拔牙矫治对安氏Ⅰ类错畸形上气道矢状径的影响

Effects of extraction orthodontic treatment on the upper airway dimensions in patients with class I malocclusions

目的探讨安氏Ⅰ类错畸形拔牙矫治前后上气道矢状径的变化。方法选取青少年骨性安氏Ⅰ类牙列拥挤或双牙弓前突患者19例,拔除4颗第一双尖牙,采用直丝弓矫治技术进行矫治,疗程为22～27个月。将矫治前后的X线头颅侧位定位片进行上气道矢状径相关指标的测量,并将结果进行统计分析。结果安氏Ⅰ类错畸形拔牙矫治前后除SPP-SPPW的变化差异有统计学意义外(P<0.01),上气道矢状径的其他测量指标变化差异均无统计学意义(P>0.05)。结论拔牙矫治对青少年安氏Ⅰ类错畸形上气道矢状径的影响较小。

Objective To investigate the effects of extraction orthodontic treatment on the upper airway dimensions in adolescent patients with class Ⅰ malocclusions. Methods Nineteen adolescent patients with class Ⅰ crewding or bimaxillary protrusion malocclusions who were orthodontically treated by straight wire appliance and with 4 premolar extraction were studied. The period of the correction was 22 to 27 months. Cephalometric analysis of each patient were performed before and after treatment on the sagittal upper airway dimensions. The measurements were tested by statistical analysis. Results After extraction treatment, the chang of most measurements of upper airway showed no significant difference （ P 〉 0.05 ） except the measurements of SPP-SPPW （ P 〈 0. 01 ） in the patients of class Ⅰ malocclusions after the extraction treatment. Conclusion The effects of extraction orthodontic treatment on the upper airway dimensions in adolescent patients with class Ⅰ malocclusions was limited.