Color change of soft silicone relining materials after storage in artificial saliva

Statement of problem. The interaction between artificial saliva and color change of silicone soft liners has not been clarified. Purpose. The purpose of this in vitro study was to investigate the effect of artificial saliva storage on the color stability of soft silicone liners. Material and methods. Four silicone-based liners (Elite Soft Relining, GC Reline Soft, Megabase, and Mucopren Soft) (n=10) were tested after 7, 30, and 90 days of storage in artificial saliva at 37 degrees C in darkness. The color of each specimen was measured with a spectrophotometer using the CIELab color scale. Statistical analysis was performed with the nonparametric ANOVA for dependent variables and nonparametric ANOVA for independent variables (alpha=.05). Results. The storage in artificial saliva significantly affected the color integrity of 3 of the 4 tested materials. For GC Reline Soft material, the time of storage had no significant effect on color. Conclusions. Significant differences were found in the color changes of silicone-based denture liners after storage in artificial saliva. With regard to color stability, GC Reline Soft may be recommended for use in dental practices as a applications.