Relative Translucency of Dental Lithium Disilicate Ceramic Restorations

摘要

This study investigated the relative translucency of IPS E.max core-veneer combinations of different colors at a clinically appropriate thickness. Core specimens (n=5) of IPS E.max were produced and veneered with IPS E.max veneering porcelain to a final dimension (13 mm in diameter, 1.5mm in thickness). Luminous reflectance was measured three times each specimen with a calibrated spectrophotomete. Contrast ratios were measured from the luminous reflectance(Y) of the tested specimens with a black (Yb) and a white background (Yw). Contrast ratios ranged from 0.798-0.818 for LT core-veneer combinations, 0.831-0.845 for MO core-veneer combinations, 0.929-0.941 for HO core-veneer combinations. There were no significant difference in contrast ratios of core-veneer combinations of the same series (P>0.05). Contrast ratios of LT, HO, MO core-veneer specimens were significantly different (P<0.05). Luminosity and chroma are not related to the relative translucency of core-veneer specimens. LT core-veneer combinations exhibited highest relative translucency, followed by MO and HO core-veneer combinations.