Effect of temporomandibular joint and airflow volume by changing jaw position of normal subjects and patients with sleep apnea syndrome

本研究的目的是评估是否发生实质性的气流变化，通过改变下颌位置和身体姿势在正常人和阻塞性睡眠呼吸暂停（OSA）患者。15名正常对照组（9名男性和6名女性）和15名男性OSA患者参加了这项研究。所有受试者在以下七个位置测量其最大用力吸气流量（FIF_<25-75>）曲线：a.0%颌前直立位，B。0%颌前仰位、c.50%颌前仰位、d.75%颌前仰位、e.0%颌前侧卧位、f.50%颌前侧卧位、g.75%颌前侧卧位<25-75>。另一方面，在OSA患者中，下颌位置越向前，FIF_增加越多<25-75>。但改变身体姿势并不能提高其运动能力。在正常人中，改变颌位比改变体位对FIF_的影响更大<25-75>。而在OSA患者中，改变体位比改变颌位对FIF_的影响更大<25-75>。提示50%前伸位的治疗效果与75%前伸位相似。

The aim of this study was to evaluate whether substantial airflow changes occur by changing both jaw position and body posture in normal subjects and patients with obstructive sleep apnea (OSA).15 normal controls (9 males and 6 females) and 15 male OSA patients participated in this study. All subjects were measured their maximum forced inspiratory flow (FIF_<25-75>) curve in seven positions as follows; a.0% jaw forward-upright position, b. 0% jaw forward-supine position, c.50% jaw forward-supine position, d.75% jaw forward-supine position, e.0% jaw forward-lateral position, f.50% jaw forward-lateral position, g.75% jaw forward-lateral position.Although FIF_<25-75> was increased by changing the body posture from supine to lateral in normal subjects, it wasn't increased by increasing the jaw forward position of them. On the other hand, the more jaw position forward, the more FIF_<25-75> increased in OSA patients. But it wasn't increased by changing the body posture of them. There were no significant differences between 50% forward and 75% forward jaw position in both groups.In normal subjects, change of jaw position was more effective than that of body posture for FIF_<25-75>. However in OSA patients, change of body posture was more effective than that of jaw position for FIF_<25-75>. It was suggested that the treatment effect in 50% forward position was similar in 75% forward position.