1. To study the content alteration of bacterial endotoxin in the exudant from the root canals of periapical treated with calcium hydroxide as intracanal medicament.
   检测氢氧化钙封药前后尖周病患牙根管内细菌内毒素的变化。
2. 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.
   检测氢氧化钙封药前后尖周病患牙根管内细菌内毒素的变化。

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