A Study on the Multipurpose Prime of Resin Modified Glass Ionomer Cement

本研究的目的是研究光固化II型玻璃离子水泥（RMGIC）的实验性多用途底漆（GC Inc）对牛牙釉质和牙本质的粘附性能。取2 ~ 3岁牛下颚门牙，拔牙后冷冻（-20℃）保存2周，作为人牙的替代物。然后将每个牙齿安装在冷固化丙烯酸树脂（Tray resin II, Shofu Inc）中以暴露模具扁平区域，并放入自来水中以减少丙烯酸的放热聚合引起的温度升高。最后，在600粒的湿SiC纸上进行研磨，直到露出足够面积的牙本质。本研究使用的材料为Fuji Ionomaer Type II LC （GC Inc.）和2种实验引物。其中一种引物是由5wt%的二甲基丙烯氧基磷酸乙酯、35wt%的甲基丙烯酸2-羟乙酯（HEMA）、0.5%的脑醌（CQ）和0.1 wt%的还原剂与10wt%的丙酮溶液组成的磷酸体系（PA）。另一引物为羧酸体系（ME），由5wt%的4-甲基丙烯氧乙基三酸酐、35wt%的HEMA、0.5wt%的CQ、0.1wt%的还原剂和20wt%的乙醇溶剂组成。用一种空腔调节剂（GC Inc.）作为对照。粘接后的试样在5℃-60℃（每浴1分钟）进行3000次、10000次、30000次的高温保温。通过测量粘结强度后的剪切粘结强度和粘结界面上的断裂模式以及扫描电镜（JSM-5400， JOEL）对粘结界面进行评价。实验用多用途引物提高了牙本质与牙釉质的结合强度。粘结强度随TC数量的增加而降低。特别是，不同功能单体的结合强度下降趋势不同。当使用羧酸盐体系的ME时，它倾向于延缓牙本质结合强度下降的时间。在Fuji Ionomaer II型LC与齿基之间的结合界面上发现了一层非结构耐酸层，但该层对结合耐久性的贡献作用尚不清楚。少

The purpose of this study examined the adhesive property for the bovine enamel and dentin of experimental multipurpose primer (GC Inc) developed for light-cured type II glass-ionomer cement (RMGIC).The mandibular incisors from 2-3 year old cattle stored frozen (-20 ℃) up to 2 weeks after extraction were used as a substitute for human teeth. Each tooth was then mounted in cold-curing acrylic resin (Tray Resin II, Shofu Inc) to expose die flattened area and placed into tap water to reduce the temperature rise from the exothermic polymerization of the acrylic. Final finish was accomplished by grinding on wet 600-grit SiC paper until a sufficient area of dentine was exposed.A material used in this study are Fuji Ionomaer Type II LC (GC Inc.) and 2 kinds of experimental primers. One of the primer was the phosphate system (PA) composed of 5wt% bis-methacryloxy ethyl phosphate, 35wt% 2-hydroxyethyl methacrylate (HEMA) 0.5% Camphorquinone (CQ) and 0.1 wt% reducing agent with 10wt% acetone solv … More ent. The other primer was carboxylate system (ME) composed of 5wt% 4-methacryloxyethyl trimellitate anhydride, 35wt% HEMA, 0.5wt% CQ and 0.1wt% reducing agent with 20wt% ethanol solvent. A Cavity Conditioner (GC Inc.) was used as a control. Bonded specimens were subjected to TC between 5℃-60℃ (the storage time in each bath was 1 minute) for 3,000, 10,000 and 30,000 times. The evaluation was carried out by measuring shear bond strength and fracture pattern after bond strength measurement and scanning electron microscopy (JSM-5400, JOEL) on bonded interface.The experimental multipurpose primers improved the enamel and dentin bond strength. The bond strength decreased with the increase in number of TC. Especially, the decreasing tendency of bond strength was different with the type of functional monomers in the experimental primers. It tended to retard the time in which the dentin bond strength decreased, when ME of the carboxylate system was used. A non-structure acid-resistant layer was observed in the bonded interface between Fuji Ionomaer Type II LC and tooth substrate, but the function of this layer for the contribution to bonding durability was unknoun. Less