Favarão J, Oliveira Dcrs, Zanini M M, Rocha M G, Correr-Sobrinho L, Sinhoreti Mac
Dental School, Centro Universitário Dinâmica das Cataratas, Paraná Avenue, 5661, Vila A, Foz do Iguaçu, 85868-030, Brazil.
Department of Restorative Dental Sciences, Operative Dentistry Division, College of Dentistry, University of Florida, 1395 Center Drive, Gainesville, FL, 32610, USA.
J Mech Behav Biomed Mater. 2021 Jan;113:104110. doi: 10.1016/j.jmbbm.2020.104110. Epub 2020 Sep 22.
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.
本研究旨在评估陶瓷贴面的光衰减对含有不同光引发剂的树脂水门汀的转化率（DC）、弯曲强度（FS）和颜色变化（CC）的影响。因此，样本包括含有不同光引发剂的树脂水门汀：（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/甲基丙烯酸2-（二甲基氨基）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；以及（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）的厚度分别为0.4毫米、0.7毫米、1.0毫米或1.5毫米。使用光谱仪测量多峰发光二极管透过陶瓷贴面的光辐照度（n = 5）。在有和没有贴面的水门汀中测试DC（显微拉曼光谱仪）和FS（条形样本）。在紫外线人工老化前后评估颜色变化。数据进行方差分析和Tukey检验（α = 0.05）。考虑所有厚度，紫光光谱显示透过贴面的辐照度值最低。对于所有贴面，BAPO的DC值最高。CQ/EDMAB + TPO、CQ + EDMAB和CQ + DMPOH在所有厚度下的DC值相似。TPO（1.0毫米）的DC和FS值最低。CQ + TPO和CQ/胺类的FS值相似。CQ + EDMAB和CQ + DMAEMA的颜色变化值最高，而TPO的颜色变化值最低。得出的结论是，BAPO改善了树脂水门汀的物理和化学性能。考虑所有贴面组和对照组，CQ/EDMAB + TPO表现出最大的颜色稳定性，且不影响所评估的其他性能。
