To study the content alteration of bacterial endotoxin in the exudant from the root canals of periapical treated with calcium hydroxide as intracanal medicament.

检测氢氧化钙封尖周患牙细菌毒素的变化。

To study the content alteration of bacterial endotoxin in the exudant from the root canals of periapical diseases treated with calcium hydroxide as intracanal medicament.

检测氢氧化钙封尖周患牙细菌毒素的变化。