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目的 应用Mini Uni-Twin(MUT)托槽系统矫治中重度牙列拥挤的患者,评价其临床矫治效果.方法 选取安氏1类牙列拥挤的患者60例,拔除4个第一前磨牙,随机分为两组并分别应用MUT托槽系统和传统直丝弓技术进行矫治,对治疗前后的头影测量项目进行统计分析,并记录所有患者的平均疗程以及矫治器戴入后的疼痛程度.结果 30例MUT患者平均疗程17.5±2.8个月,30例传统直丝患者平均疗程21.8±3.2个月,其差异有统计学意义;第一次戴入后24 h以及48hMUT组患者的疼痛明显低于传统直丝弓组;两组间治疗前后头影测量的结果并无明显差异.结论 MUT托槽系统可减轻矫治初期的疼痛,缩短疗程,是一种高效的矫治系统.“,”Objective To assess the clinical effects of Mini Uni-Twin(MUT) brackets in treating moderate to severe crowding.Methods 60 patients with moderate to severe crowding were selected and were extracted of 4 first premolars.They were divided into MUT brackets group and traditional straight wire group randomly.The results of cephalometric measurements before and after treatment were statistically analyzed.The average treatment time and pain level after bonding of all the patients were recorded.Results The average treatment time of MUT group was 17.5±2.8 months and that of traditional straight wire group was 21.8± 3.2 months.The difference was significant (P＜0.05).The pain level of MUT group was less than that of traditional straight wire group at 24 hours and 48 hours after bonding (P＜ 0.05).However,the results of cephalometric measurements of two groups have no statistical difference.Conclusions MUT bracket is an effective appliance in treating crowding patients which can reduce pain at initial treatment and shorten treatment duration.