Polishing methods of an alumina-reinforced feldspar ceramic
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Brazilian Dental Journal
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The purpose of this study was to test the hypothesis that mechanical polishing methods of ceramic surfaces allow similar superficial roughness to that of glazed surfaces. Twenty-five Vitadur Alpha ceramic discs (5 mm x 2 mm) were prepared according to the manufacturer's specifications. All specimens were glazed and randomly assigned to 5 groups (n=5), according to finishing and polishing protocols: G1: glazed (control); G2: diamond bur finishing; G3: G2 + silicon rubber tip polishing; G4: G3 + felt disc/diamond polishing paste; G5: G3 + felt disc impregnated with fine-particle diamond paste. Next, surface roughness means (Ra - μm) were calculated. Qualitative analysis was made by scanning electron microscopy. Surface roughness data were submitted to ANOVA and Tukey's test at 5% significance level. G1 and G4 were statistically similar (p>0.05). G2 presented the highest roughness means (p<0.05) followed by groups G3, G5, G4 and G1 in a decreasing order. The hypothesis was partially confirmed as only the mechanical polishing (G4) produced similar superficial roughness to that of surface glazing, although finishing and polishing are technically critical procedures.
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BOTTINO, MARCO C.; VALANDRO, LUIZ F.; KANTORSKI, KARLA Z.; BRESSIANI, JOSE C.; BOTTINO, MARCO A. Polishing methods of an alumina-reinforced feldspar ceramic. Brazilian Dental Journal, v. 17, n. 4, p. p. 285-289, 2006. DOI: 10.1590/s0103-64402006000400004. Disponível em: http://repositorio.ipen.br/handle/123456789/5401. Acesso em: 20 Mar 2026.
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