目的评价根管显微镜和超声联合应用技术对疑难根管处理的临床应用效果。
Objective To evaluate the use of dental operating microscope and ultrasonic instruments in treating difficult root canal.
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。
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。
Objective: To explore the use of dental operating microscope with ultrasonic instruments in root canal retreatment.
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