Maxillofacial Plastic and Reconstructive Surgery

Korean Association of Maxillofacial Plastic and Reconstructive Surgeons (대한악안면성형재건외과학회)
권호 표지

COMPARISON OF SPEECH PATTERNS ACCORDING TO THE DEGREE OF SURGICAL SETBACK IN MANDIBULAR PROGNATHIC PATIENTS

하악골 전돌증 수술 후 하악골 이동량에 따른 발음 양상에 관한 비교 연구

  • Shin, Ki-Young (Department of Oral and Maxillofacial Surgery, School of Dentistry, Wonkwang University, Wonkwang Dental Research Institute) ;
  • Lee, Dong-Keun (Department of Oral and Maxillofacial Surgery, School of Dentistry, Wonkwang University, Wonkwang Dental Research Institute) ;
  • Oh, Seung-Hwan (Department of Oral and Maxillofacial Surgery, School of Dentistry, Wonkwang University, Wonkwang Dental Research Institute) ;
  • Sung, Hun-Mo (Department of Oral and Maxillofacial Surgery, School of Dentistry, Wonkwang University, Wonkwang Dental Research Institute) ;
  • Lee, Suk-Hang (Department of English Language and Literature, College of Humanities, Wonkwang University)
  • 신기영 (원광대학교 치과대학 구강악안면외과, 원광치의학연구소) ;
  • 이동근 (원광대학교 치과대학 구강악안면외과, 원광치의학연구소) ;
  • 오승환 (원광대학교 치과대학 구강악안면외과, 원광치의학연구소) ;
  • 성헌모 (원광대학교 치과대학 구강악안면외과, 원광치의학연구소) ;
  • 이숙향 (원광대학교 인문대학 영어영문학과)
  • Published : 2001.02.28
Download PDF
⟨ Previous Next ⟩

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 sentences 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 follows: 1. Generally, 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 duration 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.

Keywords