Influence of Background Color on the Chromatic Value of Four All-Ceramic System Core Materials

摘要

This study aims to investigate the effect of background color on the chromatic value of four all-ceramic system core materials at clinically appropriate thicknesses.Disc specimens with 15 mm in diameter and thicknesses ranging from 0.5±0.01mm In-Ceram zirconia core,Cercon base zirconia core,and Cercon base color zirconia core) to 0.8±0.0lmm (Empress Ⅱ) were fabricated.A coiorimeter (CIE-1976-Lab) measured the chromatic value of all samples placed on a high-noble metal-ceramic alloy and a visible light-cured dental composite resin (A2 color) background,after which the color difference was calculated.The color difference of Empress Ⅱ samples was more than 1.5 among different background color groups,while that of Zirconia was less than 1.5.The influence of background color on the Empress Ⅱ dentin was visible,such that it could be used on a tooth color post.Meanwhile,the influence of background color was invisible for the three kinds of Zirconia core materials,such that the materials developed excellent color-masking abilities and could be adapted for use on any color background.