Evaluation of Shade Reproduction Tolerance to Variation in Layers Thicknesses

Abstract

This study was conducted to compare the effect of variation of the outer enamel composite layer thickness on the final shade for the bilaminar technique versus the experimental trilaminar technique and to evaluate the effect of variation of the core layers thicknesses on the final shade for the experimental trilaminar technique using three methods of evaluation which are spectrophotometry by VITA Easyshade® V (Vita Zahnfabrik, Bad Säckingen, Germany), cross-polarized photography by eLAB_prime software (Emulation, Freiburg, Germany) and subjectively by evaluation of shade differences in color calibrated cross polarized photographs.