iomechanical evaluation of 3-unit fixed partial dentures on monotype and two-piece zirconia dental implant

Author(s)

Melo de Matos, Jefferson David ^[1] ; Scalzer Lopes, Guilherme da Rocha ^[1] ; Nomura Nakano, Leonardo Jiro ^[1] ; Ramos, Nathalia de Carvalho ^{[1, 2]} ; Lucena de Vasconcelos, John Eversong ^[3] ; Bottino, Marco Antonio ^[1] ; Mendes Tribst, Joao Paulo ^{[1, 4]}

Affiliation

^[1] Sao Paulo State Univ Unesp, Inst Sci & Technol, Dept Dent Mat & Prosthodont, Sao Jose Dos Campos, SP - Brazil

^[2] Univ Sao Francisco USF, Dept Dent, Braganca Paulista, SP - Brazil

^[3] Coll Dent CECAPE, Dept Implantol, Juazeiro Do Norte, Ceara - Brazil

^[4] Univ Taubate UNITAU, Dept Dent, Taubate, SP - Brazil

• Document type: Journal article
• Source: COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING; v. 25, n. 3 JUN 2021.
• Web of Science Citations: 2

Abstract

This study aimed to evaluate the biomechanical behavior, stress distributions and bone microstrain of fixed partial dentures (FPD) with ceramic abutments supported on monotype zirconia implants, titanium implants and two-piece zirconia implants, using finite element analysis. A three-dimensional model of the jaw was simulated containing 1.0 mm thick cortical bone and cancellous bone tissue. A FPD and implant models (4.1 x 10 mm) were modeled containing a cement-retained implant abutment. These models were replicated in three groups with similar geometries: Titanium Implant and Zirconia Abutment (Ti-Zr); Zirconia Implant and Zirconia Abutment (Zr-Zr) and Monotype Zirconia Implant (Zr-S). An axial load of 300 N was applied to the center of the first premolar. The microstrain (mu epsilon) and the Von-Mises stress (MPa) were assumed as failures criteria. For the three groups, a higher stress concentration was observed in the region of FPD connectors. The Ti-Zr group showed a higher stress concentration in the prosthesis and implant when compared to the other groups. However, the smaller elastic modulus of the titanium implant, in relation to the zirconia, provided a lower stress in the abutment and in the prosthetic screw. The monotype implant system allowed a more homogeneous stress distribution and its strain were predominantly located in the cervical region of the peri-implant bone tissue. Monotype or two-piece zirconia implants can be used for rehabilitation with FPD. However, the absence of separation between implant and abutment in the monotype system avoids the stress concentration in the prosthetic screw and reduced the peri-implant bone strain. (AU)

• 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