Influence of abutment-to-fixture design on reliability and failure mode of all-ceramic crown systems

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dc.contributor.authorDelben, Juliana A. [UNESP]
dc.contributor.authorBarao, Valentim A. R.
dc.contributor.authorFerreira, Mayara B. [UNESP]
dc.contributor.authorSilva, Nelson R. F. A. da
dc.contributor.authorThompson, Van P.
dc.contributor.authorAssunção, Wirley Goncalves [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionNYU
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.contributor.institutionUniversidade Federal de Minas Gerais (UFMG)
dc.contributor.institutionKings Coll London
dc.date.accessioned2014-12-03T13:10:43Z
dc.date.available2014-12-03T13:10:43Z
dc.date.issued2014-04-01
dc.description.abstractObjective. Evaluate the effect of implant connection designs on reliability and failure modes of screw-retained all-ceramic crowns.Methods. Central incisor ceramic crowns in zirconia abutments were screwed and torqued down to external hexagon (EH), internal hexagon (IH) and Morse taper (MT) implant systems. Single-load-to-fracture (SLF) test (n = 4 per group) determined three step-stress fatigue profiles with specimens assigned in the ratio of 3:2:1. Fatigue test was performed under water at 10 Hz. Use level probability Weibull curves and reliability for missions of 50,000 cycles at 400 N and 200 N were calculated (90% confidence bounds-CB). Weibull probability distribution (90% CB) was plotted (Weibull modulus vs characteristic strength) for comparison between the groups. Fractographic analyses were conducted under polarized-light microscopy and SEM.Results. Use level Weibull probability calculation indicated that failure was not associated with fatigue in groups EH (beta = 0.63), IH (beta = 0.97) and MT (beta = 0.19). Reliability data for a mission of 50,000 cycles at 400 N revealed significant reliability differences between groups EH (97%), IH (46%) and MT (0.5%) but no significant difference at 200 N between EH (100%) and IH (98%), and IH and MT (89%). Weibull strength distribution (figure) revealed beta = 13.1/eta = 561.8 for EH, beta = 5.8/eta = 513.4 for IH and beta = 5.3/eta = 333.2 for MT. Groups EH and IH exhibited veneer cohesive and adhesive failures. Group IH also presented adhesive failure at zirconia/titanium abutment insert while MT showed fracture at abutment neck.Significance. Although group EH presented higher reliability and characteristic strength followed by IH and MT, all groups withstood reported mean anterior loads. (C) 2014 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.en
dc.description.affiliationSao Paulo State Univ, Aracatuba Dent Sch, Dept Dent Mat & Prosthodont, Aracatuba, SP, Brazil
dc.description.affiliationNYU, Coll Dent, Dept Biomat & Biomimet, New York, NY USA
dc.description.affiliationUniv Estadual Campinas, Piracicaba Dent Sch, Dept Prosthodont & Periodontol, Piracicaba, SP, Brazil
dc.description.affiliationUniv Fed Minas Gerais, Coll Dent, Dept Restorat Dent, Belo Horizonte, MG, Brazil
dc.description.affiliationKings Coll London, Inst Dent, Dept Dent Mat, London, England
dc.description.affiliationUnespSao Paulo State Univ, Aracatuba Dent Sch, Dept Dent Mat & Prosthodont, Aracatuba, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 09/11491-0
dc.description.sponsorshipIdFAPESP: 09/15060-3
dc.format.extent408-416
dc.identifierhttp://dx.doi.org/10.1016/j.dental.2014.01.005
dc.identifier.citationDental Materials. Oxford: Elsevier Sci Ltd, v. 30, n. 4, p. 408-416, 2014.
dc.identifier.doi10.1016/j.dental.2014.01.005
dc.identifier.issn0109-5641
dc.identifier.lattes4438747643373395
dc.identifier.urihttp://hdl.handle.net/11449/112442
dc.identifier.wosWOS:000333287700007
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofDental Materials
dc.relation.ispartofjcr4.039
dc.relation.ispartofsjr2,106
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectReliabilityen
dc.subjectDental implantsen
dc.subjectZirconiaen
dc.subjectImplant-supported prosthesisen
dc.titleInfluence of abutment-to-fixture design on reliability and failure mode of all-ceramic crown systemsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes4438747643373395
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araçatubapt

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