根管治疗的成功,有赖于根管的良好预备、消毒和完全充填。现代根管解剖研究表明,根管的解剖变异很大。付根管、侧枝根管比以前认为的要多得多,根分枝极弯曲,有些牙根有第二主根管,根尖孔的位置不能依X线片上的根尖位置来断定,根管形态或三角形、或鱼尾形、或椭圆形,很不规则。根管的变异,造成根管预备的困难,器械不能达根尖,变异严重时,器械连根管壁的一半区域都难以接触到。因而,良好的根管预备、消毒和充填往往难 The success of root canal therapy depends on the good preparation, disinfection and complete filling of the root canal. Modern root canal anatomy studies have shown that anatomical variations in the root canal. Root canal, lateral root canal than previously thought to be much more, the root branch is very curved, and some roots have a second main root canal, apical foramen can not be determined by the position of the root tip on the X-ray film, root canal Morphological or triangular, or fishtail, or oval, very irregular. Root canal variation, resulting in difficulty in preparing the root canal, the instrument can not reach the apical, serious variation, the device even the root canal wall is hard to reach half the area. Therefore, good root canal preparation, disinfection and filling are often difficult