摆式矫治器结合直丝弓矫治器治疗Ⅱ类错的疗效分析

目的 分析安氏Ⅱ类错患者经摆式矫治器结合直丝弓矫治器治疗后的牙颌面结构变化,探讨此方法建立正常咬合关系的机制。方法 选择牙源性安氏Ⅱ类错患者24例,在治疗前(T1期)、推磨牙向远中后(T2期)、直丝弓矫治结束后(T3期),拍摄头颅定位侧位片。采用SPSS12.0软件包进行配对t检验。结果 ①T1期-T2期,上颌第一二磨牙均远中移动,但伴随着上颌切牙唇倾、第一前磨牙近中移动并倾斜、第一磨牙远中倾斜及下颌平面顺时针旋转等副作用。②T1期-T3期,下颌综合长度、前下面高和升支高度增加显著(P<0.01)。上颌第一前磨牙、第一磨牙的矢状向位置无显著性差异,切牙唇倾2.9°(P<0.05)。即使增强了支抗控制,固定矫治阶段上颌第一磨牙近中移动3.0mm(P<0.01)。结论 摆式矫治器可以有效的远中移动上颌磨牙,但是Ⅰ类磨牙关系的建立是颌骨差异性生长和牙齿移动的综合结果。

Posttreatment evaluation of pendulum appliance followed by fixed orthodontic treatment

Objective To analyze molar distalization with the dendulum appliance,its effect on the anchorage teeth,and the outcome at the completion of orthodontic treatment.Methods Lateral cephalograms of 24 adolescents (13 girls,11 boys), taken after pretreatment,after distalization,and after fixed orthodontic treatment, were evaluated.The mean age of the subjects at the time of the pretreatment radiograph was 11.6 years.Results The pendulum appliance distalized the maxillary molars,but there was significant loss of ...