Abstract
The purpose of this study was to investigate the influence of palatal form changing with the position of upper posterior artificial teeth on tongue movement for pronunciation of /s/sound. Subjects were seven males and speech material was /asa/. Two experimental palatal plates were made for each subject: a normal 1.5-mm-thick plate and the plate augmented by a 4-mm-thick lateral seal of palatal surface. Tongue-palatal contacts were measured by a dynamic palatography when wearing either of the two plates. The influence of the palatal form was estimated using the following parameters: the onset of the tongue-palate contact, maximum contact speed, the timing of the constriction for /s/, and palatogram pattern at the constriction and consonant duration for /s/.The speech behavior when wearing the augmented plate was divided into 4 groups comparing to normal plate:Group 1: Tongue-palate contact started earlier, maximum contact speed decreased and the timing of the constriction was constant.Group 2: The onset of tongue-palate contact and maximum contact speed were constant. Butthe timing of the constriction was delayed.Group 3: Tongue-palate contact started earlier, maximum contact speed decreased and thetiming of the constriction was delayed.Group 4: Temporal aspect of tongue-palate contact was constant. But the consonant durationwas shorter and abnormal palatogram pattern was observed.
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