A radiographic study of tongue posture at rest and during the phonation of /s/ in class III malocclusion.
A radiographic study of tongue posture at rest and during the phonation of /s/ in class III malocclusion.
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对 III 类错牙合中静止时和发 /s/ 时舌头姿势的放射学研究。
作者：
A. Guay;D. L. Maxwell;R. Beecher
本研究对一组安氏III类错牙合患者进行了X线片研究，以确定/S/在休息和发声时的舌位。还对他们的言语和听力进行了评估。所有受试者的听力都正常，而这组中的12人中有11人表现出某种程度的嘶嘶声失真。在休息时，这些三级受试者的舌头姿势比正常情况下更低，更后倾。在/S/发声期间，这些人还表现出舌头后缩，明显试图实现舌尖与上颌前牙的正常关系，增加了下颌凹陷量，并使舌尖与下颌前牙之间的距离超过正常距离。尽管这些患有III类错牙合的个体表现出代偿运动，但在所研究的12名受试者中，只有1名被试表现出正常/S/生产。这与Sutelny、Mestre和Subtelny所证明的导致正常/S/生产的成功补偿形成对比，在许多患有III类1分类错牙合的人中可以看到。
In this investigation a group of individuals with Angle Class III malocclusions were studied radiographically to determine their tongue posture at rest and during phonation of /s/. Their speech and hearing was also evaluated. All of the subjects had normal hearing, while eleven of the twelve in the group showed some degree of sibilant distortion. At rest, these Class III subjects demonstrated a tongue posture that was lower than normal and more retruded. During the phonation of /s/ these individuals also demonstrated retrusion of the tongue in an apparent attempt to achieve a normal relationship of the tongue tip to the maxillary anterior teeth, an increased amount of mandibular depression, and a greater than normal distance between the tongue tip and the mandibular anterior teeth. Despite the compensatory movements exhibited by these individuals with Class III malocclusions, normal /s/ production was found in only one of the twelve subjects studied. This is in contrast to the successful compensations that result in normal /s/ production seen in a great number of individuals with a Class III, Division 1 malocclusion, as demonstrated by Subtelny, Mestre and Subtelny.