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本研究从乌鲁木齐市五个医院口腔科门诊拔出的牙齿中,选出79例下颌第一磨牙,其中左侧41例,右侧38例。用游标卡尺测量牙体外形。其后,平牙颈处横断牙体,测量牙髓腔大小及根管口位置。为国人牙体形态学提供常数,并为口腔科医生作牙病治疗和修复时提供参考。研究结果在牙体外形方面所得的各项数据与前人所得结果相近。牙冠的近远中径大于颊舌径者约占65％,二者相等者约占24％,近远中径小于颊舌径者约占6％。(牙合)面沟形态分型,“天”字型约占70％,“工”字型约占28％,不规则型约占2％。根长为冠长2倍以上者约占
In this study, 79 cases of mandibular first molars were selected from the dental clinics of five hospitals in Urumqi, including 41 on the left and 38 on the right. Measure the tooth shape with a vernier caliper. Thereafter, the level of cervical teeth transection of teeth, pulp cavity size and root canal position measurement. Provide a constant for the tooth morphology of Chinese people and provide a reference for stomatologists to treat and repair dental problems. The results obtained in the dental shape of the data obtained with the previous results similar. The maxillary and distal diameters of the crowns are 65% and 65%, respectively. The two equal parts account for about 24%, and the mesial and distal diameters are about 6%. (Occlusal) ditch morphological classification, “day” about 70% of the font, “workers” font about 28%, irregular about 2%. The root length of 2 times longer than the crown about accounted for