牙列严重拥挤的边缘病例很难定义，又极富争议［１］，常见不同正畸医师对于同一病例可能出现必须拔牙、不须拔牙、可拔牙、可不拔牙等截然不同的设计方案。作者对认可的属边缘病例范畴的牙列严重拥挤进行非减数矫治的病例进行总结。１临床资料１．１一般资料收集３ａ内矫治完 Extreme crowding of the edge of the dentition is difficult to define the case, and very controversial [1], a common orthodontic orthodontist may appear in the same case must be tooth extraction, no tooth extraction, extraction, no extractions and other very different designs. The authors summarize cases of non-reduction treatment of severe crowding of dentition in the category of borderline cases. 1 clinical data 1.1 General Information Collection 3a end correction