Abstract
1. The speech aid appliances were administered to 13 patients out of a total of 26, all of whom showed symptoms of speech defect after being operated for the cleft palate, and the remaining 13 patients were left without treatment to serve as control. Comparison was made on how many months did it take for each patient of treated group and non-treated group to succeed in passing the monosyllable intelligibility test. The results showed that the patients of treated group took in the average 6.5 months and the patients of non-treated group 11.8 months to attain the goal. 2. The speech aid appliances were administered to 4 patients with speech defects, of whom one had the submucous cleft palate and uvula bifida, two had the soft palate insufficiency and the remaining one had the mouth unsuccessfully operated for cleft palate. Measurement was conducted on these patients for their nasal emission using respectively the spirometer, the vinyl ball of 30 cm diameter and the straw tube. The application of the speech aids on these patients proved to be greatly beneficial in improving their nasal emission, intelligibility of speech and in reducing the nasal voice.
