Objectives: Dental porcelain occasionally requires adjustment in circumstances that preclude reglazing. Thus, the purpose of this study was to investigate the roughness of a ceramic submitted to 5 different surface treatments. Methods: Thirty disks of Vitadur Alpha porcelain (5mm X 2mm) were made, in accordance with the manufacturer's instructions. All the specimens were glazed and randomly divided into 6 groups (n=5), according to finishing and polishing systems: Group 1 – glazed (control); Group 2 – diamond bur roughening; Group 3 – G2 + polishing with KGS silicon rubber points; Group 4 – G3 + felt wheel/diamond polishing paste; Group 5 – G3+diamond felt wheel; Group 6 – diamond bur ultrafine. Subsequently, 6 analyses and 1 mean for sample of roughness Ra (Mitutoyo SJ-201P) were calculated. The qualitative analysis was made using a scanning electron microscope (x500). The mean values of roughness (table) were submitted to the ANOVA and Tukey's test. Results: The mean values of the groups 1 and 4 were quite similar. Group 2 presented the highest mean value of roughness (Mean values [µm] - G1: 0,94a; G2: 3,01b; G3: 2,02c; G4: 1,24ad; G5: 1,77cd; G6: 1,65cd). Conclusion: The lowest mean values of surface roughness were obtained with samples on wich glazing was performed.

Back to the Dental Materials: VIII - Others-Non-metallic Program
Back to the 81st General Session of the International Association for Dental Research (June 25-28, 2003)

Top Level Search