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Mechanical strength and subcritical crack growth under wet cyclic loading of glass-infiltrated dental ceramics

dc.contributor.authorSalazar Marocho, Susana M. [UNESP]
dc.contributor.authorStudart, Andre R.
dc.contributor.authorBottino, Marco A. [UNESP]
dc.contributor.authorDella Bona, Alvaro
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionSwiss Fed Inst Technol
dc.contributor.institutionUniv Passo Fundo
dc.date.accessioned2014-05-20T15:32:23Z
dc.date.available2014-05-20T15:32:23Z
dc.date.issued2010-05-01
dc.description.abstractObjectives. Evaluate the flexural strength (sigma) and subcritical crack growth (SCG) under cyclic loading of glass-infiltrated alumina-based (IA, In-Ceram Alumina) and zirconia-reinforced (IZ, In-Ceram Zirconia) ceramics, testing the hypothesis that wet environment influences the SCG of both ceramics when submitted to cyclic loading.Methods. Bar-shaped specimens of IA (n = 45) and IZ ( n = 45) were fabricated and loaded in three-point bending (3P) in 37 degrees C artificial saliva (IA(3P) and IZ(3P)) and cyclic fatigued (F) in dry (D) and wet (W) conditions (IA(FD), IA(FW), IZ(FD), IZ(FW)). The initial sigma and the number of cycles to fracture were obtained from 3P and F tests, respectively. Data was examined using Weibull statistics. The SCG behavior was described in terms of crack velocity as a function of maximum stress intensity factor (K(Imax)).Results. The Weibull moduli (m = 8) were similar for both ceramics. The characteristic strength (sigma(0)) of IA and IZ was and 466 MPa 550 MPa, respectively. The wet environment significantly increased the SCG of IZ, whereas a less evident effect was observed for IA. In general, both ceramics were prone to SCG, with crack propagation occurring at K(I) as low as 43-48% of their critical K(I). The highest sigma of IZ should lead to longer lifetimes for similar loading conditions.Significance. Water combined with cyclic loading causes pronounced SCG in IZ and IA materials. The lifetime of dental restorations based on these ceramics is expected to increase by reducing their direct exposure to wet conditions and/or by using high content zirconia ceramics with higher strength. (C) 2010 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.en
dc.description.affiliationSão Paulo State Univ, UNESP, Dept Dent Mat & Prosthodont, São Paulo, Brazil
dc.description.affiliationSwiss Fed Inst Technol, Dept Mat, CH-8093 Zurich, Switzerland
dc.description.affiliationUniv Passo Fundo, Sch Dent, Passo Fundo, RS, Brazil
dc.description.affiliationUnespSão Paulo State Univ, UNESP, Dept Dent Mat & Prosthodont, São Paulo, Brazil
dc.format.extent483-490
dc.identifierhttp://dx.doi.org/10.1016/j.dental.2010.01.007
dc.identifier.citationDental Materials. Oxford: Elsevier B.V., v. 26, n. 5, p. 483-490, 2010.
dc.identifier.doi10.1016/j.dental.2010.01.007
dc.identifier.issn0109-5641
dc.identifier.lattes9234456003563666
dc.identifier.urihttp://hdl.handle.net/11449/41300
dc.identifier.wosWOS:000275815300011
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.subjectGlass-infiltrated ceramicen
dc.subjectCyclic fatigueen
dc.subjectSubcritical crack growthen
dc.subjectStrengthen
dc.subjectWeibull statisticsen
dc.titleMechanical strength and subcritical crack growth under wet cyclic loading of glass-infiltrated dental ceramicsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes9234456003563666
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Ciência e Tecnologia, São José dos Campospt
unesp.departmentMateriais Odontológicos e Prótese - ICTpt

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