Effect of Ceramic Thickness and Cement Type on the Color Match of High-Translucency Monolithic Zirconia Restorations

摘要

Purpose: To find proper ceramic thickness-cement combinations for color matching of high-translucency monolithic zirconia restorations. Materials and Methods: A total of 300 A2-shade high-translucency zirconia disk specimens of six different thicknesses (0.7, 0.9, 1.1, 1.4, 1.6, and 1.8 mm) were cemented to A3.5-shade composite resin backgrounds with five different cements: Temp-Bond, Zinc Phosphate, RelyX Unicem 2, PANAVIA SA Cement Plus, and GC Gold Label 1. Color measurements were conducted before and after cementation to determine the specimens' CIE L*a*b* values. Delta E(00 )values were calculated for specimens to assess color differences between before cementation and after cementation (Delta E-1), between the A2 VITA classical shade (target) and specimens before cementation (Delta E-2), and between the target and specimens after cementation (Delta E-3). The Delta E-3 values were compared with an acceptability threshold (Delta E-00 = 1.8) to evaluate color matches. Data were analyzed using two-way analysis of variance, Bonferroni, and one-sample t tests (P = 1.1 mm and Zinc Phosphate with ceramic thickness of >= 0.9 showed color matches, but RelyX, PANAVIA SA, and GC did not show color matches with any tested ceramic thickness. Conclusion: Opaque cements with sufficient ceramic thicknesses created color matches for high-translucency monolithic zirconia restorations on A3.5-shade backgrounds.