垂直面型对安氏Ⅲ类错畸形牙齿移动速度的影响

Effect of different vertical craniofacial morphology types in class Ⅲ malocclusion on teeth movements speeds

目的比较3种垂直面型的安氏Ⅲ类错畸形牙齿移动速度。方法随机选取3种垂直面型的安氏Ⅲ类错畸形各24例,采用方丝弓矫治技术,以上、下颌的第一磨牙做支抗,远中移动尖牙,对尖牙向远中移动和磨牙向近中移动的速度进行比较。结果高角型病例牙齿移动速度最快,为每28 d移动0.66～1.78 mm;低角型最慢,为每28 d移动0.18～1.12 mm;均角型居中,为每28 d移动0.44～1.52 mm。安氏Ⅲ类高角、均角、低角型错牙合畸形牙齿移动速度差异有统计学意义(P<0.05)。结论 3种垂直面型对安氏Ⅲ类错牙合畸形的牙齿移动速度有显著影响。

Objective To compare the speed of teeth movements among different vertical craniofacial morphology types in class Ⅲ malocclusion cases.Methods Twenty-four high-angle cases,twenty four average-angle cases and twenty four low-angle cases were involved in this study.Modern standard edgewise orthodontic technique was used to move the canine distally,anchored with the first molar.The speed of teeth movements was compared.Results The differences in speed of teeth movements among different vertical craniofacial morphology were proved significantly.The speed in high-angle cases was 0.72-1.46 mm per 28 days,the speed in average-angle ones was 0.46-0.98 mm per 28 days and the speed in low-angle ones was 0.21-0.78 mm per 28 days.Conclusion The vertical craniofacial morphology is a critical factor affecting the speeds of teeth movements in class Ⅲ malocclusion.