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本文取材于乌鲁木齐市五个医院口腔科门诊,从牙病患者拔出的牙齿中选出110例上颌第一磨牙,其中左侧60例,右侧50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的位置。为国人牙体形态学提供常数,并为口腔科医生做牙病治疗和修复时参考。在牙体外形方面所得的各项数据与前人所得结果相近,牙冠分型是根据牙冠颊舌径与近远中径长度的不同分为三型,颊舌径大于近远中径者共101例,约占92％,二径相等者共7例,约占6％,颊舌径小于近远中径者共2例,约占2％。(牙合)面沟的形态可分成四型,
Based on five outpatient dental clinics in five hospitals in Urumqi, 110 cases of maxillary first molars were selected from the teeth extracted from dental patients, including 60 on the left and 50 on the right. The shape of the tooth body was measured with a vernier caliper. Thereafter, the tooth was transected at the neck of the tooth to measure the size of the pulp cavity and the position of the root canal orifice. For the Chinese tooth morphology to provide a constant, and for dentists to do dental treatment and repair reference. The results obtained in the shape of the tooth profile and the results obtained by the predecessors close, crown classification is based on the diameter of the crown and the radius of the proximal and distal caliber is divided into three types, the bucco-lingual diameter greater than the short-range diameter A total of 101 cases, accounting for 92%, equal diameter of a total of 7 cases, accounting for about 6%, the buccal diameter less than the diameter of the proximal and distal were 2 cases, accounting for about 2%. (Occlusal) ditch the shape can be divided into four types,