Anterior open bite and oral port constriction.
Anterior open bite and oral port constriction.
复制标题
前牙开合和口腔收缩。
作者：
T. L. Klechak;D. Bradley;D. W. Warren
本文对10名前牙开牙合患者和10名正常人进行了摩擦音产生过程中口内气压和口腔气流速率的同步测量。根据这些测量值，计算口腔端口收缩面积，并比较两组内和两组之间的值。调查结果显示：（1）正常发音和正常咬合受试者的口孔收缩面积非常一致且可重复。(2)开咬受试者的口腔端口收缩面积显着大于对照组的所有声音。(3)研究发现，对于大多数声音，垂直缺损超过5毫米的严重前牙开牙合受试者产生的口孔开口比仅中度开牙合（3-5毫米）的受试者大得多。(4)开牙合的程度与口门收缩面积有正相关关系，随着开牙合程度的增加，口门收缩面积也随之增加，尤其是在重度开牙合组（5 mm及以上）。
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).