疑难根管再治疗中显微超声技术的临床应用

目的：评价显微超声技术在疑难根管再治疗中的应用。方法：选取需要根管再治疗的前牙56颗，62个根管，在根管显微镜下，采用超声根管锉，顺利疏通根管后，常规完成根管预备和根管充填，观察并评价临床疗效。结果：62个根管中，疏通了21个钙化根管，取根管内断械6个，去除根管桩7个，寻找遗漏根管11个，修补根管侧壁穿孔6个，发现根管内吸收1个，根尖封闭10个，成功完成56颗患牙（62个根管）再治疗。结论：显微超声技术在疑难根管再治疗中可以提供有效的治疗手段，提高临床治疗成功率。

Root canal treatment of complicated anterior teeth with dental operating microscope and ultrasonic instru-ments

Objective： To evaluate the effect of dental operating microscope （DOM） and ultrasonic instruments in the management of complicated root canals. Method： 56 teeth （62 root canals） that had been treated with convention repaired before were selected for root canal therapy. The root canal of all cases were retreated with ultrasonic instruments under den- tal operating microscope. The efficient of preparation and obturation was analyzed before and after treatment. Result： The 21 calcified root canals, 6 canals blocked by instrument fragments, 7 canals blocked by post, 11 misunderstood root canals, 6 canals side hole, 1 root canal absorb inside, 10 canals with open canal system were retreated successfully. Conclusion： The use of dental operating microscope and ultrasonic instruments is proved effective in complicated tooth root canal retreatment.