J Adhes Dent. 2014 Jun;16(3):229-34. doi: 10.3290/j.jad.a32034.
This study evaluated the effects of light exposure times on water sorption, solubility, and polymer cross-linking density of simplified etch-and-rinse adhesives.
Four commercial adhesives (XP Bond, Adper Single Bond 2, Tetric N-Bond, and Ambar) were selected, and resin disks 5 mm in diameter and 1.0 mm thick were prepared and light cured for 20, 40, or 80 s using an LED light-curing unit at 1200 mW/cm2. Water sorption and solubility were evaluated over a 28-day period. For polymer cross-linking density, additional specimens were prepared and their Knoop hardness measured before and after immersion in 100% ethanol. The data from each test were evaluated using a two-way ANOVA and Tukey's test (α = 0.05).
The XP Bond adhesive showed higher water sorption (similar to Adper Single Bond 2) and solubility (p < 0.05) than did the other materials. Prolonged exposure times did not reduce the water sorption but did reduce the solubility of all tested materials (p < 0.05). For Ambar, the increase in the exposure time resulted in a significantly lower percent reduction in hardness.
Water sorption, solubility, and cross-linking density of the materials selected in this study seem to be mainly influenced by the adhesive composition. Prolonged light exposure times reduced the solubility of the materials.
本研究评估了简化酸蚀-冲洗型黏结剂的光照时间对水吸附、溶解度和聚合物交联密度的影响。
选择了四种市售黏结剂（XP Bond、Adper Single Bond 2、Tetric N-Bond 和 Ambar），制备直径为 5mm、厚度为 1.0mm 的树脂圆盘，并使用 1200mW/cm2 的 LED 光固化器分别进行 20、40 或 80s 的光照固化。在 28 天的时间内评估水吸附和溶解度。对于聚合物交联密度，另外制备了一些试件，并在浸入 100%乙醇前后测量其努氏硬度。使用双因素方差分析和 Tukey 检验（α=0.05）对每个测试的数据进行评估。
XP Bond 黏结剂的吸水率（类似于 Adper Single Bond 2）和溶解度（p<0.05）均高于其他材料。延长光照时间并未降低吸水率，但确实降低了所有测试材料的溶解度（p<0.05）。对于 Ambar，光照时间的增加导致硬度降低的百分比显著降低。
在本研究中选择的材料的吸水率、溶解度和交联密度似乎主要受黏结剂组成的影响。延长光照时间会降低材料的溶解度。
