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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Fatigue Failure of External Hexagon Connections on Cemented Implant-Supported Crowns

Texto completo
Autor(es):
Barbosa, Joao Malta [1, 2] ; da Rocha, Daniel Navarro [3] ; Hirata, Ronaldo [4] ; Freitas, Gileade [5] ; Bonfante, Estevam A. [6] ; Coelho, Paulo G. [7]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] NYU, Dept Prosthodont, New York, NY - USA
[2] NYU, Coll Dent, Dept Biomat & Biomimet, 433 1st Ave, Room 844, New York, NY 10010 - USA
[3] Mil Inst Engn, Dept Mat Sci, Rio De Janeiro, RJ - Brazil
[4] NYU, Dept Biomat & Biomimet, New York, NY - USA
[5] Univ Sao Paulo, Ribeirao Preto Dent Sch, Dept Oral & Maxillofacial Surg, Ribeirao Preto, SP - Brazil
[6] Univ Sao Paulo, Bauru Sch Dent, Dept Prosthodont & Periodontol, Bauru, SP - Brazil
[7] NYU, Tandon Sch Engn, Hansjorg Wyss Dept Plast Surg, Mech & Aerosp Engn, Dept Biomat & Biomimet, Langone Med Ctr, New York, NY - USA
Número total de Afiliações: 7
Tipo de documento: Artigo Científico
Fonte: IMPLANT DENTISTRY; v. 27, n. 2, p. 165-170, APR 2018.
Citações Web of Science: 1
Resumo

Purpose: To evaluate the probability of survival and failure modes of different external hexagon connection systems restored with anterior cement-retained single-unit crowns. The postulated null hypothesis was that there would be no differences under accelerated life testing. Materials and Methods: Fiftyfour external hexagon dental implants (similar to 4 mm diameter) were used for single cement-retained crown replacement and divided into 3 groups: (3i) Full OSSEOTITE, Biomet 3i (n = 18); (OL) OEX P4, Osseolife Implants (n = 18); and (IL) Unihex, Intra-Lock International (n = 18). Abutments were torqued to the implants, and maxillary central incisor crowns were cemented and subjected to step-stress-accelerated life testing in water. Use-level probability Weibull curves and probability of survival for a mission of 100,000 cycles at 200 N (95% 2-sided confidence intervals) were calculated. Stereo and scanning electron microscopes were used for failure inspection. Results: The beta values for 3i, OL, and IL (1.60, 1.69, and 1.23, respectively) indicated that fatigue accelerated the failure of the 3 groups. Reliability for the 3i and OL (41% and 68%, respectively) was not different between each other, but both were significantly lower than IL group (98%). Abutment screw fracture was the failure mode consistently observed in all groups. Conclusion: Because the reliability was significantly different between the 3 groups, our postulated null hypothesis was rejected. (AU)

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
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
Processo FAPESP: 16/18818-8 - EMU concedido no processo 2012/19078-7: ElectroPuls E3000 Linear-Torsion All-Electric dynamic test instrument package
Beneficiário:Estevam Augusto Bonfante
Linha de fomento: Auxílio à Pesquisa - Programa Equipamentos Multiusuários