Abstract
The purpose of this study was to investigate acoustically the influence of orthognathic surgery on the phonetic quality of patients with skeletal mandibular protrusion. Samples of speech sounds were collected from nine patients (seven females, two males) before and after orthognathic surgery.The psychoacoustic analysis was carried out by 24 examiners using the paired comparison in naturalness of the five different Japanese words.The acoustic analysis, based on the linear predictive coding (LPC), were applied to determine the lowest two local spectral peaks (Fl, F2) on the vowels. Fl and F2 were compared with the normal speakers, and the changes of Fl and F2 with orthognathic surgery were evaluated using 40 Japanese words.The results were as follows:1) The naturalness of speech has been improved in most patients after orthognathic surgery in the psychoacoustic analysis.2) Distribution of Fl and F2 in patients after surgery approximated that of normal speakers.3) The psychoacoustic and acoustic analyses have a significant correlation. It was suggested that improvement in naturalness of speech is associated with the changes of Fl and F2 by orthognathic surgery.
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