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作者从2721例儿童病例中随机选择50张正畸病例的全颌曲面断层 X 线片,选择的标准为:1-两侧第三磨牙牙囊在第1、2或第3发育期。2.一侧下颌第二乳磨牙为正常功能位,第二双尖牙未萌出,无拥挤迹象,恒磨牙未近中移位。3.另一侧下颌第二乳磨牙缺失,缺隙减小。根据病例记录了年龄、性别;双侧第三磨牙发育的程度,第一乳磨牙存在的情况;双侧第三磨牙倾斜的角度。测
The authors randomly selected 50 orthodontic cases of total jaw curved tomography from 2721 children. The criteria for selection were as follows: 1- The third molar was on the 1st, 2nd, or 3rd developmental period. 2. One side of the mandibular second molars as a normal function, the second pair of canines did not erupt, no signs of congestion, permanent molars not near the shift. 3. The other side of the second mandibular molars missing, the gap reduced. The age and sex were recorded according to the cases. The degree of development of bilateral third molars, the presence of the first molars, and the angle of inclination of the third molars. Measurement