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合剂具有附着力差的缺点。与树脂复合材料相比，光固化玻璃离子水门汀的缺点是对牙本质结构的结合强度较低。本课题旨在研制一种新型牙本质引物，提高光固化玻璃离子水门柱（Fuji II LC）的牙本质结合强度，并研究新型牙本质引物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结合能力。第二步，完成牙本质底漆的配制和改进，使之适合于光凝玻璃离子水门汀。结果表明，与市场上的市售底漆相比，磷酸酯底漆后的牙本质底漆具有更大程度的牙本质结合强度。以5.0%的磷酸酯（PM2）单体、35.0%的HEMA、20.0%的乙醇、40.0%的水、0.5%的樟醌和1.0%的EPA为黏结剂，黏结强度较高。按时间顺序，粘结强度即刻为8.6 MPa， 24小时后为13.4 MPa， 1周后为13.5 MPa。这些研究需要进一步确定这些混合树脂/玻璃离聚体材料与牙本质结合的机制，评估这种牙本质引物的临床应用，并开发另一种含碳功能单体的牙本质引物。

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.