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目的:轻弹力牵引和Laceback在排齐阶段对牙列影响的比较研究。方法:40例拔除2个上颌第一前磨牙病例,使用徐氏直丝弓矫治器矫治,随机分成两组,分别使用轻弹力牵引和Laceback牵引尖牙,排齐前后牙列的比较研究。结果:轻弹力牵引组平均疗程3.15个月,明显短于Laceback组的5.01个月(P﹤0.05),说明使用轻弹力牵引疗程更短。轻弹力牵引组尖牙发生冠远中倾斜移动较明显,磨牙少量近中腭向旋转,Laceback组则不明显。结论:轻弹力牵引组疗程明显短于Laceback组,较快地达到排齐牙列的目标。磨牙近中倾斜,并出现少量近中腭向旋转,可采取加强磨牙支抗措施。轻弹力牵引组尖牙主要以冠远中倾斜移动为主,Laceback组主要是尖牙整体远中移动,说明Laceback对尖牙移动的控制较稳定。
OBJECTIVE: To compare the effects of light stretch traction and Laceback on dentition during alignment. Methods: Forty cases of maxillary first premolar were extracted and treated with Tsui Straight wire appliance. They were randomly divided into two groups. They were treated with light stretch traction and Laceback traction canine respectively. Results: In the light stretch traction group, the average course of treatment was 3.15 months, which was significantly shorter than 5.01 months in the Laceback group (P <0.05), indicating that the treatment with light stretch traction was shorter. Light elastic traction group canine crown occurred far more tilt shift more obvious, a small amount of molar near the palatal rotation, Laceback group was not obvious. CONCLUSIONS: The light stretch traction group was significantly shorter than the Laceback group and achieved faster alignment of the dentition. Molars near tilt, and a small amount of near-mid-palate to rotate, can take to strengthen the molar support measures. Light stretch traction group canines mainly in the crown tilt in the main shift, Laceback group is mainly fangs move the whole distance, indicating Laceback on canine movement control more stable.