上颌骨向前发育，下颌骨后退，下颌平面角无明显增大，上下颌骨间不调改善，鼻唇角减小，面型明显改善。

Maxilla grew forward, mandible moved back. The mandibular plane Angle had no significant change. The discrepancy between maxilla and mandible were improved.

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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）。

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 ).

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