EFFECT OF FINISHING AND POLISHING ON SURFACE ROUGHNESS OF CUBIC ZIRCONIA

Document Type : Original Article

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Lecturer of fixed prosthodontics, Faculty of Dentistry, Ain Shams University. Guest researcher, Oral technology Department, Bonn, Germany

Abstract

Aim: The purpose of this invitro study was to evaluate the effect of finishing and polishing on surface roughness of BruxZir Anterior Cubic zirconia before and after hydrothermal aging.
Materials and methods: Twenty samples of BruxZir Anterior Cubic zirconia were divided into two groups, group (1): Polished BruxZir Anterior Cubic zirconia (n=10), group (2): Unpolished BruxZir Anterior Cubic zirconia (n=10). All samples were fabricated out of CAD CAM blocks and evaluated for surface roughness before and after hydrothermal aging.
Results: Before aging, there was a significant difference in the surface roughness (Ra) of the polished (M=125.28, SD=1.27) and unpolished (M=128.97, SD=2.61) surfaces. Similarly after ag­ing, there was a significant difference in the surface roughness (Ra) of the polished (M=125.89, SD=1.35) and unpolished (M=130.09, SD=2.97) surfaces.
Conclusions: Finishing and polishing of cubic zirconia considerably lowered the surface roughness before and after hydrothermal aging. 

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