Effect of particle size on the flexural strength and phase transformation of an airborne-particle abraded yttria-stabilized tetragonal zirconia polycrystal ceramic.

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dc.contributor.authorFonseca, Renata Garcia [UNESP]
dc.contributor.authorAbi-Rached, Filipe de Oliveira [UNESP]
dc.contributor.authorReis, José Maurício dos Santos Nunes [UNESP]
dc.contributor.authorRambaldi, Elisa
dc.contributor.authorBaldissara, Paolo
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionCentro Ceramico Bologna
dc.contributor.institutionUniversity of Bologna
dc.date.accessioned2015-08-06T16:13:11Z
dc.date.available2015-08-06T16:13:11Z
dc.date.issued2013
dc.description.abstractStatement of problem Because airborne-particle abrasion is an efficient method of improving the bond at the zirconia-cement interface, understanding its effect on the strength of yttria-stabilized tetragonal zirconia polycrystal is important. Purpose The purpose of this study was to evaluate the effect of the particle size used for airborne-particle abrasion on the flexural strength and phase transformation of a commercially available yttria-stabilized tetragonal zirconia polycrystal ceramic. Material and Methods For both flexural strength (20.0 × 4.0 × 1.2 mm) (n=14) and phase transformation (14.0-mm diameter × 1.3-mm thickness) (n=4), the zirconia specimens were made from Lava, and their surfaces were treated in the following ways: as-sintered (control); with 50-μm aluminum oxide (Al2O3) particles; with 120-μm Al2O3 particles; with 250-μm Al2O3 particles; with 30-μm silica-modified Al2O3 particles (Cojet Sand); with 120-μm Al2O3 particles, followed by 110-μm silica-modified Al2O3 particles (Rocatec Plus); and with Rocatec Plus. The phase transformation (%) was assessed by x-ray diffraction analysis. The 3-point flexural strength test was conducted in artificial saliva at 37°C in a mechanical testing machine. The data were analyzed by 1-way ANOVA and the Tukey honestly significant difference post hoc test (α=.05). Results Except for the Cojet Sand group, which exhibited statistically similar flexural strength to that of the as-sintered group and for the group abraded with 250-μm Al2O3 particles, which presented the lowest strength, airborne-particle abrasion with the other particle sizes provided the highest values, with no significant difference among them. The as-sintered specimens presented no monoclinic phase. The groups abraded with smaller particles (30 μm and 50 μm) and those treated with the larger ones (110 μm and/or 120 μm particles and 250 μm) exhibited percentages of monoclinic phase that varied from 4% to 5% and from 8.7% to 10%. Conclusions Except for abrasion with Cojet Sand, depending on the particle size, zirconia exhibited an increase or a decrease in its flexural strength. Airborne-particle abrasion promoted phase transformation (tetragonal to monoclinic), and the percentage of monoclinic phase varied according to the particle size.en
dc.description.affiliationUniversity of Bologna, Department of Oral Sciences, Division of Prosthodontics
dc.description.affiliationUnespUniversidade Estadual Paulista Júlio de Mesquita Filho, Departamento de Materiais Odontológicos e Prótese, Faculdade de Odontologia de Araraquara
dc.format.extent510-514
dc.identifierhttp://www.thejpd.org/article/S0022-3913(13)00162-5/abstract
dc.identifier.citationThe Journal of Prosthetic Dentistry, v. 110, n. 6, p. 510-514, 2013.
dc.identifier.doi10.1016/j.prosdent.2013.07.007
dc.identifier.issn0022-3913
dc.identifier.lattes7107464912579992
dc.identifier.lattes3041561340615890
dc.identifier.urihttp://hdl.handle.net/11449/125812
dc.language.isoeng
dc.relation.ispartofThe Journal of Prosthetic Dentistry
dc.relation.ispartofjcr2.347
dc.relation.ispartofsjr1,087
dc.rights.accessRightsAcesso restrito
dc.sourceCurrículo Lattes
dc.titleEffect of particle size on the flexural strength and phase transformation of an airborne-particle abraded yttria-stabilized tetragonal zirconia polycrystal ceramic.en
dc.typeArtigo
unesp.author.lattes7107464912579992
unesp.author.lattes3041561340615890
unesp.author.orcid0000-0001-6657-913X[1]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araraquarapt
unesp.departmentMateriais Odontológicos e Prótesept

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