Objective To measure the thickness of the wall of root canal and root canal area in different cross sections of maxillary central incisors.

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。

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But before, the change residence scope limited to the cheekbone thickness, is limited, only may apply after the mild root of the tongue gas channel narrow patient.

但前徙幅度限于颊骨厚度，非常有限，仅可应用于轻度舌根后气道狭窄的患者。

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Thickness of the tooth body; Root canal therapy; Research.

牙体壁厚度；根管疗法；研究。

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