【摘要】 目的 :观察应用Quad Helix(QH)扩弓器扩弓的应用效果。方法 :临床应用Quad Helix扩弓器扩弓 12例 ,测量扩弓前后第一磨牙及第一前磨牙宽度变化。结果 :所有采用QH扩弓器的患者 ,均在半年左右的时间内有效地扩大了牙弓 ,平均磨牙区宽度扩大了 8.95mm ,前磨牙区宽度扩大了 5 .7mm ,平均扩弓时间为 2 0 .75周 ,平均每周扩大后牙牙弓 0 .43mm。结论 :QH扩弓器是配合固定矫治扩弓的有效装置 ,而且优于其他类型的扩大狭窄牙弓的扩弓器更多还原

【Abstract】 objective: To evaluate the effect of Quad Helix appliance in expanding narrow dental arch. Methods: 12 cases were treated by Quad Helix appliance. The effect was evaluated by measurement of the dental arch. Results: The dental arch of all the patients was expanded in half a year.The width between the maxillary first molars increased by 8.95 mm, and the width between maxillary first premolars increased by 5.7 mm. The average time of expanding was 20.75 weeks, the expanding efficiency was 0.43 mm per week. Conclusion: Quad Helix is an effective orthodontic appliance for correction of narrow dental arch.更多还原