磁力Twin-block矫治器治疗安氏Ⅱ类1分类错[牙合]

The clinical investigation of magnetic Twin-block appliance for Angle＇s class Ⅱ division 1 malocclusion

目的 观察安氏Ⅱ类1分类错[牙合]患者使用磁力Twin-block矫治器治疗前后牙颌骨结构变化情况.方法 应用磁力Twin-block矫治器和固定矫治器对15例覆盖大于10 mm.替牙晚期或恒牙早期安氏Ⅱ类1分类错[牙合]进行治疗,治疗前后拍摄头颅侧位定位片,分别观测颌骨、牙齿结构的变化,所得结果进行统计学分析.结果 磁力Twin-block治疗前后SNB增加了（1.97 ±1.01）°,ANB减少了（1.94±0.72）°,MP-FH增加了（4.80 ±1.37）°,P〈0.001,对下颌骨的矢状向、垂直向作用更明显,差异有统计学意义.结论 磁力Twin-block矫治器对替牙晚期或恒牙早期安氏Ⅱ类1分类错[牙合]进行治疗,能够促进颌骨特别是下颌骨的改建及侧貌改善.

Objective To evaluate the skeletal changes of Angle＇s class Ⅱ division 1 malocclusion patients after treatment with magnetic Twin-block appliance. Methods Fifteen Angle＇s class Ⅱ division 1 malocclusion patients （late mixed dentition or early permanent dentition） with the overjet more than 10 mm were treated using the magnetic twin-block appliance and fixed appliance. Before and after the treatment, the cephalometric radiographs were taken to observe the structure changes of the jaw and the teeth. The results were statistically analysed. Results Before and after the treatment with magnetic twin-block, SNB is increased by （1.97 ±1.01）°, ANB is decreased by （1.94 ±0.72）°, MP-FH is increased by （4.80 ±1.37）°（P 〈 0.001）. The sagittal and vertical effection on the mandible is obvious, and the difference was statistically significant. Conclusions Using magnetic Twin-block appliance on Angle＇s class Ⅱ division 1 malocclusion patients in late mixed dentition or early permanent dentition phase, can improve the bone remodeling of jaw （especially the mandible） and facial profile esthetics.