METHODS: Standard curve of endotoxin was established and the exudant from root canals 120 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。