尖牙后移阶段应用双弓丝组合控制支抗的效果观察

Clinical study of Twin-wires on anchorage on canine retraction

目的:探讨正畸过程中尖牙后移阶段,采用稳定弓丝和弹性工作弓丝组合控制支抗的效果。方法:选择15例前牙严重拥挤的病例,男6例,女9例,平均年龄13.7岁,均拔除上、下颌第一前磨牙。应用0.018不锈钢丝和0.012NiTi圆丝,稳定弓丝依靠牙弓内多个牙的支持,发挥支抗力,同时利用弹性工作弓丝使尖牙后移入位。在矫治前、后模型上测量比较,判断支抗的控制效果。采用自身对照t检验对结果进行统计学分析。结果:所有患者牙弓长度和宽度在矫治前后未发生显著变化,后牙的尖窝关系也未丧失。结论:稳定弓丝和弹性工作弓丝结合使用,在移动尖牙的过程中,可以有效控制支抗。

PURPOSE： The purpose of the study was to evaluate the effects of anchorage by Twin-wires on canine retraction. METHODS： A sample of 15 patients with severe anterior crowding was selected （6 males, 9 females, age average：13.7 years）. All patients underwent removal of the four first premolars during orthodontic treatment. Retraction of canine was achieved by using 0.018 stainless steel wire and NiTi wire. Anchorage reinforcement as a result of this movement was evaluated. The length and width of the dental arch models were measured. Self-control t test was used for data analysis. RESULTS： The length and width of the dental arches, the canine and molar relationships remained unchanged after orthodontic treatment. CONCLUSION： Application of Twin-wires leads to canine retraction and sufficient anchorage consolidation.