但有资料表明下颌切牙的根管解剖形态较为复杂，变异较多。
However, some research data show that mandibular incisors' root canal anatomy is comparatively complex, and root canal system has many variations.
目的：观察恒切牙外伤冠折后行一次性根管治疗与断冠再接术的临床效果。
Objective To investigate the clinical effect of one-time root canal therapy and reattachment of permanent incisors with crown fracture.
目的了解正常上颌中切牙牙根不同截面根管周壁厚度及根管面积和形态。
Objective To measure the thickness of the wall of root canal and root canal area in different cross sections of maxillary central incisors.
下颌切牙中，双根管、根管分支和根管分歧都有一定的发生率。
The two root canals, root canal diverge and root canal branch et al have considerable incidence. Besides, mesial-distal root canal walls of mandibular incisor teeth are thin.
下颌切牙中，双根管、根管分支和根管分歧都有一定的发生率。
The two root canals, root canal diverge and root canal branch et al have considerable incidence. Besides, mesial-distal root canal walls of mandibular incisor teeth are thin.
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