Development of experimental dentin primer of Lightcured Glass Ionomer Cement

据说光固化玻璃离子水门汀在牙本质粘结强度方面不如树脂复合材料。本研究的目的是开发一种牙本质底漆，以提高光固化玻璃离子水门汀的牙本质结合强度。使用了几种实验引物。实验引物中使用的功能单体为磷酸酯单体双甲基丙烯氧乙基磷酸（双- mep）和10-甲基丙烯氧乙基磷酸（MDP），以及碳酸单体6-甲基丙烯氧乙基萘-1,2,6-三羧酸酸酐（MENTA）和4-甲基丙烯氧乙基三羧酸酸酐（4+META）。在这些单体中加入乙醇（EtOH）和2-甲基丙烯酸羟乙酯（HEMA），比例为0 ~ 50%，从实验引物中分离出来。本研究通过牙本质结合强度、扫描电镜观察和热应力测试来评价实验性牙本质引物对提高牙本质结合强度的效果。实验结果如下：1。使用含磷酸酯单体（Bis-MEP）的引物时，键合强度最高。实验引物的最佳组成为5 wt% Bis-MEP， 20 wt% EtOH, 35 wt% HEMA.2。结果表明，光固化玻璃离子水门汀与牙本质的结合界面在光固化玻璃离子水门汀与牙本质之间形成基质-牙本质互扩散层。当热应力增加时，牙本质的结合强度降低，使用含有Bis-MEP的引物时，牙本质的结合强度最高。

Light-cured glass ionomer cement are said to be inferior compared to resin composites on dentin bond strength.The aim of this research project was to develop a dentin primer which improve the dentin bond strength of light-cured glass ionomer cement. Several experimental primers were employed. Functional monomers used in experimental primers were phosphate ester monomers, bis-metacryloxyethyl phosphate (Bis-MEP) and 10-methacryloxydecil phosphate (MDP), and carbonic acid monomers, 6-methacryloxyethyl naphtalene-1,2,6-tricaboxylate anhydride (MENTA) and 4-methacryloxyethyl trimellitate anhydride (4+META). Ethanol (EtOH) and 2-hydroxyethelmethacrylate (HEMA) were added to these monomers, rations between 0 and 50% to from the experimental primers.this study was to evaluate experimental dentin primers, which have the efficacy of improving dentin boud strength, by means of dentin bond strength, SEM observation and thermally stress test.The result were as follows :1.The highest bond strength was obtained when the primer containing phosphate ester monomers (Bis-MEP) was used. The optimum composition of the experimental primer was 5 wt% Bis-MEP, 20 wt% EtOH, and 35 wt% HEMA.2.The bonding interface between Light-cured glass ionomer cements and dentin were observed cement a matrix-dentin interdiffusion layr between the cement and dentin when the experimental primers were employed.3.The dentin bond strength decreased when the thermal stress were added and the highest bond strength was obtained when the primer containing Bis-MEP was used.