Abstract
The changes of the palatopharyngeal sphincter's mechanism were observed in two cases who were resected the half part of soft palates because of the tumors. The voice sounds, the electromyograph of M. Levator Veli Palatini, the oral air pressure, the nasal air leakage, and the nasopharyngeal fiberscopic photograph were recorded and calculated till they attained the acceptable speech.
The results were as follows.
1. Typical defects in cle ft palate speeches were observed in both cases, including the pharyngeal fricative, after the resection of soft palates.
2. Electromyographic activities during swallowing and blowing showed the high amplitudes after the resection of the soft palates, but those during phonations had no change in the strength or pattern.
3. By the use of speech-aid, the acceptable speech were easily attained without the speech therapy.
