人工口蓋床の形態が発音に及ぼす影響に関する研究

抄録

The purpose of this study was to investigate the influence of the alteration of palatal form on pronunciation.
Three types of artificial palatal plates simulating the upper complete denture, which artificial posterior teeth position wasmore lingually than natural dentition, were made foreach dentulous subject.
Difficulty of articulatory movements and sound qualities were assessed when the subjects pronounced/sa/, /si/, /ka/, /ki/, /ci/, /hi/, and/ri/with each plate. The distortional sounds judged by auditory psychological experiment were analysed by acoustic methods, and mandibular movements during pronunciation of them were measured.
Results
1./ki/and/hi/were affected remarkably when the posterior position was more lingually, and /ri/, /ci/and/sa/were also affected.
2. The acoustic characteristics of distortional sounds were estimated by peak trajectories, supectrum envelopes, peak frequencies and sound waveforms of consonant parts, formant frequencies and formant trajectories of following vowels, and segmental durations.
3. Mandibular movements did not influence directory on the acoustic characteristics of distortional sounds. It was thought that tongue and lipsmainly influenced on those.