Comparative analysis between two lithium disilicate materials with different thickness on the final color reproduction after thermocycling

Abstract

Two ceramic materials indicated for thin laminate veneers were used in this study e-max from ivoclar and lisi from gc The purpose of the present study was to evaluate the color production of two lithium disilicate materials: lithium disilicate (A2) and initial lithium disilicate (A2), Constructed in three different thicknesses: 0.5mm , 0.7 mm,1 mm after thermocycling. Each group will be cemented to a composite substrate shade (A2) by resin cement (translucent). Then color measuring to all specimens was done. All specimens were subjected to thermocycling 5000 cycle resembling 6 months in patient mouth. Then quantitative measurement of color production was obtained by measuring CEILAB coordinates of specimen before and after thermocycling. Color result: numerical data were explored by Kolmogorov-Smirnov and Shaprio-Wilk tests calculating mean and standard deviation . Two-way ANOVA and Turkeys test used to study the effect of different tested variables . the significance level p<0.05 .