Finger W J, Lee K S, Podszun W
Dental School, University of Aachen, Germany.
Dent Mater. 1996 Jul;12(4):256-61. doi: 10.1016/s0109-5641(96)80032-7.
This study was conducted to investigate the depths of polymerization inhibition by oxygen, the shear bond strengths to enamel and dentin, and the marginal adaptation in dentin cavities of experimental adhesives containing BisGMA/HEMA of mixtures of low-inhibition BisGMA-dicarbonate with HEMA or with HEMA-carbonate at ratios of 100/0, 80/20, 60/40, 50/50, and 40/60 by weight.
The inhibition layer thickness was determined microscopically as non-polymerized surface film thickness on three samples each. For bond strength testing, composite cylinders were bonded to enamel and dentin following H3PO4 conditioning with the adhesives dissolved in acetone; marginal adaptation was evaluated in cylindrical dentin cavities. Five specimens each were stored in water for 24 h prior to testing. Shear bond strength results were compared by ANOVA and Duncan's test (p < 0.05), the maximum gap widths by Kruskal-Wallis, ANOVA and Wilcoxon's two-sample test (p < 0.01).
Inhibition layer thickness was significantly smaller for modified than for conventional BisGMA/HEMA monomers and increased significantly with HEMA content. In the BisGMA-dicarbonate/HEMA-carbonate group, the inhibited layer was thinner than 1 micron. Apart from the 40 and 50% BisGMA-dicarbonate/HEMA-carbonate mixtures, enamel bond strengths were not significantly different. The highest bond strengths to dentin were 15 and 12 MPa at 50 BisGMA and 50 BisGMA-dicarbonates/HEMA, respectively. The average bond strength for the BisGMA-dicarbonate/HEMA-carbonate group was 5 MPa. Adhesives with 40 and 60% HEMA in the conventional and 40 to 60% HEMA in the dicarbonate/HEMA group showed significantly better marginal adaptation than all others (p < 0.05).
Carbonate-modified low-inhibition monomers have no advantage as enamel/dentin adhesives compared with conventional BisGMA/HEMA-based resins.
本研究旨在调查氧气对聚合反应的抑制深度、对牙釉质和牙本质的剪切粘结强度，以及含双酚A缩水甘油醚甲基丙烯酸羟乙酯（BisGMA/HEMA）的实验性粘结剂在牙本质窝洞中的边缘适应性，这些粘结剂是低抑制性双酚A二碳酸酯与甲基丙烯酸羟乙酯（HEMA）或与甲基丙烯酸羟乙酯碳酸酯按重量比100/0、80/20、60/40、50/50和40/60混合而成。
通过显微镜测定三个样品上未聚合表面膜的厚度，以此确定抑制层厚度。对于粘结强度测试，在用磷酸（H3PO4）处理牙釉质和牙本质后，将复合圆柱体用溶解在丙酮中的粘结剂粘结；在圆柱形牙本质窝洞中评估边缘适应性。在测试前，每个组的五个样本均在水中保存24小时。通过方差分析（ANOVA）和邓肯检验（p < 0.05）比较剪切粘结强度结果，通过克鲁斯卡尔 - 沃利斯检验、方差分析和威尔科克森双样本检验（p < 0.01）比较最大间隙宽度。
改性单体的抑制层厚度显著小于传统BisGMA/HEMA单体，并且随着HEMA含量的增加而显著增加。在双酚A二碳酸酯/甲基丙烯酸羟乙酯碳酸酯组中，抑制层厚度小于1微米。除了40%和50%的双酚A二碳酸酯/甲基丙烯酸羟乙酯碳酸酯混合物外，牙釉质粘结强度没有显著差异。双酚A二碳酸酯/甲基丙烯酸羟乙酯碳酸酯组的平均粘结强度为5兆帕。传统组中含40%和60%HEMA的粘结剂以及二碳酸酯/HEMA组中含40%至60%HEMA的粘结剂显示出比其他所有粘结剂显著更好的边缘适应性（p < 0.05）。
与传统的基于BisGMA/HEMA的树脂相比，碳酸酯改性的低抑制性单体作为牙釉质/牙本质粘结剂没有优势。
