本文选用离体牙制备Ⅴ类洞,并用三种国产复合树脂和一种进口复合树脂充填窝洞,以观察充填物与牙体组织的密封性。将充填好的牙齿进行温差老化循环,硝酸银染色并进行染料微渗漏计分。结果表明,国产材料中EM复合树脂的计分最低且封闭性能最好,与美国登麦公司的产品性能相近。 In this paper, Ⅴ-type cavities were prepared from isolated teeth, and three kinds of domestically produced composite resin and one kind of imported composite resin were used to fill the cavities to observe the tightness between the filling and the tooth tissue. The filled teeth were subjected to temperature aging cycles, silver nitrate staining and dye microleakage scoring. The results show that the lowest score and the best sealing performance of EM composites in domestic materials are similar to those of the American company.