慢性根尖周炎多为混合菌感染,其中大多数为厌氧菌感染,是口腔科的常见病和多发病,其临床表现在患牙咀嚼时出现不适或疼痛感,检查时牙冠多为缺损较大,或者有充填物。目前,最有效的治疗方法是根管治疗,在治疗过程中,分为常规根管治疗和一次性根管治疗两种方法。常规根管治疗患者需要多次复诊且疗程长,一些患者因某些原因无法完成治疗。一次性根管治疗术是一次完成根管的预备,冲洗,消毒,充填,缩 Chronic apical periodontitis mostly mixed bacteria infection, most of them anaerobic infections, is a common disease and frequently-occurring disease, the clinical manifestations of discomfort or pain in the teeth when chewing, check the crowns are mostly Defect larger, or fillings. At present, the most effective treatment is root canal therapy, in the course of treatment, divided into conventional root canal therapy and disposable root canal treatment of two methods. Conventional root canal therapy patients need multiple referrals and long course of treatment, some patients can not complete treatment for some reason. One-time root canal therapy is a complete preparation of root canal, flushing, disinfection, filling, shrinking