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作者在离体牙上比较银汞合金和玻璃离子粘固粉(以下简称玻离)逆充填时的微漏现象。材料和方法单根管离体前牙,截冠,经常规根管制备、脱水后,行氯仿牙胶侧压充填。通过摄片,选出64只根充密合牙,斜切去根尖2～3mm,备洞。随机分三组,第一组(21只牙)作银汞逆充填,第二组(23只牙)作玻离充填,第三组(20只牙),仅用热牙胶封闭。为研究逆充填远期的渗漏,再随机分A组(10只银汞,10只玻离,10只牙胶)与B组(11只银
The author compares the microleakage of silver amalgam and glass ionomer cement (hereinafter referred to as “glass ionomer”) on the backfill in vitro. Materials and methods Single root canal isolated anterior teeth, truncated crowns, conventional root canal preparation, dehydration, the line of dental implants with chloroform pressure filling. Through the film, selected root and root close to 64 teeth, bevel to the apical 2 ~ 3mm, prepare hole. Randomly divided into three groups, the first group (21 teeth) for silver-mercury backfill, the second group (23 teeth) as a glass filling, the third group (20 teeth), only with hot tooth glue closed. In order to study retrograde leakage in the long run, patients in group A (10 amalgam, 10 glassy, 10 dentin) and group B (11 silver