根管治疗术是牙髓病、尖周病的一种常用有效的治疗方法。在根管治疗术中清除根管内的感染源是治疗的关键,通过根管预备和根管消毒达到清除感染源目的。但对于根管弯曲、狭窄或钙变牙齿进行根管预备难度较大。因此本文作者进行根管预备时采用ＬａｒｇａｌＵｌｔｒａ化学扩根的蝥 Root canal therapy is a common and effective treatment for endodontic and periapical diseases. In the root canal treatment of root canal infection during the removal of the source of infection is the key to treatment, root canal preparation and root canal disinfection to clear the source of infection. But for the root canal bending, narrow or calcified tooth root canal preparation more difficult. Therefore, the author of this article uses LargalUltra chemically amplified root canal preparation