J Adhes Dent. 2013 Dec;15(6):547-51. doi: 10.3290/j.jad.a29634.
This study examined the effect of selecting a single-peak blue vs a polywave blue/violet emission LED curing light on the degree of conversion (DC) and Knoop microhardness (KHN) of resin cements when light cured through a ceramic disk.
Two shades (A1 and A4) of resin cement (Variolink II) were placed in a 0.5-mm-thick ring. The top surfaces were covered with a Mylar strip and further covered with a disk of 1-mm-thick Empress Esthetic ceramic, shade A2. The specimens were light cured by means of an Elipar-S10 (3M ESPE, single-peak blue LED) or BluePhase-G2 (Ivoclar Vivadent, polywave blue/violet LED) curing light, both for 20 s, directly on the surface of an attenuated total reflectance FT-IR plate at 30°C. The DC of the resin was calculated after 100 s. The specimens were removed, and the Knoop microhardness was tested immediately and again after 24-h storage in the dark at 37°C and 100% humidity. Five specimens were made in each group. The DC and Knoop microhardness results were analyzed with ANOVA and Fisher's PLSD at α = 0.05.
The choice of curing light had no significant effect on the DC and only a small effect on the immediate and 24-h KHN values. Shade A4 of the resin cement was harder and had a higher DC than shade A1.
When light cured for 20 s, Variolink II resin cement can be light cured with either the single-peak or the polywave curing light. Shade A4 of the cement was slightly harder than A1.
本研究考察了在通过陶瓷盘对蓝色单峰与蓝色/紫色多峰发射 LED 光固化灯进行选择时，对树脂水门汀的聚合度（DC）和维氏硬度（KHN）的影响。
将两种色调（A1 和 A4）的树脂水门汀（Variolink II）置于 0.5mm 厚的环中。在其顶部表面覆盖聚酯薄膜条，并用 1mm 厚的 Empress Esthetic 陶瓷盘（A2 色调）进一步覆盖。通过 Elipar-S10（3M ESPE，蓝色单峰 LED）或 BluePhase-G2（义获嘉伟瓦登特，蓝色/紫色多峰 LED）光固化灯，在 30°C 下以 20s 的时间直接对衰减全反射 FT-IR 板的表面进行光照固化。在 100s 后计算树脂的 DC。将试件取出，立即进行 Knoop 显微硬度测试，然后在黑暗中于 37°C 和 100%湿度下储存 24h 后再次测试。每组制作 5 个试件。采用方差分析和 Fisher's PLSD 对 DC 和 Knoop 显微硬度结果进行分析，α=0.05。
固化灯的选择对 DC 没有显著影响，对即时和 24h KHN 值的影响也很小。树脂水门汀的 A4 色调比 A1 色调更硬，DC 更高。
当光照 20s 时，Variolink II 树脂水门汀可以用单峰或多峰固化灯进行光固化。水泥的 A4 色调比 A1 色调稍硬。
