Acoustic Characteristics and Hearing Impression of the Fricative/.INT./in Skeletal Class III Malocclusions.
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概要
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Speech disorders in patients with severe skeletal class III malocclusion are predominantly distortion, and distortion on the fricatives occurs most frequently. However, the acoustic characteristics of these distorted fricatives and the mechanisms of speech production have not been clarified.<BR>The fricative /s/ pronounced by the skeletal class ET patients before and after orthognathic surgery were acoustically analyzed, and the acoustic characteristics of the distorted fricative /s/ and the cause of distortion were reported.<BR>In this article, the fricative /∫/, which was pronounced by the orthognathic surgical patients, was acoustically analyzed to investigate the acoustic characteristics of the distorted /∫/ and the cause of distortion, and the relationship between the acoustic characteristics and the hearing impression was determined. The fricative /∫/ is the same as fricative /s/ in the manner of articulation but differs in the place of articulation.<BR>The results of this study were as follows:<BR>1) The sound pressure level of the middle frequency range, which was around 5kHz on the presurgical spectrum of the patients, was found to be lower than that of normal subjects, but the level of this range on the postsurgical spectrum rose. 2) The pressure level of the middle frequency range of the fricative /∫/ was influenced by the resonance of the vocal tract. 3) The naturality of the fricative /∫/ also improved after surgery in the results of the hearing test. Therefore, the distortion of /∫/ was caused by the deformity of the vocal tract of severe skeletal class III malocclusion.
- 特定非営利活動法人 日本顎変形症学会の論文
特定非営利活動法人 日本顎変形症学会 | 論文
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