Klechak T L, Bradley D P, Warren D W
Angle Orthod. 1976 Jul;46(3):232-42. doi: 10.1043/0003-3219(1976)046<0232:AOBAOP>2.0.CO;2.
Intraoral air pressure and rate of oral airflow were measured simultaneously during fricative sound production in ten subjects with anterior open bite and ten subjects with normal occlusion and speech. From these measurements the area of oral port constriction was calculated and the values compared within and between the two groups. Findings revealed that: (1) The area of oral port constriction was very consistent and reproducible in subjects with normal speech production and normal occlusion. (2) The area of oral port constriction was significantly larger in open-bite subjects compared with control subjects for all sounds. (3) Severe anterior open-bite subjects with a vertical defect over five millimeters were found to produce significantly larger oral port openings than those with only moderate open bite (3-5 mm) for most sounds. (4) A direct correlation between the degree of open bite and the area of oral port constriction was found. As the amount of open bite increased, the area of the oral port increased, especially in the severe open-bite group (5 mm and over).
在十名前牙开颌受试者和十名具有正常咬合及言语功能的受试者发摩擦音时，同时测量口腔内气压和口腔气流速率。根据这些测量结果计算口腔通道收缩面积，并在两组内和两组间比较这些值。研究结果显示：（1）在言语产生正常且咬合正常的受试者中，口腔通道收缩面积非常一致且可重复。（2）所有声音的开颌受试者口腔通道收缩面积均显著大于对照组受试者。（3）发现垂直缺损超过5毫米的严重前牙开颌受试者，对于大多数声音，其口腔通道开口显著大于仅有中度开颌（3 - 5毫米）的受试者。（4）发现开颌程度与口腔通道收缩面积之间存在直接相关性。随着开颌量增加，口腔通道面积增大，尤其是在严重开颌组（5毫米及以上）。
