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对34例(11例男,23例女)伴有下双尖牙拥挤的儿童(10.5岁～16.5岁,平均年龄13.9岁)以拔除第二磨牙的方法作治疗。拔牙后6个月,有21例患者下双尖牙区自然排齐;余13例自然排齐效果不理想者则用简单力学矫治器治疗下牙弓。测量拔牙前及拔牙后6个月(或治疗结束时)双尖牙区拥挤程度的改变。把测量所得数据及有关患者个人资料作统计学处理,得出结论:①下颌双尖牙拥挤量最大达4或5mm者,可伴随应用或不用简单正畸矫治器
Thirty-four children (11 males and 23 females) accompanied by congenital bicuspid crowding (10.5-16.5 years, mean age 13.9 years) were treated with removal of the second molars. Six months after tooth extraction, 21 patients were naturally aligned under the bicuspid area; while in the remaining 13 cases, the results were not satisfactory, the lower arch was treated with a simple mechanical appliance. Changes in the degree of crowding in the bicuspid area prior to and after 6 months (or at the end of the treatment) were measured. The measured data and the patient's personal data for statistical analysis, concluded: ① maxillary bicuspid crowding amount of up to 4 or 5mm, with or without a simple orthodontic appliance