Twinblock矫治器联合固定矫治器治疗骨性下颌后缩安氏Ⅱ类Ⅰ分类错

目的:通过X线头影测量分析评估用Twin-block矫治器联合固定矫治器治疗生长发育期安氏Ⅱ类Ⅰ分类错伴骨性下颌后缩患者的疗效。方法:选择9例以下颌后缩为主的安氏Ⅱ类Ⅰ分类错患者(平均年龄11.5岁)。全天戴用Twin-block矫治器4~8个月,达到预期疗效后改用固定矫治器治疗完成,测量治疗前后X线头颅定位侧位片,进行统计学分析。结果:ANB角°明显减小,覆盖及磨牙位置关系均有改变,面下1/3伸长。这些测量指标有着显著差异(P<0.05)。结论:Twin-block功能矫治使颏部前移,SNB角增加,ANB角减小;深覆深覆盖、磨牙关系及软组织面型均得到改善,表明Twin-block矫治器联合固定矫治器有效促进了下颌骨在垂直及矢状方向上的生长发育,取得明显的牙骨骼的改变。

Study on the Effect of the Twin-block Appliance and the Fixed Orthodontics Appliance on class II Division 1 Malocclusion and Retrognathic Mandible

Objective:Method:The study consisted of 9 children with class II division 1 malocclusion and retrognathic mandible.(average 11.5years old) was treated with Twin-block appliance for 4~6 months,and then undergone the Fixed treatment.The cephalometric data before and after treatment or control was analyzed statistically.Result:After treated The SNB angle increased;the SNB angle decreased,N-Me and ANS-Me increased,the overjet increased,all of which were statistically significant(P<0.05).Conclusion:The functional treatment with Twin-block appliance to make the chin moved forward,which increased the SNB degree and decreased the ANB degree.Deep overbite,deep overjet,molar relation and Class II profile were improved greatly,which indicate that Twin-block appliance promote the mandibular growth sagittally and vertically,the correction of Class II skeletal relation and soft tissue profile can be achieved.