Methods: 156 teeth of dead pulp were chosen and treated randomly by using either paste of dexamethason and calcium hydroxide or formocresol(FC) as intracanal medication.

• 方法:选择死髓牙根管治疗156个患牙,根管治疗过程中分别采用地塞米松氢氧化钙糊剂与传统的根管消毒药物甲醛甲酚(FC)根管内封药,对治疗结果进行比较。