Abstract:

Root canal therapy is the general treatment for endodontic and periapical disease. However，the failure of the therapy still exists. Then root canal retreatment becomes an effective way to increase the conservation rate of those teeth. The aim of retreatment is to eliminate the infected site. The success rate of retreatment is related to many kinds of factors. With the development of implant technology and endodontic surgery，the indications of retreatment have changed. Besides，Niti instruments，ultrasonic and laser technology have improved the efficiency of the retreatment.

Key words: root canal retreatment, endodontic surgery, implant restoration, ultrasonic, laser, Niti instrument

摘要：

根管治疗是牙髓病、根尖周病最常见的治疗方法。然而，根管治疗存在着失败的风险，根管再治疗就是保存根管治疗失败患牙的有效方法。根管再治疗的目的在于清除感染灶，其成功与否与很多因素相关。随着新技术如种植和根尖手术的发展，根管再治疗的适应证有所改变。同时各种镍钛器械、超声、激光技术的应用，使根管再治疗更有效。

关键词: 根管再治疗, 根尖手术, 种植修复, 超声, 激光, 镍钛锉