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
外形,牙合面磨耗程度,髓室底形态,尖孔数目
;游
卡尺测
各项长度指尖孔到牙顶点的距离;
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:肉眼观察近颊外形,牙合面磨耗程度,髓室底形态,尖孔数目;游卡尺测各项长度指尖孔到牙顶点的距离;
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