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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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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Results: Under the increased bite force, periodontal ligament width was enlarged and new bone was formed in alveolar the expression of IL-6 increased apparently in periodontal cells.

结果：咬合力增强引起牙周膜增宽、牙槽骨新骨形成。 牙周细胞中IL-6表达较正常咬合力时明显增强。

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