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通过对２０例１１～１４岁恒牙早期前牙反伴拥挤Ⅱ°～Ⅲ°病例；采用前方牵引矫治器，固定矫治器等方法，不拔牙矫治均取得满意效果。对矫治前后的模型测量分析，结果表明，上颌牙弓前部长度、牙弓弧形长度明显增长，牙弓中段增宽，拥挤消失。这类错病例，１１～１４岁正是生长快速期，在适当矫治力的刺激下，可使发育不足的上颌骨加速增长，同时限制下颌骨过度发育；不仅可以排齐牙齿，解除反，而且获得更和谐的软硬组织面貌。因此，对看似拥挤严重且有前牙反的早期病例不要轻易拔牙
Through the 20 cases of 11 ~ 14 years old permanent teeth anterior crossbite accompanied by crowded Ⅱ ° ~ Ⅲ ° cases; using the front traction appliance, fixed appliance and other methods, no extractions have achieved satisfactory results. The results of measurement and analysis of the model before and after correction showed that the length of the anterior maxillary arch and the arc length of the dental arch increased obviously, and the middle part of the dental arch broadened and crowded disappeared. Such misdiagnosed cases, 11 to 14 years of age is the rapid growth period, with the appropriate correction of stimulation, can under-growth of the maxillary bone to accelerate growth, while limiting the excessive development of the mandible; not only align the teeth, lift the anti-Lu , But also get more harmonious soft and hard tissue appearance. Therefore, do not easily tooth extraction of early cases of seemingly overcrowded and anterior inverted