for the first model, while a cobalt-chromium framework was intended for the second.
Results: The Von Mises stress, Maximum stress, and directional deformation were assessed in the peri-implant bone area. Under axial loads, both the PEEK framework and screw-retained prosthesis recorded lower Von Mises stress, and the Maximum Principal stress on the bone was also lower in PEEK compared to CoCr. Under oblique loads, the PEEK framework showed higher Von Mises stresses compared to CoCr for the screw-retained prosthesis, as well as higher Extreme principal stress on the bone, and directional deformation of bolts, impacting the underlying bone in addition the installed implants.
Conclusion: For the edentulous maxilla, using cobalt chromium or peek frameworks with an all-on-four prosthesis is thought to be a dependable course of treatment.
Keywords: frameworks, stress, cobalt chromium, PEEK, implant.

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Advanced Dental Journal
Volume 7, Issue 2
April 2025
Pages 147-160

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