Polishing methods of an alumina-reinforced feldspar ceramic

• Autor(a) principal: Bottino, Marco Cícero
• Data de Publicação: 2006
• Outros Autores: Valandro, Luiz Felipe, Kantorski, Karla Zanini [UNESP], Bressiani, José Carlos, Bottino, Marco Antonio [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/S0103-64402006000400004; http://hdl.handle.net/11449/69296
• topic: Alumina-reinforced feldspar ceramic; Finishing and polishing; Surface roughness; aluminum oxide; aluminum silicate; diamond; feldspar; potassium derivative; silastic; unclassified drug; vitadur alpha; ceramics; chemistry; clinical trial; controlled clinical trial; controlled study; human; instrumentation; materials testing; methodology; randomized controlled trial; scanning electron microscopy; surface property; tooth brushing; tooth prosthesis; Aluminum Oxide; Aluminum Silicates; Ceramics; Dental Polishing; Dental Porcelain; Diamond; Humans; Materials Testing; Microscopy, Electron, Scanning; Potassium Compounds; Silicone Elastomers; Surface Properties

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.