目的：探讨控根辅弓对直丝弓矫治器患者的上颌切牙转矩效果。方法：选择22例安氏Ⅱ1拔牙矫治的患者，采用直丝弓矫治器矫治，在精细调整阶段配合控根辅弓对过度直立或内倾的上颌切牙进行正转矩。按主弓丝不同分为2组，14例主弓丝为0．46 mm ×0．64 mm 的不锈钢方丝，8例主弓丝为0．46 mm 的不锈钢圆丝。对22例上颌切牙转矩前后的 X 线头影测量结果采用 t 检验进行统计分析。结果：22例上颌切牙转矩后的 X 线头影测量结果显示，1-SN、UIa-NA 值增加（P ＜0．01），控根辅弓对上切牙的正转矩效果明显；转矩的时间，主弓丝为圆丝上颌切牙转矩快于主弓丝为方丝，P ＜0．05。结论：在直丝弓矫治的精细调整阶段，配合前牙控根辅弓，是对内收后过度直立或舌倾的上颌切牙实现转矩的简单、有效的方法。%Objective:To explore the torque effect of controlling root auxiliary arch on the straight wire appliance on maxillary anterior teeth.Methods:22 patients with class Ⅱ1 extraction treatment,treated with straightwire appliance,at the detailing treatment stage were treated with controlling root auxiliary arch over the erect or introverted maxillary incisors for positive torque.The main arch wire of 0.46 mm ×0.64 mm stainless steel edge wire was used in 14 cases,the main arch wire of 0.46 mm stainless steel round wire was used in 8 cases.Cephalometric results before and after maxillary incisor torque were analyzed by t test.Results:After maxillary incisor torque in the 22 cases 1-SN and UIa-NA value increased(P <0.01),positive torque was achieved by controlling root auxiliary arch on the upper incisors;the round wire maxillary incisor torque worked faster than the edge wire(P <0.05).Conclusion:At the detailing stage of treatment straight wire appliance on front teeth,controlling root auxiliary arch is simple and effective in the treatment of exces-sive erect or lingual inclination of maxillary incisor.
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