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The purpose of this study was to investigate the influence of anterior palatal form on air pressure during the production of /sa/, /si/, /ta/ and /ci/. The subjects used were 5 male 3 female edentulous patients, whech were native Japanese speakers. Each experimental maxillary denture was fabricated and four experimental thicknesses were defined as a function of alteration in the anterior palatal counter of complete denture. The tip of aluminum tube was placed in artificial incisor teeth and the other tip was connected to a differential micropressure transducer. Air pressure and the speech signal were recorded by a digital data recorder during speech production.The results were as follows:1. Air pressure signal in each sound was characterized by the number of peaks and the time relationship to speech signals.2. The anterior palatal form of complete denture had little influence on the time relationship between the peak of air pressure and speech signals.3. The peak value of air pressure ranged between 100 and 700 Pa in /sa/, 100 and 500 Pa in /si/, 50 and 600 Pa in /ta/, and 50 and 700 Pa in /ci/. The peak values of air pressure were different among the subjects. Four experimental anterior palatal forms significantly affected peak values of air pressure (ANOVA, p<0.05).It was concluded that the anterior palatal form of complete denture affected the air pressure flown out from the upper central incisors.

Influence of Anterior Palatal Form on Speech. Part 1. Relationship to Intraoral Air Pressure.