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.
为探索混合式直丝弓矫治器治疗前牙反牙合的有效性，采用磨牙颊面管和双尖牙托槽固定在牙合垫的颊面，使牙合垫和直丝弓矫治器合二为一而成混合式直丝弓矫治器。
In order to explore the effect of the compound straight wire appliance on the correction of anterior cross-bite, molar buccal tubes and bicuspid brackets were fixed in the buccal side of occlusal pad.
方法选择拔除4颗第一双尖牙的患者2 0例，采用方丝弓技术治疗。
Methods 20 subjects were chosen with 4 first premolars extraction based on diagnosis.
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