Conservative Dentistry Department, School of Dentistry, Federal University of Rio Grande do Sul, RS, Brazil.
J Adhes Dent. 2011 Apr;13(2):125-9. doi: 10.3290/j.jad.a18781.
To evaluate the effect of variations in 2-hydroxyethyl methacrylate (HEMA) concentrations in an experimental comonomer blend on degree of conversion, water sorption, solubility, and ultimate tensile strength of adhesive resin.
The effect of HEMA content (0, 15, 30, and 50%wt - control, G15, G30, and G50 groups, respectively) was tested in an experimental comonomer blend of bis-GMA, bis-EMA, TEG-DMA, and HEMA. The degree of conversion, polymerization rate, ultimate tensile strength, water sorption, and solubility of the adhesive resin blends were determined.
At 40 s of light activation time, groups G30 and G50 showed a decrease of 30% and 61%, respectively, in degree of conversion compared to control. Water sorption and solubility differed for all groups, and was statistically higher in G50. For ultimate tensile strength, the control and G15 groups showed statistically higher values than the other groups (p < 0.05).
Higher HEMA content increases dental adhesive resin degradation.
评估实验性共聚单体混合物中 2-羟乙基甲基丙烯酸酯 (HEMA) 浓度的变化对黏附树脂的转化率、吸水率、溶解度和拉伸强度的影响。
在双酚 G 甲基丙烯酸酯 (bis-GMA)、双甲基丙烯酸乙酯 (bis-EMA)、三乙二醇二甲基丙烯酸酯 (TEG-DMA) 和 HEMA 的实验性共聚单体混合物中测试了 HEMA 含量（0、15、30 和 50wt-%，分别为对照、G15、G30 和 G50 组）的影响。测定了黏附树脂混合物的转化率、聚合速率、拉伸强度、吸水率和溶解度。
在 40s 的光激活时间下，G30 和 G50 组的转化率分别比对照降低了 30%和 61%。所有组的吸水率和溶解度均有所不同，G50 组的吸水率和溶解度均显著较高。对于拉伸强度，对照和 G15 组的数值明显高于其他组（p<0.05）。
HEMA 含量的增加会导致牙科黏附树脂降解。
