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Effect of surface treatments with acid solutions on the surface roughness of an Yttrium-Tetragonal Zirconia Polycrystal

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Effect of surface treatments with acid solutions on the surface roughness of an Yttrium-Tetragonal Zirconia Polycrystal

dc.contributor.author	Goyatá, Frederico	es
dc.contributor.author	Galvão, Yvna	es
dc.contributor.author	Simões, Thamyryz-Rafaela	es
dc.contributor.author	Goyatá, Luiz-Felipe	es
dc.contributor.author	Arruda, José A.	es
dc.contributor.author	Moreno, Amália	es
dc.date.accessioned	2018-05-23T09:27:02Z
dc.date.available	2018-05-23T09:27:02Z
dc.date.issued	2018	es
dc.identifier.uri	http://hdl.handle.net/10550/66370
dc.description.abstract	The purpose of this in vitro study was to evaluate the effect of conventional surface treatment with acid solutions on the surface roughness of a zirconia-based ceramic. Specimens of yttrium-tetragonal zirconia polycrystal (Y-TZP) -based ceramic were fabricated (5.0 x 5.0 x 2.0 mm, n=40). The specimens were submitted to the tested surface treatment method and divided into 4 groups (n=10): no treatment-control (GI), airborne 110 µm aluminum oxide particle abrasion for 1 minute-conventional method (GII); etching with 48% hydrofluoric acid for 2 minutes (GIII), and nitric acid/hydrofluoric acid etching for 2 minutes (GIV). The surface roughness (Ra) test was performed, followed by AFM analysis. The results were analyzed by ANOVA and the Tukey test, with the level of significance set at a=.05. The surface treatment with acid solutions (0.16 ± 0.02-GIII; 0.11 ± 0.01-GIV) promoted a significant increase in roughness, with higher mean Ra values of Y-TZP (?m) compared to control (0.06 ± 0.01-GI) (p >.05), and lower values compared to the conventional method (0.21 ± 0.06-GII). The aluminum oxide particle treatment resulted in deep microretentions forming sharp Y-TZP peaks compared to only microretentions with acid solution treatments. All Y-TZP treatments effectively promoted microretention in the ceramic. Hydrofluoric acid (48%) proved to be more effective in increasing the Ra of Y-TZP than the nitric acid/hydrofluoric acid treatment. Atomic force microscopy images revealed that both acid solutions modified the surface of the Y-TZP in a uniform manner.	es
dc.source	Goyatá, Frederico ; Galvão, Yvna ; Simões, Thamyryz-Rafaela ; Goyatá, Luiz-Felipe ; Arruda, José A. ; Moreno, Amália. Effect of surface treatments with acid solutions on the surface roughness of an Yttrium-Tetragonal Zirconia Polycrystal. En: Journal of Clinical and Experimental Dentistry, 10 4 2018: 367-370	es
dc.title	Effect of surface treatments with acid solutions on the surface roughness of an Yttrium-Tetragonal Zirconia Polycrystal	es
dc.type	info:eu-repo/semantics/article	en
dc.type	info:eu-repo/semantics/publishedVersion	en
dc.subject.unesco	UNESCO::CIENCIAS MÉDICAS	es
dc.identifier.doi	10.4317/jced.54571	es