无鼾人群开口过程中上气道变化的磁共振研究

目的 探索下颌开口运动中上气道截面积的逐步变化,并进一步研究下颌形态特征对其的影响。方法 受试者为14名无鼾成年男性。使用特制口腔装置从下颌最大前伸位的75％(F_(75)V_0)开始,依次调节至50％(F_(75)V_(50)),75％(F_(75)V_(75)),100％(F_(75)V_(100))的张开量处。在包括初始位置在内的5个位置上进行上气道的磁共振影像扫描。为消除体格差异,上气道各平均截面积变化量(mean％)和最小截面积变化量(min％)为相对于初始上气道的计算校正值。使用头影测量分析下颌形态特征。结果与结论 在下颌开口运动中,尽管消除了体格影响,上气道的变化仍然表现出较大的个体差异。上气道的改变量与某些下颌特征存在相关关系。

A magnetic resonance imaging study of upper airway in awake non-apneic individuals during jaw opening

Objective To examine adaptive changes in the cross-sectional area (CSA) of the upper airway during jaw opening; furthermore, to explore if these changes have any direct relationship with the morphological feature of the mandible. Methods 14 non-apneic adult males participated in the study. A custom-made oral device was used to keep the mandible in titrated jaw opening at 0%(F75 V0 ) , 50% (F75 V50), 75% (F75V75), 100% (F75 V100 ) of the maximum gape with 75% of the maximum advancement,. Magnetic resonance imaging was used to investigate the difference in the upper-airway CSA in 5 positions. To eliminate excessive individual influence, changes in the mean (mean%) and minimum (min%) CSA of the upper-airway were calculated as the percentage of the CSA at F0 V0. Cephalograms were taken to analyze the morphological feature of the mandible. Results and Conclusion The change in the upper-airway size varied individually during jaw-opening even with elimination of excessive individual influence. The changes of upper-airway showed significant associations with some morphological features of the mandible.