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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The Tooth Length, Crown Length, Root Length, Cervix Width, Cervix Thickness, Crown Width and Crown Thickness were measured with a vernier caliper.

用游标卡尺分别测量牙长、冠长、根长、颈宽、颈厚、冠宽和冠厚；

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The Tooth Length, Crown Length, Root Length, Cervix Width, Cervix Thickness, Crown Width and Crown Thickness were measured with a vernier caliper.

用游标卡尺分别测量牙长、冠长、根长、颈宽、颈厚、冠宽和冠厚；

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