robability of survival and stress distribution of narrow diameter implants with different implant-abutment taper angle

Autor(es)

Freitas, Mariana I. M. ^[1] ; Gomes, Rafael S. ^[1] ; Ruggiero, Mirelle M. ^[1] ; Bergamo, Edmara T. P. ^[2] ; Bonfante, Estevam A. ^[2] ; Marcello-Machado, Raissa M. ^[1] ; Del Bel Cury, Altair A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Dept Prosthodont & Periodontol, Piracicaba Dent Sch, Limeira Ave 901, Piracicaba, SP - Brazil

^[2] Univ Sao Paulo, Dept Prosthodont & Periodontol, Bauru Sch Dent, Bauru, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS; v. 110, n. 3 SEP 2021.
• Citações Web of Science: 0

Resumo

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 x 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 degrees U (11.5 degrees TA; ID: 2.5 mm; TD: dual threaded); (b) 11.5 degrees S (11.5 degrees TA; ID: 2.5 mm; TD: single threaded); (c) 16 degrees S (16 degrees 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 (sigma(vM)) 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 degrees U showed higher sigma(vM) for the implant. All NDIs showed high reliability at clinically challenging loads. The system with greater taper angle showed lower sigma(Vm) in the implant, and dual threaded implants showed a higher stress concentration in the implant and cortical bone. (AU)

• Processo FAPESP: 19/08693-1 - Compósitos experimentais à base de alumina e zircônia infiltrados por vidro: caracterização microestrutural e das propriedades ópticas e mecânicas.
• Beneficiário: Edmara Tatiely Pedroso Bergamo
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/19078-7 - Desenvolvimento e processamento de compósito de Al2O3-ZrO2 para próteses monolíticas CAD/CAM: efeito do envelhecimento na resistência à flexão biaxial
• Beneficiário: Estevam Augusto Bonfante
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores