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本文取材于牙病患者拔出的牙齿,挑选102例上颌第三恒磨牙,其中左侧55例,右侧47例。通过牙外形测量所得数据(单位-毫米)与前人比较基本接近。牙全长:左17.55±0.26(13.00~21.92),右17.75±0.31(12.36~21.78)牙冠长:左5.77±0.14 (4.00~8.74);右5.75±0.14 (3.74~7.78)。牙冠颊舌径大于近远中径者94例,约占92.16％;颊舌径小于近远中径者7例,约占6.86％,二径相等者1例,约占0.98％。牙(牙合)面沟的形态可分五型:“人”字型25例,约占24.5％;“十”字型24型,约占23.53％;“大”字型17
Based on the extracted teeth from dental patients, 102 cases of maxillary third permanent molars were selected, of which 55 on the left and 47 on the right. The data obtained by measuring the shape of the tooth (unit - mm) is basically similar to the previous one. The total length of the teeth was 17.55 ± 0.26 (13.00 ~ 21.92) left and 17.75 ± 0.31 (12.36 ~ 21.78) left. The crown length was 5.77 ± 0.14 (4.00 ~ 8.74) left and 5.75 ± 0.14 (3.74 ~ 7.78) right. There were 94 cases (92.16%) of the patients whose diameter of the crown of the crown was greater than those of the proximal and distal diameters. In 7 cases, the diameter of the buccal and linguioles was 6.86%, while the diameter of the same was equal to 0.98%. Tooth (occlusal) face ditch can be divided into five types: “person” type 25 cases, accounting for about 24.5%; “ten” type 24 type, accounting for about 23.53%; “big” type 17