根管系统虽较为复杂，但主要是双根管和三根管型。
The root canal systems were comparatively complex, but most of them were most of double three canals.
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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