Schneider Luis Felipe J, Cavalcante Larissa M, Consani Simonides, Ferracane Jack L
Dental School, The University of Passo Fundo, RS, Brazil.
Dent Mater. 2009 Mar;25(3):369-75. doi: 10.1016/j.dental.2008.08.003. Epub 2008 Oct 9.
To evaluate the effect of amine ratio (ethyl 4-dimethylaminobenzoate, EDMAB) on the maximum rate of polymerization (R(p)(max)), degree of conversion (DC), Knoop hardness (KH), water sorption (Wsp), water solubility (Wsl) and color changes (DeltaE) over time of resin composites formulated with the photoinitiators camphorquinone (CQ), phenylpropanedione (PPD) and CQ-PPD in combination.
Experimental resin composites were made with photoinitiator:amine ratios of 2:1, 1:1, 1:1.5 and 1:2 by weight. R(p)(max) was evaluated with differential scanning calorimetry (DSC), DC with DSC and Fourier transformed infrared (FTIR) spectroscopy, KH with Knoop indentation, Wsp and Wsl adapted from ISO 4049; and color with a chromameter. The results were analyzed with two-way ANOVA/Tukey's multiple comparison test (p<0.05).
The higher the amine ratio in the composite, the higher was DC, R(p)(max), and KH, and the lower was Wsl, regardless of the photoinitiator type. The use of PPD alone resulted in poorer properties than CQ and CQ-PPD. Many factors seem to affect the color changes and the b-axis data revealed that the higher the amine ratio, the higher was the +b value (yellowing) for CQ and CQ-PPD formulations.
Higher amine ratios led to improved polymer properties, but also produced more yellowing in resin composites with CQ and CQ-PPD. The use of PPD alone was not advantageous for producing good final properties when compared to CQ and CQ-PPD.
评估胺比例（4-二甲基氨基苯甲酸乙酯，EDMAB）对分别用光引发剂樟脑醌（CQ）、苯丙二酮（PPD）以及CQ - PPD组合配制的树脂复合材料随时间变化的最大聚合速率（R(p)(max)）、转化率（DC）、努氏硬度（KH）、吸水率（Wsp）、水溶性（Wsl）和颜色变化（ΔE）的影响。
通过重量比为2:1、1:1、1:1.5和1:2的光引发剂与胺比例制备实验性树脂复合材料。采用差示扫描量热法（DSC）评估R(p)(max)，用DSC和傅里叶变换红外（FTIR）光谱法评估DC，用努氏压痕法评估KH，根据ISO 4049评估Wsp和Wsl；并用色差仪测量颜色。结果采用双向方差分析/ Tukey多重比较检验进行分析（p<0.05）。
无论光引发剂类型如何，复合材料中胺比例越高，DC、R(p)(max)和KH越高，Wsl越低。单独使用PPD时性能比CQ和CQ - PPD差。许多因素似乎影响颜色变化，b轴数据显示，对于CQ和CQ - PPD配方，胺比例越高，+b值（变黄）越高。
较高的胺比例可改善聚合物性能，但也会使含CQ和CQ - PPD的树脂复合材料产生更多变黄现象。与CQ和CQ - PPD相比，单独使用PPD对获得良好的最终性能并无优势。
