Abstract
Purpose: This study aimed to evaluate the stress distribution and microgap formation in implant assemblies with conical abutments made of different materials under an oblique load. Materials and methods: The mechanical behavior of an implant assembly with a titanium abutment was analyzed and compared with that of an assembly with a Y-TZP abutment using finite element analysis (FEA). A torque of 20 Ncm was first applied to the abutment screw, followed by oblique loads of 10 N–280 N applied to the prosthesis placed on the implant. The maximum stress in the abutment screw, the microgap formation process, and the critical load for bridging the internal implant space were evaluated. Results: No significant difference in stress distribution between the two cases was observed, with the stresses being mainly concentrated at the top half of the screw (the predicted maximum von Mises stress was approximately 1200 MPa at 280 N). The area in contact at the implant-to-abutment interface decreased with increasing load for both abutments, with the critical load for bridging the internal implant space being roughly 140 N. The maximum gap size being was approximately 470 μm with either abutment. Conclusion: There was no significant difference in the stress distribution or microgap formed between implant assemblies with titanium and Y-TZP abutments having an internal conical connection.
Original language | English (US) |
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Article number | 105847 |
Journal | Journal of the Mechanical Behavior of Biomedical Materials |
Volume | 142 |
DOIs | |
State | Published - Jun 2023 |
Bibliographical note
Funding Information:The authors would like to acknowledge the Minnesota Supercomputer Institute (MSI), University of Minnesota for the provision of finite element software, and Mozo Grau, Valladolid, Spain for providing the implant and abutment samples. Bruna Tonin would like to thank the Brazilian Federal Agency for Support and Evaluation of Graduate Education within the Ministry of Education of Brazil for financially supporting her ( CAPES N° 88881–187982/2018-01 ) and the Minnesota Dental Research Center for Biomaterials and Biomechanics for hosting her visit, during which this study was performed.
Funding Information:
The authors would like to acknowledge the Minnesota Supercomputer Institute (MSI), University of Minnesota for the provision of finite element software, and Mozo Grau, Valladolid, Spain for providing the implant and abutment samples. Bruna Tonin would like to thank the Brazilian Federal Agency for Support and Evaluation of Graduate Education within the Ministry of Education of Brazil for financially supporting her (CAPES N° 88881–187982/2018-01) and the Minnesota Dental Research Center for Biomaterials and Biomechanics for hosting her visit, during which this study was performed.
Publisher Copyright:
© 2023 Elsevier Ltd
Keywords
- Bending moments
- Computer-aided design
- Computer-assisted manufacture
- Finite element analysis
- Implant-supported dental prosthesis
- Prosthodontics
PubMed: MeSH publication types
- Journal Article
- Research Support, Non-U.S. Gov't