Probability of survival and stress distribution of narrow diameter implants with different implant-abutment taper angles
| Autor: | Estevam A. Bonfante, Raissa Micaella Marcello-Machado, Rafael Soares Gomes, Altair Antoninha Del Bel Cury, Mariana Itaborai Moreira Freitas, Mirelle Maria Ruggiero, Edmara T.P. Bergamo |
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| Rok vydání: | 2022 |
| Předmět: |
Dental Implants
Dental Stress Analysis REPRODUTIBILIDADE DE RESULTADOS Materials science Finite Element Analysis Biomedical Engineering Reproducibility of Results Dental Implant-Abutment Design Biomechanical Phenomena Accelerated life testing Biomaterials Stress (mechanics) medicine.anatomical_structure Materials Testing medicine Cortical bone Stress Mechanical Implant Failure mode and effects analysis Abutment (dentistry) Probability Weibull distribution Stress concentration Biomedical engineering |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | This study evaluated the probability of survival, failure mode, and stress distribution of narrow diameter implants (NDIs) with internal implant-abutment conical connection comprised of different taper angles and thread designs. Sixty-three NDIs (O 3.5 × 8.5 mm) were divided according to the taper angle (TA), internal diameter (ID), and trapezoidal thread design (TD) (n = 21/group), as follows: (a) 11.5°U (11.5° TA; ID: 2.5 mm; TD: dual threaded); (b) 11.5°S (11.5° TA; ID: 2.5 mm; TD: single threaded); (c) 16°S (16° TA; ID: 2.72 mm; TD: single threaded). They were subjected to step-stress accelerated life testing. The reliability and use-level probability Weibull curves were calculated at 50, 100, and 150 N for a mission of 100,000 cycles and the failure mode was analyzed using a scanning electron microscope. For finite element analysis the von-Mises stress (σvM ) was calculated for the abutment and implant. All groups showed high reliability (above 84%) and failures occurred predominantly in the abutment. In the FEA, 11.5°U showed higher σvM for the implant. All NDIs showed high reliability at clinically challenging loads. The system with greater taper angle showed lower σVm in the implant, and dual threaded implants showed a higher stress concentration in the implant and cortical bone. |
| Databáze: | OpenAIRE |
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