the effect of different solutions on optical behavior of polished and glazed zirconia-reinforced lithium silicate ceramics

This study sought to assess the effect of glazing and polishing surface treatments on the optical behavior of zirconia-reinforced lithium silicate ceramics thermocycled in different solutions. computer-aided design/computer-aided manufacturing ceramics (vita suprinity) were cut into samples (n=104) measuring 1.5x14x10 mm according to the manufacturer’s instructions. also, the samples were then randomly divided into four groups for immersion in artificial saliva, tea, orange juice and cola. a spectrophotometer was used to assess the color change and changes in l* coordinate against a white and a black background. the translucency parameter and contrast ratio were also calculated. the ∆e and l* values were analyzed using two-way anova test. student’s t-test was applied to analyze tp and cr. the interaction effect of the type of solution and type of surface treatment on color change against a white (p=0.008) and black (p<0.001) background was statistically significant. immersion of ceramic samples in orange juice and cola caused significant changes in tp and cr in the polishing and glazing groups (p < 0.05). immersion in orange juice causes clinically perceivable color change in glazed zls ceramics. immersion in cola decreases the translucency of both polished and glazed zls ceramics.