戴用高位牵引头帽后高角患者的垂直向变化

A retrospective study for vertical control with high-pull headgear in the treatment of high angle cases

目的评估高位牵引头帽对高角患者垂直向控制的有效性。方法选择40例高角拔牙正畸患者（MP—SN角〉40°），进行高位牵引，分为控制组和对照组（每组各20例），分析14项头影测量项目，以配对t检验分析每组治疗前后数据，独立样本t检验分析两组治疗前后差值。结果控制组与对照组相比，14项头影测量项目治疗变化的差异均无统计学意义（P〉0．05）。控制组治疗后Y轴角、MP—SN角、MP-FH角及U6-PP距分别平均增加1．9°、1．5°、2．3°和1．1mm，与治疗前相比，差异有统计学意义（P〈0．01）。结论高位牵引头帽不能为高角患者提供有效的垂直向控制。

Objective To assess the effectiveness of vertical control with high-pull headgear in the treatment of high angle cases. Methods Forty high angle cases （ MP-SN 〉 40°） were included in this study and all the patients were treated with extraction. Twenty patients in the study group and control group, respectively. Totally 14 cephalometric measurements were selected for the assessment. Paired t-test and independent t-test were used in the analysis. Results No significant differences were found between the two groups（P 〉0. 05）. In the study group, after treatment Y angle, MP-SN angle, MP-FH angle and U6-PP distance increased 1.9°, 1.5°, 2.3° and 1.1 mm, respectively （P〈0. 01）. Conclusions High-pull headgear could not provide effective vertical control in high angle cases.