title: Stability of pre-orthodontic orthognathic surgery depending on mandibular surgical techniques: SSRO vs IVRO.
abstract: The aim of this retrospective cohort study was to evaluate the postoperative stability of sagittal split ramus osteotomy (SSRO) and intraoral vertical ramus osteotomy (IVRO) in pre-orthodontic orthognathic surgery (POGS) for skeletal Class III malocclusion. Thirty-seven patients (SSRO, n = 18; IVRO, n = 19) who underwent bimaxillary surgery were divided into two groups according to the type of surgery. During the postoperative period, there were no significant differences in anterior and superior movements of the mandible at point B between the two groups, but occlusal plane angle of the SSRO group significantly decreased more than that of the IVRO group (P = 0.003). Only the SSRO group showed a linear relationship between the amount of postoperative horizontal and vertical movements of the mandible (R(2) = 0.254; P = 0.033), indicating that the amount of postoperative upward movement of the mandible increased as the amount of postoperative forward movement increased (r = -0.504; P = 0.033). The mandible after SSRO in POGS rotated counterclockwise due to rigid fixation between two segments, whereas the mandible after IVRO without rigid fixation in POGS moved mainly in a superior direction. These differences must be considered before surgery to ensure postsurgical stability for patients with mandibular prognathism.
authors.affiliation: Department of Orthodontics, Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, South Korea.
authors.forename: Sung-Hwan
authors.initials: SH
authors.lastname: Choi
authors.affiliation: Department of Orthodontics, Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, South Korea.
authors.forename: Ho Jin
authors.initials: HJ
authors.lastname: Yoo
authors.affiliation: Private Clinic, Smileagain Dental Clinic, 121, Teheran-ro, Gangnam-gu, Seoul 06133, South Korea.
authors.forename: Jang-Yeol
authors.initials: JY
authors.lastname: Lee
authors.affiliation: Department of Oral & Maxillofacial Surgery, College of Dentistry, Yonsei University, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, South Korea.
authors.forename: Young-Soo
authors.initials: YS
authors.lastname: Jung
authors.affiliation: Department of Plastic and Reconstructive Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, South Korea.
authors.forename: Jong-Woo
authors.initials: JW
authors.lastname: Choi
authors.affiliation: Department of Orthodontics, Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, South Korea. Electronic address: orthojn@yuhs.ac.
authors.forename: Kee-Joon
authors.initials: KJ
authors.lastname: Lee
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D019248:Jaw Fixation Techniques; D008297:Male; D008313:Malocclusion, Angle Class III / Q000601:surgery*; D019340:Osteotomy, Le Fort; D059229:Osteotomy, Sagittal Split Ramus / Q000379:methods*; D012189:Retrospective Studies; D016896:Treatment Outcome; D014716:Vertical Dimension
keywords: Intraoral vertical ramus osteotomy; Postoperative stability; Pre-orthodontic orthognathic surgery; Sagittal split ramus osteotomy