악교정 수술이 필요한 하악 전돌증 환자에서 자·모음의 음향학적 특성 = Acoustic Characteristics of Consonants and Vowels in Patients with Mandibular Prognathism: A Preoperative Study

다국어 초록 (Multilingual Abstract)

The aim of study is to compare acoustic characteristics of consonants and vowels between twenty patients with mandibular prognathism before orthognathic surgery and twenty controls. Participants produced /CVCV/ and /CVCCVC/ syllabic structures and sustained vowels (/i/, /e/, /u/, /o/, /a/). Acoustic measurements included formants, formant differences (F2-F1, F3-F2), formant sum (F1+F2+F3), vowel space area (VSA), vowel articulation index (VAI), bandwidth, intrinsic fundamental frequency (F0), Voice Onset Time (VOT), and duration.
Results revealed significantly lower F2 values in mandibular prognathism patients for /e/, /u/, /o/, and /a/ vowels. F2-F1 was reduced for /e/, /u/, and /o/, while F1+F2+F3 was significantly lower for /e/, /u/, /o/, and /a/. Notably, VSA was significantly reduced in the experimental group, indicating formant centralization and reduced articulatory movement. These acoustic changes reflect incomplete neuromuscular compensation for structural mandibular prognathism. Among the plosives, /p'/ and /t'/ showed prolonged VOT in patients with mandibular prognathism, suggesting an abnormal articulatory organ structural strategy. Duration of fricatives and liquids was significantly shorter, accompanied by lower center of gravity in fricative spectra.
These findings demonstrate that mandibular prognathism significantly affects acoustic-phonetic characteristics across multiple parameters, reflecting the complex interaction between structural constraints and speech motor control. Future research should examine post-surgical acoustic changes and listener perceptions of speech intelligibility.

목차 (Table of Contents)

• 제1장 서론 1
• 제2장 연구 방법 5
• 제2장1절 연구 대상 5
• 제2장2절 연구 방법 및 측정 5
• 제2장3절 평가 문형 6
• 제2장4절 음향학적 분석 6
• 제2장5절 통계 분석 7
• 제2장6절 연구의 제한점 7
• 제3장 연구 결과 9
• 제3장1절 모음의 음향학적 특성 9
• 제3장1절1항 포먼트(Formant) 9
• 제3장1절2항 대역폭(Bandwidth) 9
• 제3장1절3항 고유 기저 주파수(intrinsic fundamental frequency, F0) 9
• 제3장2절 자음의 음향학적 특성 10
• 제3장2절1항 파열음(Plosive) 10
• 제3장2절2항 마찰음(Fricative) 10
• 제3장2절3항 유음(Liquid) 11
• 제4장 총괄 및 고찰 12
• 제4장1절 모음의 음향학적 특성 비교 12
• 제4장2절 자음의 음향학적 특성 비교 14
• 제4장2절1항 파열음(Plosive) 14
• 제4장2절2항 마찰음(Fricative) 15
• 제4장2절3항 유음(Liquid) 15
• 제5장 결론 17
• 참고문헌 19