Faculty of Dentistry, Department of Prosthodontics, Karadeniz Technical University, 61080 Trabzon, Turkey.
J Dent. 2011 Dec;39 Suppl 3:e57-64. doi: 10.1016/j.jdent.2011.11.006. Epub 2011 Nov 12.
Obtaining a perfect aesthetic, especially with the translucent porcelain laminate veneers; shade of the porcelain, type of the resin cement and their long term colour stability are important factors to achieve aesthetic success. The purpose of the study was to assess the effect of different resin cement systems and UV ageing on the colour of full ceramic laminates with different shades.
392 discs were made with A1, A3, HO and HT shades of IPS e.max Press with 0.5mm thickness. Different shades of light cured Variolink Veneer, Ivoclar Vivadent (+3, MO, -3); Rely X Veneer, 3M ESPE (A1, A3, White Opaque, Translucent); and dual cured Maxcem Elite, Kerr (White, Yellow, White Opaque, Clear); and Variolink II, Ivoclar Vivadent (White Opaque, Translucent) resin cements were applied on the porcelain discs with a thickness of 0.1mm. Colour differences of the porcelain substructures after cementation and 300 h (150 kJ/m(2)) of UV ageing test, were examined with a colorimeter (Shade Eye Ex, Shofu, Japan). The results were analysed statistically with Wilcoxon signed-rank and Kruskal-Wallis test. The mean values of L*, a*, and b* were also compared using Paired Sample t-test. Spearman's Rank Correlation test was used to analyse the correlation between ceramics with resin-cemented ceramics after ageing. The data analyses were evaluated at a significance level of p < 0.05 for all individual tests without any adjustment.
UV ageing caused significant colour change on ceramics and also cemented ceramics (p < 0.05). Whilst L* and a* values decreased, b* values increased after ageing. Discoloration was between 0.8-1.2 ΔE for ceramic discs and 1.4-3.1 ΔE for cemented ceramics. There is no significant difference on the colour change of dual or light cured resin cements, which were polymerized beneath the porcelain substructure with 0.5mm thickness. Although statistically significant differences were observed for all specimens, the magnitudes of the mean colour differences were at an acceptable perception level and were considered clinically acceptable (ΔE<3.5).
Resin cements and ageing process influence the colour of porcelain laminate veneers. Cementation of laminates with either dual or light-cure resin cements does not effect the long term colour stability differently.
获得完美的美学效果，尤其是使用半透明瓷贴面；瓷的色调、树脂水门汀的类型及其长期颜色稳定性是实现美学成功的重要因素。本研究的目的是评估不同树脂水门汀系统和紫外线老化对不同色调全陶瓷贴面颜色的影响。
用 0.5mm 厚的 IPS e.max Press 的 A1、A3、HO 和 HT 色调制作 392 个圆盘。不同色调的光固化 Variolink Veneer、Ivoclar Vivadent（+3、MO、-3）；Rely X Veneer、3M ESPE（A1、A3、White Opaque、Translucent）；以及双固化 Maxcem Elite、Kerr（White、Yellow、White Opaque、Clear）和 Variolink II、Ivoclar Vivadent（White Opaque、Translucent）树脂水门汀涂在厚度为 0.1mm 的瓷片上。在粘结后和 300 小时（150kJ/m²）紫外线老化试验后，使用分光光度计（Shade Eye Ex，Shofu，日本）检查瓷质基底的颜色差异。使用 Wilcoxon 符号秩检验和 Kruskal-Wallis 检验对结果进行统计学分析。还使用配对样本 t 检验比较 L*、a和 b的平均值。使用 Spearman 秩相关检验分析老化后陶瓷与树脂粘结陶瓷之间的相关性。在没有任何调整的情况下，对所有单独的测试，数据分析都在显著性水平 p < 0.05 进行评估。
紫外线老化导致陶瓷和粘结陶瓷的颜色发生明显变化（p < 0.05）。老化后，L和 a值降低，b*值增加。陶瓷盘的变色为 0.8-1.2ΔE，粘结陶瓷的变色为 1.4-3.1ΔE。厚度为 0.5mm 的瓷质基底下，双固化或光固化树脂水门汀的聚合对颜色变化没有显著影响。尽管所有标本的统计学差异均有显著意义，但平均颜色差异的幅度处于可接受的感知水平，临床可接受（ΔE<3.5）。
树脂水门汀和老化过程会影响瓷贴面的颜色。用双固化或光固化树脂水门汀粘结贴面不会对长期颜色稳定性产生不同的影响。
