METHODS: Standard curve of endotoxin was established and the exudant from root canals of 20 cases with acute periapical diseases was used to detect the contents of bacterial endotoxin by AOL method.

• 方法:取20个急性尖周病患牙根管渗出液,建立内毒素标准曲线,鲎试剂检测内毒素含量。