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dc.contributor.authorFonseca, Renata Garcia-
dc.contributor.authorAbi-Rached, Filipe de Oliveira-
dc.contributor.authorReis, José Maurício dos Santos Nunes-
dc.contributor.authorRambaldi, Elisa-
dc.contributor.authorBaldissara, Paolo-
dc.identifier.citationThe Journal of Prosthetic Dentistry, v. 110, n. 6, p. 510-514, 2013.-
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.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.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionCentro Ceramico Bologna-
dc.contributor.institutionUniversity of Bologna-
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.rights.accessRightsAcesso restrito-
dc.relation.ispartofThe Journal of Prosthetic Dentistry-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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