目的：评价正畸扩弓矫治安氏Ⅰ类少年病例的临床疗效。方法：纳入14例10～14岁安氏Ⅰ类扩弓非拔牙改良扩弓器矫治病例，对矫治前后的研究模型进行激光三维扫描与测量。通过矫治前后模型的 ICON 指数和头颅侧位片，对矫治后磨牙建(牙合)、咬合关系及软组织侧貌等进行评价，用曲面断层片评价矫治后各牙的牙根平行状况。结果：14例患者矫治后牙弓宽度增加（P ＜0．05），其中前磨牙区宽度变化最大，上下颌分别增加（6．94±2．518）mm、（5．99±1．990）mm。ICON 疗效分析显示患者矫治后咬合明显改善，(牙合)关系良好。头颅侧位片提示软组织侧貌协调，面型满意；曲面断层片显示牙根平行状况良好。结论：应用扩弓进行非拔牙矫治，对固定扩弓器整体支抗作用进行利用和细致的临床操作，可获得满意的矫治效果。%Objective:To investigate efficacy of modified expander in the treatment of non-extraction patients with Angel Ⅰ maloccul-sion.Methods:1 4 Angel Ⅰcases aged 1 0 -1 4 years treated by non-extraction and fixed rapid expander.Jaw bones of the cases were laser scanned before(T1 )and after treatment(T2).The differences of arch width and length between T1 and T2 were analyzed.The In-dex of treatment complexity,outcome and need(ICON)was used to assess the pre-treatment and post-treatment study models.Data were statistically analysed with SPSS1 3.0 software.Results:The arch width increased significantly from T1 to T2.Good occlusal rela-tionship and soft tissue profiles were achieved in all cases.All cases were evaluated as greatly improved by ICON.Conclusion:AngelⅠ malocclusion can be treated successfully by increasing arch width with fixed rapid expander technique without tooth extraction.
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