Objective: Statistical analysis of mandibular molar mesiodistal crown width and tooth length and development of root.

目的：统计分析下颌第一、第二、第三磨牙牙冠近远中宽度、牙体长度、分根情况以及相关因素。

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Objective To investigate clinical significance on correlation between the width of alae nasi and the total width of anterior teeth crown in maxilla.

目的：对上颌前牙牙冠总宽度与鼻翼宽度的相关性及临床意义的研究。

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And there are obvious difference of stemflow among different species, the main factors that affect the stemflow are crown structure, diameter breast-high and crown width.

不同树种间的树干茎流量差异极显著，影响树干茎流量的主要树体特征因子是冠型结构、胸径和平均冠幅。

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