The effect of polishing techniques on the surface roughness of a feldspathic porcelain

Mario Cezar Oliveira, Alex Correia Vieira, Carolina Baptista Miranda, Márcia Sepúlveda Noya


Purpose: This in vitro study compared the effect of four different polishing methods on the surface roughness of a feldspathic dental porcelain.
Methods: Forty disc-shaped specimens were fabricated with a feldspathic porcelain (Super Porcelain EX3), glazed, and randomly divided into 4 experimental groups and 1 control group (n=8/group). For the experimental groups, the glazed layer was ground with a diamond rotary instrument, and the surface was polished with: rubber points (Edenta), steel finishing burs (Meisinger), silicon rubber point (Shofu) + diamond felt wheel (FGM) + diamond paste (Diamond Excel, FGM), or aluminum oxide discs (Sof-Lex, 3M-ESPE) + diamond felt wheel + diamond paste. Surface roughness (Ra) was measured profilometrically. Data were analyzed by analysis of variance and Tukey test (α=5%).
Results: The Ra values were not statistically different among the four polishing groups (P>0.05). All polishing groups had significantly higher mean Ra values than the control glazed specimens (P<0.001).
Conclusion: Within the limitations of this study, the results indicate that the tested polishing techniques were not able to provide a porcelain surface as smooth as the glazed surface.
Key words: Ceramic; roughness; polishing techniques


Ceramic; roughness; polishing techniques

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e-ISSN: 1980-6523

ISSN-L: 0102-9460


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