This study aimed to evaluate the effect of light attenuation by ceramic veneers on the degree of conversion (DC), flexural strength (FS) and color change (CC) of resin cements containing different photoinitiators. Thus, samples included resin cements containing different photoinitiators: (a) camphorquinone (CQ)/ethyl 4-(dimethylamino)benzoate (EDMAB); (b) CQ/4-(N,N-dimethylamino) phenethyl alcohol (DMPOH); (c) CQ/2(dimethylamino) ethyl methacrylate (DMAEMA); (d) CQ/ethyl 4-(dimethylamino)benzoate (EDMAB) + diphenyl(2,4,6-trimethylbenzoyl)-phosphine oxide (TPO); (e) TPO; and (f) phenylbis(2.4.6-trimethylbenzoyl)phosphine oxide (BAPO). Ceramic veneers (10 × 10 mm) were 0.4 mm, 0.7 mm, 1.0 mm or 1.5 mm thick. The light irradiance of a multiple-peak LED through ceramic veneers was measured (n = 5) using a spectrometer. DC (micro-Raman spectrometer) and FS (Bar-shaped specimens) were tested in cements with and without the veneers. Color change was evaluated before and after UV artificial aging. Data were submitted to ANOVA and Tukey's test (α = 0.05). The violet spectrum showed the lowest irradiance values through the veneer, considering all thicknesses. BAPO had the highest DC values for all veneers. CQ/EDMAB + TPO, CQ + EDMAB, and CQ + DMPOH showed similar DC values concerning all thicknesses. TPO (1.0 mm) showed the lowest DC and FS values. CQ + TPO and CQ/amines showed similar FS values. CQ + EDMAB and CQ + DMAEMA showed the highest color change values while TPO showed the lowest. It was concluded that the physical and chemical properties of the resin cement were improved with BAPO. CQ/EDMAB + TPO showed the greatest color stability, considering all veneer groups and control, without affecting the other properties assessed.

这项研究旨在评估陶瓷贴面光衰减对包含不同光引发剂的树脂水泥的转化度（DC），抗弯强度（FS）和颜色变化（CC）的影响。因此，样品包括含有不同光引发剂的树脂胶粘剂：（a）樟脑醌（CQ）/ 4-（二甲基氨基）苯甲酸乙酯（EDMAB）；（b）CQ / 4-（N，N-二甲基氨基）苯乙醇（DMPOH）；（c）CQ / 2（二甲基氨基）甲基丙烯酸乙酯（DMAEMA）；（d）CQ / 4-（二甲基氨基）苯甲酸乙酯（EDMAB）+二苯基（2,4,6-三甲基苯甲酰基）-氧化膦（TPO）; （e）TPO；（f）苯基双（2.4.6-三甲基苯甲酰基）氧化膦（BAPO）。陶瓷贴面（10×10毫米）的厚度为0.4毫米，0.7毫米，1.0毫米或1.5毫米。使用分光计测量了多峰值LED穿过陶瓷贴面的光辐照度（n = 5）。DC（微型拉曼光谱仪）和FS（条形样品）在带有和不带有贴面的水泥中进行测试。在紫外线人工老化之前和之后评估颜色变化。数据提交给方差分析和Tukey检验（α= 0.05）。考虑到所有厚度，紫罗兰色光谱显示通过胶合板的最低辐照度值。BAPO的所有单板的DC值最高。CQ / EDMAB + TPO，CQ + EDMAB和CQ + DMPOH在所有厚度上都显示出相似的DC值。TPO（1.0毫米）显示最低的DC和FS值。CQ + TPO和CQ /胺显示出相似的FS值。CQ + EDMAB和CQ + DMAEMA显示最高的颜色变化值，而TPO显示最低的颜色变化值。结论是，用BAPO可以改善树脂水泥的物理和化学性能。CQ / EDMAB + TPO显示出最大的色彩稳定性，