title: Acoustic analysis of vowel sounds before and after orthognathic surgery.
abstract: The purpose of this study was to compare the articular structures and vowel sounds of patients with mandibular prognathism before and after bilateral sagittal split ramus osteotomy (BSSRO). Eight patients who underwent BSSRO to correct mandibular prognathism were selected for inclusion in this study. All patients were asked to read short words (vowels), and these sounds were recorded. Every utterance was repeated twice in four different sessions before the operation and at 6 weeks, 3 months, and 6 months after the operation. The data were analysed using Praat (ver. 5.1.31), and the formant frequencies (F1, F2) of the eight vowels were extracted. PlotFormant (ver. 1.0) was used to draw formant diagrams. The F1 and F2 of front-low vowels were reduced after BSSRO, and the articulating positions of the patients shifted in a posterior-superior direction after the procedure. Additionally, the area of vowel articulation was dramatically reduced after BSSRO but increased slowly over time.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50 Irwon-dong, Gangnam-gu, Seoul 135-710, Republic of Korea. Electronic address: awilltowin@gmail.com.
authors.forename: Jaemyung
authors.initials: J
authors.lastname: Ahn
authors.affiliation: Department of Oral and Maxillofacial Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50 Irwon-dong, Gangnam-gu, Seoul 135-710, Republic of Korea. Electronic address: gun-jong@hanmail.net.
authors.forename: Gunjong
authors.initials: G
authors.lastname: Kim
authors.affiliation: Department of Orthodontics, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50 Irwon-dong, Gangnam-gu, Seoul 135-710, Republic of Korea. Electronic address: huyyoung@skku.edu.
authors.forename: Young Ho
authors.initials: YH
authors.lastname: Kim
authors.affiliation: Department of Oral and Maxillofacial Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50 Irwon-dong, Gangnam-gu, Seoul 135-710, Republic of Korea. Electronic address: hongjr@skku.edu.
authors.forename: Jongrak
authors.initials: J
authors.lastname: Hong
mesh_terms: D000162:Acoustics; D000293:Adolescent; D000328:Adult; D001672:Biocompatible Materials / Q000737:chemistry; D001860:Bone Plates; D001863:Bone Screws; D015331:Cohort Studies; D005500:Follow-Up Studies; D006801:Humans; D008313:Malocclusion, Angle Class III / Q000503:physiopathology / Q000601:surgery; D008334:Mandible / Q000503:physiopathology / Q000601:surgery; D056948:Orthognathic Surgical Procedures / Q000379:methods*; D059229:Osteotomy, Sagittal Split Ramus / Q000379:methods*; D010700:Phonetics; D011378:Prognathism / Q000503:physiopathology / Q000601:surgery*; D011446:Prospective Studies; D013018:Sound Spectrography / Q000295:instrumentation; D013060:Speech / Q000502:physiology; D014025:Titanium / Q000737:chemistry; D055815:Young Adult
chemical_list: D001672:Biocompatible Materials; D014025:Titanium
keywords: Acoustic analysis; Bilateral sagittal split ramus osteotomy; Orthognathic surgery; Vowel sounds