Studyo of Micro leakage of Tunnel Cavity Preparation and Filling Method

研究了隧道空腔制备及充填方法中的边际渗漏问题。在窝洞准备方面，对超声洁净器进行了改进，将其用于去除治疗困难部位的软牙本质。测试了连接到刮刀上的勺子类型和#2圆钻，发现#2圆钻更易于使用。在充填方法中，渐进式充填法的边缘渗漏优于原始法，草离子水门汀和复合树脂的渐进式充填效果与复合树脂的渐进式充填法相同，但更稳定。当这个隧道洞在实验室为四年级学生准备时，98名学生中有两名有边缘脊状缺陷。结果表明，隧道空洞是一种安全的空洞制备方法，操作简单，值得在临床上推广应用。

Marginal leakage of Tunnnel cavity preparation and filling method were studied. In cavity preparation, Ultra sonic scaler was improved and used to remove soft dentin located at difficult places for treatment. Attached to the scaler, spoon exca types and #2 round burs were tested and #2 round bur was found to be easier to use. In filling method, marginal leakage of incremental filling methods were excellent than that of bulk methods, and the results of incremental methods of grass ionomer cement and composite resin were as good as those of incremental methods of composite resins but were more stable. When this tunnnel cavity was prepared in the laboratory class for the 4th graders, two out of 98 students had marginal ridge defect. As being demonstrated, the tunnel cavity is safe cavity preparation, with minimal intervention, so that it should bemore widely used in clinic.