Maxilla grew forward, mandible moved back. The mandibularplane Angle had no significant change. The discrepancy between maxilla and mandible were improved.
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。
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Purpose To analyse the characteristics of mandibular incisor point chewing movement on frontal plane orbit in youth of normal occlusion.