하악골 전돌증 수술 후 하악골 이동량에 따른 발음 양상에 관한 비교 연구 = Comparison of speech patterns according to the degree of surgical setback in mandibular prognathic patients

다국어 초록 (Multilingual Abstract)

After performing mandibular setback surgery, we found some changes in patterns and organs of speech. This investigation was undertaken to investigate the aspect and degree of speech patterns according to the amount of surgical setback in mandibular prognathic patients.
Thirteen patients with skeletal Class Ⅲ malocclusion were studied preoperative and postoperative over 6 months. They had undergone the mandible setback operation via bilateral sagittal split ramus osteotomy(BSSRO). We split the patients into two groups. Group 1 included patients whose degree of mandibular setback was 6mm or less, and Group 2 above 6mm. Control group was two adults wish normal speech patterns. A phonetician performed narrow phonetic transcriptions of tape-recorded words and sen-
tences produced by each of the patients and the acoustic characteristics of the plosives, fricatives, and flaps were analyzed with a phonetic computer program (Computerized Speech Lab(CSL) Model 4300B(USA) ).
The results are as fallows :
1. Genera1ly, Patients showed longer closure duration of plosives, shorter VOT(voice onset time) and higher ratio of closure duration against VOT
2. Patients showed more frequent diffuse distribution than the control group in frication noise energy of fricatives.
3. In fricatives, frequency of compact from were higher in group 1 than in group 2.
4. Generally, a short duraction of closure for /ㄹ/ was not realized in the patient's flaps. Instead, it was realized as fricatives, sonorant with a vowel-like formant structure, or trill type consonant.
5. Abnormality of the patient's articulation was reduced, but adaptation of their articulation after surgery was not perfect and the degree of adaptation was different according to the degree of surgical setback.

목차 (Table of Contents)

• Ⅰ.서론
• Ⅱ.연구대상 및 방법
• 1.연구대상
• 2.연구방법
• Ⅲ.연구성적
• 1.청각적 판단
• 2.파열음 분석
• 3.마찰음
• 4.탄설음
• Ⅳ.총괄 및 고찰
• Ⅴ.결론
• 참고문헌