Tsuda Hiroko, Masumi Shin-ichi
Division of Occlusion & Maxillofacial Reconstruction, Department of Oral Functional Reconstruction, Kyushu Dental College.
Nihon Hotetsu Shika Gakkai Zasshi. 2005 Oct;49(5):736-43. doi: 10.2186/jjps.49.736.
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 syndrome (OSAS).
Fifteen normal controls (9 males and 6 females) and 15 male OSAS patients participated in this study. For all subjects their maximum forced inspiratory flow (FIF(25-75)) curve was measured 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, and 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 was not increased by increasing the jaw forward position of them. On the other hand, the more forward the jaw position, the more FIF(25-75) increased in OSAS patients. However, it was not increased by changing the body posture of them. There were no significant differences between the 50% forward and 75% forward jaw positions in both groups.
In normal subjects, change of jaw position was more effective than that of body posture for FIF(25-75). However, in OSAS 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 the 50% forward position was similar to that in the 75% forward position.
