Dental Materials and Prosthodontics Department, Sao Jose dos Campos Dental School-UNESP, Sao Jose dos Campos, SP, Brazil.
Oper Dent. 2010 Jan-Feb;35(1):120-4. doi: 10.2341/09-126-L.
This study evaluated the effect of different light energy densities on conversion degree (CD) and Knoop hardness number (KHN) of RelyX ARC (RLX) resin cement. After manipulation according to the manufacturer's instructions, RLX was inserted into a rubber mold (0.8 mm x 5 mm) and covered with a Mylar strip. The tip of the light-curing unit (LCU) was positioned in contact with the Mylar surface. Quartz-tungsten-halogen (QTH) and light-emitting diode (LED) LCUs with light densities of 10, 20 and 30 J/cm2 were used to light-cure the specimens. After light curing, the specimens were stored dry in lightproof containers at 37 degrees C. After 24 hours, the CD was analyzed by FT-Raman and, after an additional 24-hours, samples were submitted to Knoop hardness testing. The data of the CD (%) and KHN were submitted to two-way ANOVA and the Tukey's test (alpha = 0.05). QTH and LED were effective light curing units. For QTH, there were no differences among the light energy densities for CD or KHN. For LED, there was a significant reduction in CD with the light energy density set at 10 J/cm2. KHN was not influenced by the light-curing unit and by its light energy density.
本研究评估了不同光能密度对 RelyX ARC（RLX）树脂水门汀转化程度（CD）和努氏硬度值（KHN）的影响。按照制造商的说明进行操作后，将 RLX 插入橡胶模具（0.8mm×5mm）中，并覆盖聚酯薄膜条。将光固化器（LCU）的尖端与聚酯薄膜表面接触。使用光密度为 10、20 和 30 J/cm2 的石英钨卤素（QTH）和发光二极管（LED）LCU 对样本进行光固化。光固化后，将样本在 37°C 的不透光容器中干燥储存。24 小时后，通过傅里叶变换拉曼（FT-Raman）分析 CD，再经过 24 小时后，对样本进行努氏硬度测试。CD（%）和 KHN 的数据接受双因素方差分析和 Tukey 检验（alpha = 0.05）。QTH 和 LED 是有效的光固化器。对于 QTH，CD 或 KHN 的光能量密度之间没有差异。对于 LED，当光能量密度设置为 10 J/cm2 时，CD 显著降低。光固化器和光能量密度对 KHN 没有影响。
