改良前方牵引器治疗前牙反牙合的牙颌面形态变化

Dentofacial changes of anterior crossbite after modified maxillary protraction therapy

目的 探讨一种前方牵引器口内固位装置的改良设计 ,并对用以矫治前牙反牙合所引起的牙颌面形态学变化进行评估。方法 选择 1 2名年龄 8.5～ 1 2岁前牙反牙合的患者 ,应用改良前方牵引器进行上颌前方牵引。牵引前后分别拍摄头颅侧位X线定位片 ,行X线片头影测量 ,测量结果进行统计学处理。结果 前牙覆盖增加 6 .5 5mm ,上齿槽座点A点平均前移 2 .6 0mm ,下颌骨位置后移 5 .6 5mm ,下颌平面角平均增加 1 .70°,上、下颌骨间位置关系明显改善。结论 改良的前方牵引器口内固位装置制作简单、固位良好、患者戴用舒适、易清洁 ,临床应用可明显改善前牙反牙合患者的面型。

Objective To introduce a modified intraoral fixed appliance for maxillary protraction and to investigate the dentofacial changes of anterior crossbite after the therapy. Methods Twelve patients with anterior crossbite were treated with modified protraction therapy. The cephalometric analysis was used to evaluate the changes. Results After active treatment, the overjet correction was 6.55 mm. A point moved forward 2.6 mm. Pg dislocated backward 5.65mm with MP-FH increased 1.7°. Esthetics was greatly enhanced. Conclusion The modified maxillary protraction is recommended for easy fabrication, good retention, wearing comfortably and cleaning easily. Esthetics is greatly enhanced.