Changes in condylar and joint disc positions after bilateral sagittal split ramus osteotomy for correction of mandibular prognathism |
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| Authors: | B. Fang G.-F. Shen C. Yang Y. Wu Y.-M. Feng L.-X. Mao Y.-H. Xia |
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| Affiliation: | 1. PhD Student, Department of Orthodontics, School of Dentistry, State University of Rio de Janeiro, Rio de Janeiro, Brazil;2. Assistant Professor, Department of Orthodontics, School of Dentistry, University of Michigan, Ann Arbor, MI;3. Professor, Department of Orthodontics, University of North Carolina, School of Dentistry, Chapel Hill, NC;4. Professor, Department of Orthodontics, University of North Carolina, School of Dentistry, Chapel Hill, NC;6. Professor, Department of Oral and Maxillofacial Surgery, University of North Carolina, School of Dentistry, Chapel Hill, NC;5. Assistant Professor, Department of Orthodontics, School of Dentistry, State University of Rio de Janeiro, Rio de Janeiro, Brazil;7. Professor, Department of Orthodontics, School of Dentistry, State University of Rio de Janeiro, Rio de Janeiro, Brazil;11. Professor, Department of Orthodontics, School of Dentistry, State University of Rio de Janeiro, Rio de Janeiro, Brazil;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;1. Department of Oral and Maxillofacial Surgery, Special Dental Care and Orthodontics, Erasmus MC – University Medical Centre Rotterdam, The Netherlands;2. Medical Library, Erasmus MC – University Medical Centre Rotterdam, The Netherlands;1. Classified Specialist, Department of Oral and Maxillofacial Surgery, 11 Corps Dental Unit, Jalandhar Cantt, India;2. Commandant, Military Hospital, Chennai, India;3. Graded Specialist, Department of Orthodontics and Dentofacial Orthopedics, Command Military Dental Centre, Western Command, Chandimandir, India;4. Graded Specialist, Department of Radiodiagnosis and Imaging, 158 Base Hospital, Bengdubi, India;6. Lecturer, Department of Preventive and Social Medicine, Armed Forces Medical College, Pune, India;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;2. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ibb University, Ibb, Yemen |
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| Abstract: | The effect of combined orthodontic and orthognathic treatment was studied retrospectively in 24 patients with skeletal class III malocclusions with mandibular hyperplasia, particularly the effect on temporomandibular joint (TMJ) disc position. The patients underwent preoperative orthodontic treatment, orthognathic surgery, and postoperative orthodontic treatment. The patients were studied clinically, radiographically with lateral cephalometric radiograph and MRI to locate the position of the TMJ disc in relation to the glenoid fossa. One patient had less pain after treatment, one lost abnormal joint clicking sounds after treatment. There were no TMJ symptoms in 20 of the 24 preoperatively and postoperatively. 48 sagittal MRI images showed that the disc length before treatment was 3.040–12.928 (mean 8.289 ± 2.028) and after treatment was 3.699–11.589 (mean 8.097 ± 1.966); results were not significant (p > 0.05). Maximum disc displacement before treatment was 6.090 (mean 1.383), after treatment it was 11.931 (mean 2.193); results were not significant (p > 0.05). The results suggest that combined orthodontic and orthognathic treatment (including bilateral SSRO and rigid internal fixation) can be used safely to correct skeletal class III malocclusion with mandibular hyperplasia without causing additional TMJ symptoms. |
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