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根管的彻底清理是根管治疗成功的最重要因素。由于根管形态学上有许多变异、沟嵴、死区及根管分支等使用普通的根管锉难以触及,其他机械清创术亦难以达到彻底去除软硬组织的目的。用超声锉去除牙本质的能力显著优于手用器械操作法,作者在本文中于体外用新拔除的牙齿按根管弯曲度和大小分对,每对中一枚牙齿用手锉按顺序号制备根管,每次扩大后皆用大量的25％次氯酸钠冲洗根管;另一枚牙齿用超声机械操作,以10号根管锉开始制备根管,用15号根管锉
Root canal cleaning is the most important factor in the success of root canal therapy. Because there are many morphological changes of root canal, ditch ridge, dead zone and root canal branch using ordinary root canal file is difficult to reach, other mechanical debridement is also difficult to achieve the purpose of complete removal of soft and hard tissue. The ability of an ultrasonic file to remove dentin is significantly superior to that of a hand-operated instrument. In this article, the authors extracorporeally removed the newly rooted teeth according to the curvature and size of the root canal. One pair of teeth in each pair was hand-filted according to the ordinal number Preparation of the root canal, each expanded with a large amount of 25% sodium hypochlorite rinse the root canal; the other tooth with ultrasonic mechanical operation, root canal preparation with root canal file No. 10, with a root canal file No. 15