Objective: To investigate the effects of tooth extraction on dental arch width and alveolar bone width.

目的：研究拔牙矫治对牙弓宽度和基骨宽度的影响。

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Conclusion (1) Insufficient basal bone width and excessive tooth size were the main causes of tooth crowding and tooth removing treatment.

结论：1 .基骨宽度不足、牙齿过大是造成牙列拥挤和拔牙矫治的主要原因。

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Results: After treatment, in maxilla the arch width and alveolar bone width between canines were in creased(P<0.01), those were decreased between second premolars(P<0.01 ).

结果：上颌矫治后尖牙间牙弓宽度和基骨宽度明显增加（P< 0 .0 1） ，前磨牙间牙弓宽度和基骨宽度明显减小（P< 0 .0 1）。

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