Effect of grinding and resintering on the fatigue limit and surface characterization of a Y-TZP ceramic

dc.contributor.authorPolli, Gabriela Scatimburgo [UNESP]
dc.contributor.authorHatanaka, Gabriel Rodrigues [UNESP]
dc.contributor.authorAbi-Rached, Filipe De Oliveira [UNESP]
dc.contributor.authorPinelli, Lígia Antunes Pereira [UNESP]
dc.contributor.authorGóes, Márcio De Sousa
dc.contributor.authorCesar, Paulo Francisco
dc.contributor.authorReis, José Maurício dos Santos Nunes [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUNILA - Universidade Federal da Integração Latino-Americana
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2018-12-11T17:05:54Z
dc.date.available2018-12-11T17:05:54Z
dc.date.issued2016-07-01
dc.description.abstractThis study evaluated the effect of grinding protocols and resintering on flexural fatigue limit and surface characterization of Lava™M Y-TZP. Bar-shaped specimens (20×4.0×1.2 mm, n=40; 20×4.0×1.5 mm, n=80) were obtained. Half of the thinner specimens (1.2 mm) constituted the as-sintered group (AS), while the thicker ones (1.5 mm) were ground with diamond burs under irrigation (WG) or not (G). The other half of thinner and half of ground specimens were resintered (1000 ºC, 30 min), forming the groups ASR, WGR and GR. Fatigue limit (500,000 cycles, 10 Hz) was evaluated by staircase method in a 4-point flexural fixture. Data were analyzed by 2-way ANOVA and Tukey’s test (α=0.05). Surface topography (n=3) and fracture area (n=3) were evaluated by SEM. X-ray diffraction data (n=1) was analyzed by Rietveld refinement. ANOVA revealed significant differences (p<0.001) for the grinding protocol, resintering and their interaction. Grinding increased the fatigue limit of non-resintered groups. There was no significant difference among the resintered groups. Resintering significantly increased the fatigue limit of the AS group only. Both protocols created evident grooves on zirconia surface. The failures initiated at the tensile side of all specimens. The percentages (wt%) of monoclinic phase were AS (8.6), ASR (1.2), G (1.8), GR (0.0), WG (8.2), WGR (0.0) before, and AS (7.4), ASR (6.5), G (3.2), GR (0.2), WG (4.6), WGR (1.1) after cyclic loading. Grinding increased the fatigue limit of non-resintered Y-TZP and formed evident grooves on its surface. Resintering provided significant increase in the fatigue limit of as-sintered specimens. In general, grinding and resintering decreased or zeroed the monoclinic phase.en
dc.description.affiliationDepartment of Dental Materials and Prosthodontics Araraquara Dental School UNESP - Univ Estadual Paulista
dc.description.affiliationUNILA - Universidade Federal da Integração Latino-Americana
dc.description.affiliationDepartment of Biomaterials and Oral Biology Dental School USP - Universidade de São Paulo
dc.description.affiliationUnespDepartment of Dental Materials and Prosthodontics Araraquara Dental School UNESP - Univ Estadual Paulista
dc.format.extent468-475
dc.identifierhttp://dx.doi.org/10.1590/0103-6440201600801
dc.identifier.citationBrazilian Dental Journal, v. 27, n. 4, p. 468-475, 2016.
dc.identifier.doi10.1590/0103-6440201600801
dc.identifier.fileS0103-64402016000400468.pdf
dc.identifier.issn1806-4760
dc.identifier.issn0103-6440
dc.identifier.lattes0455968557454133
dc.identifier.lattes3000945612440374
dc.identifier.orcid0000-0001-5834-105X
dc.identifier.scieloS0103-64402016000400468
dc.identifier.scopus2-s2.0-84988322450
dc.identifier.urihttp://hdl.handle.net/11449/173496
dc.language.isoeng
dc.relation.ispartofBrazilian Dental Journal
dc.relation.ispartofsjr0,476
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectFatigue limit
dc.subjectGrinding
dc.subjectResintering
dc.subjectStaircase method
dc.subjectZirconia
dc.titleEffect of grinding and resintering on the fatigue limit and surface characterization of a Y-TZP ceramicen
dc.typeArtigo
unesp.author.lattes0455968557454133
unesp.author.lattes3000945612440374[6]
unesp.author.orcid0000-0001-5834-105X[6]

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