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
Nashaat, E., Elkady, D., Abdallah, M., Swelem, A. (2024). 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. EKB Journal Management System, 70(4), 3493-3503. doi: 10.21608/edj.2024.299183.3092
Ehab Nashaat; Doaa Mahmoud Elkady; Mohamed Farouk Abdallah; Amal Swelem. "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". EKB Journal Management System, 70, 4, 2024, 3493-3503. doi: 10.21608/edj.2024.299183.3092
Nashaat, E., Elkady, D., Abdallah, M., Swelem, A. (2024). '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', EKB Journal Management System, 70(4), pp. 3493-3503. doi: 10.21608/edj.2024.299183.3092
Nashaat, E., Elkady, D., Abdallah, M., Swelem, A. 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. EKB Journal Management System, 2024; 70(4): 3493-3503. doi: 10.21608/edj.2024.299183.3092

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, Page 3493-3503  XML PDF (2.3 MB)
Document Type: Original Article
DOI: 10.21608/edj.2024.299183.3092
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Authors
Ehab Nashaat email orcid 1; Doaa Mahmoud Elkadyorcid 2; Mohamed Farouk Abdallahorcid 3; Amal Swelemorcid 4
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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