Department of Prosthodontics, School and Hospital of Stomatology, Wuhan University, Wuhan, China.
J Prosthodont. 2019 Mar;28(3):327-331. doi: 10.1111/jopr.12585. Epub 2017 Jan 20.
To investigate the color differences of ceramic veneers and the intended shade tab, and evaluate the effects of luting composites on the resultant colors of ceramic veneers.
Pressable leucite-reinforced feldspathic ceramic discs (IPS e.max), with nominal shade A3, were fabricated with thicknesses of 1.0 mm, 0.7 mm, and 0.5 mm (n = 10/ thickness). The ceramic specimens were cemented onto a composite background (shade Dentin) using a veneer adhesive system with five colors of luting composites (RelyX). The colors of the veneer (veneer/luting/background complexes) and corresponding shade tab (A3, Vitapan) were measured using a spectrophotometer, and subsequently converted to CIE Lab* values. Color differences (△E) between each complex and the shade tab were calculated and analyzed with two-way ANOVA. Tukey's multiple comparisons were used to evaluate the effects of luting composites on the △E values.
The means of color differences between ceramic veneers and intended shade tab were 2.50 ± 0.38, 3.17 ± 0.48, and 3.84 ± 0.63 for the 1.0 mm, 0.7 mm, and 0.5 mm thicknesses, respectively. △E values were significantly affected by the veneer thickness and the luting composite color (p < 0.001). Tukey's multiple comparison results revealed no significant differences among the luting composites in the thickness of 1.0 mm and 0.7 mm.
The color matching of ceramic veneers to the intended shade tab was not achieved in the 0.7 mm and 0.5 mm veneer thicknesses, whichever colors of the luting composites were used.
研究陶瓷贴面的颜色差异和目标比色板，并评估水门汀对陶瓷贴面颜色的影响。
制作厚度为 1.0mm、0.7mm 和 0.5mm（n=10/厚度）的可压长石增强型长石陶瓷圆盘（IPS e.max），名义遮色 A3。使用贴面粘接系统将陶瓷标本粘接在复合背景（牙本质遮色）上，并用五种颜色的水门汀（RelyX）。使用分光光度计测量贴面（贴面/水门汀/背景复合物）和相应比色板（A3、Vitapan）的颜色，并将其转换为 CIE Lab*值。使用双向方差分析计算并分析每个复合物与比色板之间的颜色差异（△E）。使用 Tukey 多重比较评估水门汀对△E 值的影响。
1.0mm、0.7mm 和 0.5mm 厚度的陶瓷贴面与目标比色板之间的平均颜色差异分别为 2.50±0.38、3.17±0.48 和 3.84±0.63。△E 值受贴面厚度和水门汀颜色的显著影响（p<0.001）。Tukey 多重比较结果显示，在 1.0mm 和 0.7mm 厚度时，不同颜色的水门汀之间无显著差异。
无论使用何种颜色的水门汀，在 0.7mm 和 0.5mm 的贴面厚度下，陶瓷贴面的颜色匹配均无法达到目标比色板的要求。
