Assessment of condylar changes after orthognathic surgery using computed tomography regional superimposition |
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| Affiliation: | 1. Department of Oral and Maxillofacial Surgery, Pontifical Catholic University, Porto Alegre, Brazil;2. Private Practice, Charlotte, NC, USA;3. Advanced Orthodontic Program, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, CA, USA;4. Oral and Maxillofacial Surgeon, Private Practice, Brazil (Santa Catarina);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;6. Associate Professor, Division of Oral and Maxillofacial Surgery, Department of Dentistry, School of Medicine, Ewha Womans University, Seoul, Korea;5. Assistant Professor, Division of Orthodontics, School of Medicine, Ewha Womans University, Seoul, Korea;1. Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Geert Grooteplein 10, 6525 GA, Nijmegen, The Netherlands;2. Department of Oral and Maxillofacial Surgery, Rijnstate Hospital, Wagenerlaan 55, 6815 AD, Arnhem, The Netherlands;1. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Other Research Platform & Dept. of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, China;2. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ibb University, Ibb, Yemen;1. Department of Oral and Maxillofacial Surgery (Head: Prof. H.J. Park, PhD), Chonnam National University Hospital, Gwangju, Republic of Korea;2. Department of Oral and Maxillofacial Surgery (Head: Prof. B.M. Seo, PhD), School of Dentistry, Dental Research Institute, BK 21 Plus, Seoul National University, Seoul, Republic of Korea;1. Assistant Professor, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Thamar University, Thamar, Yemen;2. Clinical Professor, Departments of Oral and Maxillofacial Surgery and Orthodontics, Texas A&M University Baylor College of Dentistry, Baylor University Medical Center, Dallas, TX;3. Associate Professor, Department of Oral and Maxillofacial Surgery, University of Texas Health Science Center at San Antonio, San Antonio, TX;4. Professor and Chairman Emeritus, Department of Oral and Maxillofacial Surgery, School of Dentistry, Virginia Commonwealth University, Richmond, VA;6. Professor and Chair, Department of Oral and Maxillofacial Surgery, University of Texas Health Science Center at San Antonio, San Antonio, TX |
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| Abstract: | This study aimed to investigate the effects of bimaxillary advancement orthognathic surgery on the condylar remodeling of the temporomandibular joint (TMJ) using voxel-based regional superimposition of cone-beam computed tomography (CBCT).In this retrospective study, the sample comprised 56 condyles from 28 healthy patients (aged from 16 to 50 years) with mandibular retrognathism treated with bimaxillary advancement. CBCT scans were taken preoperatively and at 14.3 ± 4.2 months postoperatively. The scans at the two time points were superimposed using regional voxel-based registration to assess condylar changes in the follow-up period. The linear alterations were measured in six different areas of each condyle to determine the pattern of condylar remodeling.Although no significant correlation was observed between changes in condylar surfaces, bone resorption occurred predominantly in the posterior and superior regions, while bone formation was predominantly on the anterior surface. Medial and lateral surfaces presented fewer bone changes. The overall bone changes were smaller than 1 mm bilaterally in 21 patients (75%) and, considering each condyle individually, were smaller than 1 mm in 48 condyles (85.7%).The results suggested that mild condylar remodeling in healthy patients is a common finding after orthognathic surgery. Future studies may clarify the mechanisms involved in the remodeling and help to understand the reasons for the remodeling pattern. |
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| Keywords: | cone-beam CT 3D image registration CBCT superimposition orthognathic surgery |
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