Bottino Marco Cícero, Valandro Luiz Felipe, Kantorski Karla Zanini, Bressiani José Carlos, Bottino Marco Antonio
Department of Materials Science and Engineering, University of Alabama at Birmingham, 1530 3rd Avenue South, Birmingham, AL 35294, USA.
Braz Dent J. 2006;17(4):285-9. doi: 10.1590/s0103-64402006000400004.
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 - microm) 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.
陶瓷表面的机械抛光方法能产生与釉面相似的表面粗糙度。按照制造商的规格制备了25个维他多阿尔法陶瓷圆盘（5毫米×2毫米）。所有试样均进行了釉面处理，并根据精加工和抛光方案随机分为5组（n = 5）：G1：釉面（对照组）；G2：金刚石车针精加工；G3：G2 + 硅橡胶头抛光；G4：G3 + 毛毡盘/金刚石抛光膏；G5：G3 + 浸渍细颗粒金刚石膏的毛毡盘。接下来，计算表面粗糙度平均值（Ra - 微米）。通过扫描电子显微镜进行定性分析。将表面粗糙度数据进行方差分析和Tukey检验，显著性水平为5%。G1和G4在统计学上相似（p>0.05）。G2的粗糙度平均值最高（p<0.05），其次是G3、G5、G4和G1组，呈递减顺序。该假设得到部分证实，因为尽管精加工和抛光是技术上关键的步骤，但只有机械抛光（G4）产生了与表面釉面相似的表面粗糙度。
