Methods: This experimental study was conducted under in vitro condition. 20 disc-shaped specimens, 10 mm in diameter and 2 mm thick were prepared. All of the specimens had opaque layer and A2 shade was used for them. In order to have similar specimens, the same plaster mold and technician were used. The samples were randomly divided into two groups, each containing 10 specimens. One group received glazing powder and the other was prepared by polish kit. Specimens from each group were immersed in 0.2% chlorhexidine mouthwash solution for 30 days. Differences in color before and after 30 days were calculated using spectrophotometric analysis. Overall color difference was determined using the CIE Lab system for measuring small color differences.
Results: After 30 days of immersion in solution, ΔE value was 0.78±0.19 in polish group and 0.76±0.16 in glaze group (P<0.05). The result of this study showed a little difference in color stability between the polished and glazed specimens. This was not statistically significant.
Conclusions: It can be concluded that all of the color stability in both groups were acceptable clinically, and there was not a significant difference between the two groups.