Effect of surface and heat treatments on the biaxial flexural strength and phase transformation of a y-tzp ceramic

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dc.contributor.authorFonseca, Renata Garcia [UNESP]
dc.contributor.authorAbi-Rached, Filipe de Oliveira
dc.contributor.authorSilva, Felipe Samuel Correia Pereira da
dc.contributor.authorHenriques, Bruno Alexandre Pacheco de Castro
dc.contributor.authorPinelli, Lígia Antunes Pereira
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2015-08-06T16:13:07Z
dc.date.available2015-08-06T16:13:07Z
dc.date.issued2014
dc.description.abstractTo evaluate the effect of grinding and airborne-particle abrasion on the biaxial flexural strength (BFS) and phase transformation of a Y-TZP ceramic, and examine whether sintering the veneering porcelain renders the previous heat treatment recommended by the manufacturer unnecessary. Materials and Methods: Lava zirconia specimens (N = 108) were obtained with the following dimensions: 14.0 mm diameter × 1.3 mm thickness (n = 36) and 14.0 mm × 1.6 mm (n = 72). The thicker specimens were ground with diamond burs under irrigation and received (heat-treated groups) or not (non-heat-treated groups) a heat treatment (1000°C for 30 min) prior to the four firing cycles applied to simulate the sintering of the veneering porcelain. All specimens were air abraded as follows (n = 12): 1) 30-μm silica-modified Al2O3 particles (Rocatec Soft); 2) 110-μm silica-modified Al2O3 particles (Rocatec Plus); and 3) 120-μm Al2O3 particles, followed by Rocatec Plus. Three specimens of each group were analyzed by x-ray diffraction (XRD) to assess the monoclinic phase content (%). The BFS test was performed in a mechanical testing machine (Instron 8874). Data (MPa) were analyzed by two-way ANOVA (grinding × airborne-particle abrasion and heat treatment × airborne-particle abrasion) and Tukey's post-hoc test (α = 0.05). The strength reliability was analyzed using the Weibull distribution. Results: Grinding significantly decreased the BFS of the non-heat-treated groups (p < 0.01). Within the ground groups, the previous heat treatment did not influence the BFS (p > 0.05). Air abrasion only influenced the BFS of the ground/heat-treated groups (p < 0.01). For the non-heat-treated groups, the grinding did not decrease the Weibull modulus (m), but it did decrease the characteristic strength (σ0). For Rocatec Soft and 120-μm Al2O3 particles + Rocatec Plus, the heat-treated groups presented lower m and higher σ0 than the ground/non-heat-treated groups. The independent variables did not seem to influence phase transformation. Air-abraded surfaces presented higher monoclinic zirconia content than the as-sintered and ground surfaces, which exhibited similar content. Conclusion: Even under irrigation, grinding compromised the Y-TZP ceramic strength. The sintering of the veneering porcelain rendered the previous heat treatment recommended by the manufacturer unnecessary. Airborneparticle abrasion influenced the strength of heat-treated zirconia.en
dc.description.affiliationUniversidade Estadual Paulista Júlio de Mesquita Filho, Departamento de Materiais Odontológicos e Prótese, Faculdade de Odontologia de Araraquara, Araraquara, Rua Humaitá, 1680, Centro, CEP 14801-903, SP, Brasil
dc.description.affiliationUnespUniversidade Estadual Paulista Júlio de Mesquita Filho, Departamento de Materiais Odontológicos e Prótese, Faculdade de Odontologia de Araraquara, Araraquara, Rua Humaitá, 1680, Centro, CEP 14801-903, SP, Brasil
dc.format.extent451-458
dc.identifierhttp://jad.quintessenz.de/index.php?doc=abstract&abstractID=32663/
dc.identifier.citationJournal of Adhesive Dentistry, v. 16, n. 5, p. 451-458, 2014.
dc.identifier.doi10.3290/j.jad.a32663
dc.identifier.issn1461-5185
dc.identifier.lattes3041561340615890
dc.identifier.lattes0455968557454133
dc.identifier.urihttp://hdl.handle.net/11449/125787
dc.language.isoeng
dc.relation.ispartofJournal of Adhesive Dentistry
dc.relation.ispartofjcr1.691
dc.relation.ispartofsjr0,839
dc.rights.accessRightsAcesso restrito
dc.sourceCurrículo Lattes
dc.subjectZirconiaen
dc.subjectAirborne-particle abrasionen
dc.subjectGrindingen
dc.subjectHeat treatmenten
dc.subjectBiaxial flexural strengthen
dc.titleEffect of surface and heat treatments on the biaxial flexural strength and phase transformation of a y-tzp ceramicen
dc.typeArtigo
unesp.author.lattes3041561340615890
unesp.author.lattes0455968557454133
unesp.author.orcid0000-0001-6657-913X[1]
unesp.author.orcid0000-0001-8753-2074[5]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araraquarapt
unesp.departmentMateriais Odontológicos e Prótesept

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