有3方面的因素即患牙本身的病理改变、牙科医生的治疗操作和宿主因素可能与死髓牙根管治疗期间急症(interappointment emergencies,IAE)的发生有关,作者等对此进行了回顾性研究。调查了2000名作过根管治疗的患者,其中半数在根管预备后曾发生过疼痛。另一半则无任何疼痛和不适发生。 There are three factors that affect the pathology of the tooth itself, the dentist's treatment and host factors may be related to the occurrence of interappointment emergencies (IAE) during the root canal therapy of deadlock, and the authors did a retrospective study . Two thousand patients undergoing root canal therapy were investigated, of whom half had pain after root canal preparation. The other half without any pain and discomfort.