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对70例拔牙矫治的恒牙列上颌牙拥挤的患者治疗前后模型,进行了测量和分析,讨论了拔牙矫治的适应证、拔牙的数目和拔牙的部位等。70例患者的年龄为11～25岁,女性多于男性。拥挤程度为5～17毫米。结果说明;拥挤程度小于10毫米者,大多拔一个牙矫治;拥挤程度在10～17毫米者,大多拔两个牙矫治。拔牙矫治后在牙弓中可能留下剩余间隙或仍然有
70 cases of maxillary teeth crowding patients with tooth extraction were treated before and after treatment of the model were measured and analyzed to discuss the indications for tooth extraction, the number of tooth extraction and tooth extraction sites. 70 patients aged 11 to 25 years, more women than men. Crowded degree of 5 to 17 mm. The results show that the degree of congestion is less than 10 millimeters, most of them pull a tooth correction; crowded degree of 10 to 17 millimeters, most of them pull two teeth correction. Tooth extraction may result in residual gaps in the dental arch or still have