Tachimura Takashi, Nohara Kanji, Fujita Yoshinori, Wada Takeshi
Division for Functional Oral Neuroscience, Graduate School of Dentistry, Osaka University, Yamada-Oka, Suita, Osaka, Japan.
Cleft Palate Craniofac J. 2002 Sep;39(5):503-8. doi: 10.1597/1545-1569_2002_039_0503_cilvpm_2.0.co_2.
The purpose of this study was to examine whether a speech-aid prosthesis normalizes the activity of the levator veli palatini muscle for patients with cleft palate who exhibit velopharyngeal incompetence.
Each subject was instructed to produce repetitions of /mu/, /u/, /pu/, /su/, and /tsu/ and to blow with maximum possible effort. Electromyographic (EMG) activity of the levator veli palatini muscle was recorded with and without a hybrid speech-aid prosthesis in place.
The participants were five patients with repaired cleft palate who were routinely wearing a hybrid speech-aid prosthesis.
With the prosthesis in place, the mean value of levator activity changed positively in relation to oral air-pressure change during blowing. Differences in levator activity in relation to speech samples were similar to those in normal speakers. With the prosthesis in place, levator activity for speech tasks was less than 50% of the maximum levator activity for all subjects. The findings were similar to those reported previously for normal speakers.
Placement of the prosthesis changed EMG activity levels of the levator veli palatini muscle to levels that are similar to normal speakers. It is possible that, with the increase in the differential levator activity between speech and a maximum force task, the velopharyngeal mechanism has a greater reserve capacity to maintain velopharyngeal closure compared with the no-prosthesis condition.
本研究旨在探究语音辅助假体是否能使腭咽功能不全的腭裂患者的腭帆提肌活动恢复正常。
指导每位受试者重复发/mu/、/u/、/pu/、/su/和/tsu/音，并尽可能用力吹气。在佩戴和不佩戴混合语音辅助假体的情况下，记录腭帆提肌的肌电图（EMG）活动。
参与者为五名已修复腭裂的患者，他们日常佩戴混合语音辅助假体。
佩戴假体时，吹气过程中腭帆提肌活动的平均值随口腔气压变化呈正向改变。与语音样本相关的腭帆提肌活动差异与正常说话者相似。佩戴假体时，所有受试者语音任务中的腭帆提肌活动均小于其最大腭帆提肌活动的50%。这些发现与之前报道的正常说话者的情况相似。
假体的佩戴使腭帆提肌的肌电图活动水平改变至与正常说话者相似的水平。与不佩戴假体的情况相比，随着语音和最大用力任务之间腭帆提肌活动差异的增加，腭咽机制可能具有更大的储备能力来维持腭咽闭合。
