The SD rats were killed at 1, 2, 3, 4 weeks and mandibular molar teeth X-ray were taken.
方法建立大鼠根尖周炎动物模型，于术后1、2、3、4周取下颌骨组织，摄X线牙片、制作石蜡切片；
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。
Objective: To develop a new method for constructing database of standard artificial complete crown of mandibular molar.
目的：尝试构造标准人造全冠数据库的方法。
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