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 | ||
| Egyptian Dental Journal | ||
| Volume 70, Issue 4, October 2024, Pages 3493-3503 PDF (2.3 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/edj.2024.299183.3092 | ||
| Authors | ||
| Ehab Nashaat* 1; Doaa Mahmoud Elkady2; Mohamed Farouk Abdallah3; Amal Swelem4 | ||
| 1MSc, Implant Department, Faculty of Dentistry, Cairo University, Cairo, Egypt | ||
| 2Lecturer of Prosthodontics, Faculty of Dentistry, Cairo University. | ||
| 3Professor, Department of Prosthodontics, Faculty of Dentistry, Cairo University; Professor, Department of Prosthodontics, Faculty of Dentistry, Galala University, Egypt | ||
| 4Professor 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. | ||
| Keywords | ||
| Maximum principal stress; Screw retained implant restorations; multi-unit abutment; Finite element analysis; Von Mises stress | ||
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