Yeon-Joo Kim1, Yoonjung Lee2, Youn-Sic Chun3, Nara Kang4, Sun-Jong Kim5, Minji Kim6. 1. Former Student, Division of Orthodontics, School of Medicine, Ewha Womans University, Seoul, Korea. 2. Fellow, Division of Orthodontics, School of Medicine, Ewha Womans University, Seoul, Korea. 3. Professor, Division of Orthodontics, School of Medicine, Ewha Womans University, Seoul, Korea. 4. Department of Oral and Maxillofacial Surgery, New Face Surgery, Seoul, Korea. 5. Associate Professor, Division of Oral and Maxillofacial Surgery, Department of Dentistry, School of Medicine, Ewha Womans University, Seoul, Korea. 6. Assistant Professor, Division of Orthodontics, School of Medicine, Ewha Womans University, Seoul, Korea. Electronic address: minjikim@ewha.ac.kr.
Abstract
PURPOSE: Postsurgical changes in the condylar position are of great importance to surgical stability, especially in asymmetric double-jaw surgery. The aims of this study were to evaluate positional changes of the condyle up to 12 months after surgery in patients with Class III malocclusion and to identify the factors affecting postsurgical condylar position. MATERIALS AND METHODS: The study included 33 adult patients diagnosed with skeletal Class III malocclusion who underwent bimaxillary surgery and had full cone-beam volumetric imaging (CBVI) records up to 1 year after surgery. The CBV images were obtained before surgery and 2 weeks, 3 months (T2), 6 months (T3), and 12 months after surgery. Condyles with deviated and nondeviated sides were examined separately regardless of the degree of asymmetry. Analyses of variance and multiple regression analysis were performed to identify factors that could affect the position of the mandibular condyles. RESULTS: The condyles exhibited anterior displacement at T2, which returned to a more distal position afterward in the axial view, and an inward rotation in the coronal view up to T3. From the sagittal view, the deviated and nondeviated condylar sides rotated forward and remained stable after T2. The degree of menton deviation affected the angle of condylar rotation (horizontal angle). CONCLUSION: The results of this study suggest that condyles tend to move in a certain direction, and this can influence postsurgical relapse up to 6 months after surgery. However, they remain relatively stable afterward.
PURPOSE: Postsurgical changes in the condylar position are of great importance to surgical stability, especially in asymmetric double-jaw surgery. The aims of this study were to evaluate positional changes of the condyle up to 12 months after surgery in patients with Class III malocclusion and to identify the factors affecting postsurgical condylar position. MATERIALS AND METHODS: The study included 33 adult patients diagnosed with skeletal Class III malocclusion who underwent bimaxillary surgery and had full cone-beam volumetric imaging (CBVI) records up to 1 year after surgery. The CBV images were obtained before surgery and 2 weeks, 3 months (T2), 6 months (T3), and 12 months after surgery. Condyles with deviated and nondeviated sides were examined separately regardless of the degree of asymmetry. Analyses of variance and multiple regression analysis were performed to identify factors that could affect the position of the mandibular condyles. RESULTS: The condyles exhibited anterior displacement at T2, which returned to a more distal position afterward in the axial view, and an inward rotation in the coronal view up to T3. From the sagittal view, the deviated and nondeviated condylar sides rotated forward and remained stable after T2. The degree of menton deviation affected the angle of condylar rotation (horizontal angle). CONCLUSION: The results of this study suggest that condyles tend to move in a certain direction, and this can influence postsurgical relapse up to 6 months after surgery. However, they remain relatively stable afterward.
Authors: J T Zupnik; M Ioshida; M Yatabe; A C O Ruellas; L R Gomes; S Aronovich; E Benavides; S P Edwards; B Paniagua; L H S Cevidanes Journal: Int J Oral Maxillofac Surg Date: 2019-02-01 Impact factor: 2.789
Authors: Daniel Holzinger; Katrin Willinger; Gabriele Millesi; Kurt Schicho; Elisabeth Breuss; Florian Wagner; Rudolf Seemann Journal: Sci Rep Date: 2019-02-18 Impact factor: 4.379
Authors: Jeroen Liebregts; Frank Baan; Pieter van Lierop; Martien de Koning; Stefaan Bergé; Thomas Maal; Tong Xi Journal: Sci Rep Date: 2019-02-28 Impact factor: 4.379