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调查７３１例正畸患者的全颌曲面断层Ｘ线片，其中男性３０６人、女性４２５人，年龄７～２８岁，统计其恒牙先天缺失情况，第三恒磨牙缺失未作统计，恒牙先天缺失者６４人，缺失牙１０５颗，缺牙率为８．７６％，其中男性缺牙者２１人，缺牙率为６．８６％；女性缺牙者４３人，缺牙率为１０．１２％，男女缺失牙发生率无显著差别，同名牙双侧对称缺失与单侧不对称缺失无明显差异；缺失牙在下颌明显多于上颌；左右侧无差别；缺失２颗牙以下者明显多于４颗牙以上者。缺牙最多发生在下颌切牙，依次为上颌侧切牙和下颌第二前磨牙。
A total of 731 orthodontic patients were examined by X-ray of total jaw curved surface, including 306 males and 425 females, aged from 7 to 28 years old, whose congenital absence of permanent teeth was counted, the absence of the third permanent molars, 64 missing persons, 105 missing teeth and missing teeth rate of 8.76%, of whom 21 were male missing teeth, the rate of missing teeth was 6.86%; 43 female missing teeth, and the rate of missing teeth was 10.12 %, No significant difference in the incidence of missing teeth between men and women, with the same name bilateral bilateral symmetry loss and unilateral asymmetry loss was no significant difference; missing teeth in the mandible was significantly more than the maxillary; left and right no difference; missing two teeth less than the following 4 teeth or more. The largest number of missing teeth occurred in mandibular incisors, followed by maxillary lateral incisors and mandibular second premolar.