Methods:Macrography was used to observe the morphology of the mesiobuccal root,the degree of abrasion,the morphology of the floor of pulp cavity, the number and type of apical foramen.
方法:肉眼观察近颊根外形,牙合面磨
,髓室底形态,根尖孔数目及类型;游标卡尺测
各项长指标及根尖孔到牙根顶点的距离;
Methods:Macrography was used to observe the morphology of the mesiobuccal root,the degree of abrasion,the morphology of the floor of pulp cavity, the number and type of apical foramen.
方法:肉眼观察近颊根外形,牙合面磨,髓室底形态,根尖孔数目及类型;游标卡尺测各项长指标及根尖孔到牙根顶点的距离;
：
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