目的：为适用于中国人的直丝弓矫治器提供基础数据。

Objective: to provide the basic data for the straight wire appliance which is suitable to Chinese.

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目的观察直丝弓矫治器对双牙弓前突病例的矫治效果。

Objective To observe the results of treatment with Straight Wire Appliance(SWA) in bimavillary alarch protrusion cases.

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目的：评价标准方丝弓配合高位J钩对正畸治疗中牙根吸收的影响。

PURPOSE: The purpose of this study was to evaluate the effect of high pull J hook headgear(HPHG) on root resorption of maxillary incisors during orthodontic treatment.

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