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.

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前言： 目的：建立双根口服液除杂质的工艺方法。

Objective:To establish a procedure of removing the impurity in double-root oral solution.

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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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