片段弓与微种植体支抗拉尖牙向远中的临床应用对比研究

Comparative study of clinic effects of segmental archs and mini-implants for orthodontic anchorage on orthodontic canine distalization

目的比较片段弓技术和微种植体支抗在拉尖牙向远中的临床应用效果。方法 60例牙列拥挤,双侧对称拔除第一前磨牙且需将尖牙拉向远中的患者,随机分为2组,试验组尖牙远移时应用微种植体作为支抗,对照组则使用片段弓技术远移尖牙,测量尖牙向远中移动的距离以及磨牙近中倾斜的程度。结果试验组尖牙移动的速率为(1.428±0.072)mm/月,快于对照组(1.137±0.081)mm/月;试验组磨牙近中倾斜程度为(1.27±0.18)°,小于对照组(1.91±0.13)°。经统计学检验差异均有显著性(P<0.05)。结论使用微种植体支抗拉尖牙向远中在牙齿移动速率以及控制磨牙近中倾斜等方面优于片段弓技术。

Objective To compare the clinic effects of segmental archs and mini-implants for orthodontic anchorage on orthodontic canine distalization.Methods 60 cases of dental crowding,whose four first premolars were extracted and canine distalization was needed according to the treatment protocol,were randomly divided into 2 groups.Mini-implants were used in the cases in experimental group as orthodontic anchorage to move canine distally,and segmental archs were used in the control cases.The distances of canine distalization and the angles of anchorage molar inclination in 60 cases were measured and compared.Results The mean velocity of canine distalization in the experimental group was（1.428±0.072）mm/month,which was faster than（1.137±0.081）mm/month in the control group.The degree of molar inclination（1.27±0.18） in the experimental group was less than that in the control group（1.91±0.13）.Statistic analysis showed that there were significant differences.Conclusions The mini-implants for orthodontic anchorage can move the canine faster and control the anchorage molar better than the segmental arch.