Influence of Abutment Design on Biomechanical Behavior to Support a Screw-Retained 3-Unit Fixed Partial Denture

Author(s)

Scalzer Lopes, Guilherme da Rocha ; Melo de Matos, Jefferson David ; Queiroz, Daher Antonio ; Mendes Tribst, Joao Paulo ; Ramos, Nathalia de Carvalho ; Rocha, Mateus Garcia ; Barbosa, Adriano Baldotto ; Bottino, Marco Antonio ; Souto Borges, Alexandre Luiz ; Nishioka, Renato Sussumu

• Document type: Journal article
• Source: MATERIALS; v. 15, n. 18, p. 18-pg., 2022-09-01.

Abstract

This study aimed to evaluate the biomechanical behavior of Morse taper implants using different abutments (CMN abutment [(CMN Group] and miniconical abutments [MC Group]), indicated to support a screw-retained 3-unit fixed partial denture. For the in vitro test, polyurethane blocks were fabricated for both groups (n = 10) and received three implants in the "offset" configuration and their respective abutments (CMN or MC) with a 3-unit fixed partial denture. Four strain gauges were bonded to the surface of each block. For the finite element analysis, 3D models of both groups were created and exported to the analysis software to perform static structural analysis. All structures were considered homogeneous, isotropic, and elastic. The contacts were considered non-linear with a friction coefficient of 0.3 between metallic structures and considered bonded between the implant and substrate. An axial load of 300 N was applied in three points (A, B, and C) for both methods. The microstrain and the maximum principal stress were considered as analysis criteria. The obtained data were submitted to the Mann-Whitney, Kruskal-Wallis, and Dunn's multiple comparison test (alpha = 5%). The results obtained by strain gauge showed no statistical difference (p = 0.879) between the CMN (645.3 +/- 309.2 mu epsilon) and MC (639.3 +/- 278.8 mu epsilon) and allowed the validation of computational models with a difference of 6.3% and 6.4% for the microstrains in the CMN and MC groups, respectively. Similarly, the results presented by the computational models showed no statistical difference (p = 0.932) for the CMN (605.1 +/- 358.6 mu epsilon) and MC (598.7 +/- 357.9 mu epsilon) groups. The study concluded that under favorable conditions the use of CMN or MP abutments to support a fixed partial denture can be indicated. (AU)

• FAPESP's process: 21/11499-2 - Biomechanical behavior and fatigue survival of two: piece titanium and zirconia implants supporting zirconia single crowns
• Grantee: Jefferson David Melo de Matos
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 19/24903-6 - Comparative analysis between titanium implants and polycrystalline ceramics in survival on fatigue and biomechanical behavior
• Grantee: Jefferson David Melo de Matos
• Support Opportunities: Scholarships in Brazil - Doctorate