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对于首次根管治疗失败的病例,非手术性根管再治疗术是其首选的治疗方法.能否有效去除根管内的充填材料是根管再治疗术的关键步骤,也是决定再治疗成功的重要因素.机用镍钛锉能有效去除根管内的充填材料,因其操作简单,工作效率高,在临床中广泛应用.近年来,用于根管再治疗的镍钛锉种类不断丰富,且各具特点,本文就根管再治疗中所应用的主要机用镍钛锉的种类、特点及其对根充物的清除效果和安全性等作一综述.“,”Nonsurgical retreatment is the primary therapeutic option when the fist root canal therapy failed. The complete removal of the original filling materials in the root canal is not only the key step of the operation but also the important factor determining the success of treatment. Due to the easy operation and high efficiency in removing fill-ing materials,the nickel titanium files have been widely used in clinic.With the improvement of materials and design, and their types are abundant in recent years.This review is to discuss the types,characteristics,efficacy and safety of the nickel titanium files used for endodontic retreatment at present.