Simpson R K, Colton J
Cleft Palate J. 1980 Jan;17(1):40-7.
Cephalometric x-rays were used to evaluate velar stretch in 20 normal adolescents during the production of /s/. Radiopaque markers were used so that the behaviors of both the anterior and posterior portions and the total velum cound be evaluated. Velar stretch was found in each of the subjects with the average stretch (15.19%) greater than the amount reported for 10-year-old subjects but less than the average stretch for adults. The correlation between amount of velar stretch and need ratio was not significant. The different stages of involution of adenoid tissue, which is characteristic of this age group, resulted in varying configurations of the naso-pharynx were postulated as one possible explanation for this unexpected finding. Normative data and clinical implications are presented.
在20名正常青少年发/s/音时，使用头影测量x光片来评估软腭伸展情况。使用了不透射线的标记物，以便能够评估软腭前后部分以及整个软腭的行为。在每个受试者中均发现了软腭伸展，平均伸展度（15.19%）大于报道的10岁受试者的伸展量，但小于成年人的平均伸展度。软腭伸展量与需求比率之间的相关性不显著。腺样体组织退化的不同阶段是该年龄组的特征，由此导致鼻咽部结构各异，这被认为是这一意外发现的一种可能解释。文中给出了规范性数据及临床意义。
