新型正畸粘接剂聚合特征和剪切粘接强度的研究

Setting characteristics and shear bond strength of a new acrylic-based cement as a potential orthodontic bonding agent

目的本研究测量一种新型丙烯酸类正畸粘接剂的聚合特征和剪切粘接强度,以评估其作为正畸粘接剂的可能性。方法将甲基丙烯酸甲酯、甲基丙烯酸羟乙酯、氟化钠和聚甲基丙烯酸甲酯按不同比例混合,构成3个实验组。分别测量样本的聚合特征、剪切粘接强度和粘接剂残留指数。聚合特征实验中的对照组为聚甲基丙烯酸甲酯,粘接强度实验中的对照组为光固化复合树脂(Transbond XT)。采用单因素或双因素方差分析和Kruskal-Wallis与Mann Whitney检验对数据进行统计分析。结果在同一温度下,实验组和对照组间的放热量无显著差异,实验组在23℃和37℃时的聚合时间均小于对照组。30min时实验组的粘接强度大于光固化复合树脂,1个月后光固化复合树脂的粘接强度大于实验组。1个月后实验组的粘接剂残留指数明显小于光固化复合树脂。结论这种新型粘接剂具有作为正畸粘接材料的潜力。

Objective To develop a fluoride releasing,acrylic based ＂easy on,easy off＂ bracket cement as a potential orthodontic bonding agent.Methods Three experimental cements were prepared in powder/liquid form by mixing different ratios of MMA （methylmethacrylate）and HEMA （2-Hydroxyethyl methacrylate） to form the liquid and NaF （sodium fluoride） and PMMA （polymethylmethacrylate） to form the powder.The resultant materials were tested for setting characteristics,shear bond strength and adhesive remnant index.The data were analyzed using ANOVA and Kruskal-Wallis and Mann Whitney test.Results There were no significant differences in heat of polymerization among all groups at 23℃ and 37℃.The time of polymerization of experimental groups was significantly shorter than that of PMMA.The shear bond strengths of experimental groups at 30 minutes were greater than composite resin.At one month there were significantly less adhesive remnants observed on the surface of enamel after debonding in experimental groups compared with the composite.Conclusion The new cement could potentially be useful as an orthodontic bonding agent.