Development of new primer for light-cured glass Ionomer cement-effect of priming on dentin bond strength-

光固化玻璃离子水门汀克服了粘接性能的缺点。与树脂复合材料相比，光固化玻璃离子水门汀的缺点是牙本质对牙本质结构的粘接强度较低，本课题旨在研制一种能提高光固化玻璃离子水门汀粘接强度的新型牙本质底漆Fuji II LC（GC），并研究其对牙本质结构的影响。本研究的第一步是评估市售光固化复合树脂底漆的粘接能力。第二步，完成对牙本质底漆的补充和改进，使其适用于轻质凝块玻璃离子水门汀。经确定，与市场上市售的底漆相比，使用磷酸酯底漆后，牙本质底漆可实现更高程度的牙本质粘结强度。使用以下组分可获得更高的粘结强度：5.0%磷酸酯（PM 2）单体、35.0%甲基丙烯酸甲酯、20.0%乙醇、40.0%水、0.5%樟脑醌和1.0%环氧乙烷的交联度为100%。在这些研究中需要进一步的步骤来定义这些杂化树脂/环氧树脂玻璃离子材料与牙本质的粘接性能，评价该牙本质底漆的临床应用效果，并研制出另一种含碳功能单体的牙本质底漆。

Light-cured glass ionomer cements posses the disadvantage of adhesion property. Compared with resin composite, this weakness of light-cured glass ionomer cements are low dentin bond strength to dentine structure.The aim of this research project was to develop a new dentin primer that improves the dentin bond strength of bonded light-cured glass ionomer cement, Fuji II LC (GC) and investigate the influence of new dentin primer on dentin structure. The First step in this study was accomplished to estimated the bonding ability of commercially available primer of light-cured composite resins. Secondary step, accomplished to make up and improve the dentin primer to be suitable for light-curd glass ionomer cement.It was determined that a significantly greater degree of dentin bond strength was achievable dentin primer following phosphate ester primer compared to commercially available primer on the market. And higher bond strengths were obtained with the following component : 5.0% Phosphate ester (PM2) monomer, 35.0% HEMA,20.0% Ethanol, 40.0% Water, 0.5% Camphorquinone and 1.0% EPA.Chronologically bond strength was 8.6 MPa for immediately, 13.4 MPa after 24 hours and 13.5 MPa after 1 weeks.Further step in these studies is needed to define the mechanisms by which these hybrid resin/glass ionomer materials bonds to dentin and evaluate the clinical application of this dentin primer and develop the another type of dentin primer containing carbonic functional monomer.