Effect of grinding and heat treatment on the mechanical behavior of zirconia ceramic

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dc.contributor.authorRamos, Gabriela Freitas [UNESP]
dc.contributor.authorPereira, Gabriel Kalil Rocha
dc.contributor.authorAmaral, Marina [UNESP]
dc.contributor.authorValandro, Luiz Felipe
dc.contributor.authorBottino, Marco Antonio [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de Sergipe (UFS)
dc.date.accessioned2018-12-11T17:27:07Z
dc.date.available2018-12-11T17:27:07Z
dc.date.issued2016-01-01
dc.description.abstractThe present study investigated the effect of grinding on roughness, flexural strength, and reliability of a zirconia ceramic before and after heat treatment. Seven groups were tested (n = 15): a control group (labeled CG, untreated), and six groups of samples ground with diamond discs, simulating diamond burs, with grits of 200 μm (G80); 160 μm (G120), and 25 μm (G600), either untreated or heat-treated at 1200°C for 2 h (labeled A). Yttria tetragonal zirconia polycrystal discs were manufactured, ground, and submitted to roughness and crystalline phase analyses before the biaxial flexural strength test. There was no correlation between roughness (Ra a nd R z) and flexural strength. The reliability of the materials was not affected by grinding or heat treatment, but the characteristic strength was higher after abrasion with diamond discs, irrespective of grit size. The X-ray diffraction data showed that grinding leads to a higher monoclinic (m) phase content, whereas heat treatment produces reverse transformation, leading to a fraction of m-phase in ground samples similar to that observed in the control group. However, after heat treatment, only the G80A samples presented strength similar to that of the control group, while the other groups showed higher strength values. When zirconia pieces must be adjusted for clinical use, a smoother surface can be obtained by employing finer-grit diamond burs. Moreover, when the amount of monoclinic phase is related to the degradation of zirconia, the laboratory heat treatment of ground pieces is indicated for the reverse transformation of zirconia crystals.en
dc.description.affiliationUniversidade Estadual Paulista-UNESP Science and Technology Institute School of Dentistry
dc.description.affiliationUniversidade Federal de Santa Maria-UFSM School of Dentistry
dc.description.affiliationUnespUniversidade Estadual Paulista-UNESP Science and Technology Institute School of Dentistry
dc.identifierhttp://dx.doi.org/10.1590/1807-3107BOR-2016.vol30.0012
dc.identifier.citationBrazilian Oral Research, v. 30, n. 1, 2016.
dc.identifier.doi10.1590/1807-3107BOR-2016.vol30.0012
dc.identifier.fileS1806-83242016000100012.pdf
dc.identifier.issn1807-3107
dc.identifier.issn1806-8324
dc.identifier.lattes9234456003563666
dc.identifier.scieloS1806-83242016000100012
dc.identifier.scopus2-s2.0-84957700769
dc.identifier.urihttp://hdl.handle.net/11449/177787
dc.language.isoeng
dc.relation.ispartofBrazilian Oral Research
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectCeramics
dc.subjectDental alloys
dc.subjectDental materials
dc.titleEffect of grinding and heat treatment on the mechanical behavior of zirconia ceramicen
dc.typeArtigo
unesp.advisor.lattes9234456003563666

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