Effect of implant connection and restoration design (screwed vs. cemented) in reliability and failure modes of anterior crowns
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Data
2011-08-01
Autores
Freitas Júnior, Amilcar C. [UNESP]
Bonfante, Estevam A.
Rocha, Eduardo Passos [UNESP]
Silva, Nelson R. F. A.
Marotta, Leonard
Coelho, Paulo G.
Título da Revista
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Editor
Wiley-Blackwell
Resumo
The mechanical performance of cemented or screw-retained implant-supported crowns with an internal or external configuration is yet to be understood. This in vitro study evaluated the effect of screw-retained and cement-retained prostheses on internal and external implant-abutment connections. Thereby, the reliability and failure modes of crowns were investigated. Eighty-four implants (Emfils; Colosso Evolution system) were divided into four groups (n = 21 each): screw-retained and internal connection (Si), screw-retained and external connection (Se), cement-retained and internal connection (Ci), and cement-retained and external connection (Ce). Ti-6Al-4V abutments were torqued (30 Ncm) to the implants, and maxillary central incisor metal crowns were torqued (30 Ncm) or cemented (Rely X Unicem; 3M-ESPE) and subjected to accelerated life-testing in water. Use-level probability Weibull curves and reliability for 50,000 cycles at 150 N were calculated. The beta values for Si (1.72), Se (1.50), Ci (1.34), and Ce (1.77) groups indicated that fatigue/damage accumulation accelerated their failure. The Ci group presented the highest reliability, the Se group presented the lowest reliability, and Si and Ce groups presented intermediate reliability. Screw-retained restorations presented mainly abutment fracture. Cement-retained restorations resulted in failures of the screw in the Ce group, but implant/screw fracture in the Ci group.
Descrição
Palavras-chave
cement-retained, fractography, implant-supported prostheses, reliability, screw-retained
Como citar
European Journal of Oral Sciences. Malden: Wiley-blackwell, v. 119, n. 4, p. 323-330, 2011.