Objective: To explore the use of dental operating microscope with ultrasonic instruments in root canal retreatment.
目的：探讨牙科手术显微镜结合超声工作器械进行根管再治疗的临床应用效果。
The success rate of root canal retreatment can be increased by proper management with micro-ultrasonic technique and warm vertical technique.
合理、完善的治疗操作结合显微超声技术和热牙胶充填可有效提高根管再治疗的成功率。
Methods: the total of 232 root canal in 159 teeth of 135 patients who need root canal retreatment of the permanent molar were treated by using dental operative microscope and ultrasonic technique.
方法：对135例需要恒磨牙根管再治疗患者的159颗恒磨牙(232个根管)用显微超声技术进行再治疗，按牙位及治疗原因分类，比较成功率。
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