The quantitative correlation between condylar resorption and skeletal relapse following mandibular advancement in skeletal class II malocclusion patients |
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| Affiliation: | 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 Plastic and Aesthetic, Reconstructive and Hand Surgery at AGAPLESION Markus Hospital, Frankfurt am Main, Germany;2. Department for Oral, Cranio-Maxillofacial and Facial Plastic Surgery, Medical Center of the Goethe University Frankfurt, Frankfurt, Germany;3. AGAPLESION Evangelical Hospital Central State of Hesse, Department of Plastic, Aesthetic, Reconstructive and Hand Surgery, Paul-Zipp-Straße 171, 35398, Giessen, Germany;1. Graduate Dental School, Chonnam National University, Gwangju, Republic of Korea;2. Department of Oral and Maxillofacial Surgery, School of Dentistry, Dental Science Research Institute, Chonnam National University, Gwangju, Republic of Korea;3. Department of Oral and Maxillofacial Surgery, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, Republic of Korea;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. Center of Craniofacial Orthodontics, Department of Oral and Cranio-Maxillofacial Surgery, Shanghai Ninth People''s Hospital, Shanghai Jiaotong University School of Medicine, Shanghai Key Laboratory of Stomatology, China;2. Department of Orthodontics, Ninth People''s Hospital, Shanghai Jiaotong University School of Medicine, Shanghai Key Laboratory of Stomatology, China;3. Shanghai Meitian Dental Clinic, China;1. Resident Doctor, Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Stomatology and Jiangsu Key Laboratory of Oral Disease, Nanjing Medical University, Jiangsu, China;2. Resident Doctor, Department of Oral and Maxillofacial Surgery, The First People''s Hospital of Changzhou and The Third Affiliated Hospital of Soochow University, Jiangsu, China;3. Associate Professor, Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, Jiangsu, China;4. Professor, Department of Orthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Jiangsu, China;6. Professor, Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, Jiangsu, China;5. Associate Professor, Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, Jiangsu, China |
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| Abstract: | ObjectiveThe purpose of this study was to analyze the quantitative correlation between condylar resorption and skeletal relapse after mandibular advancement surgery.Materials and methodsSkeletal Class II malocclusion patients who underwent bilateral sagittal split ramus osteotomy (BSSRO) were included. Three-dimensional reconstruction was based on one-week and one-year post-operative CT scans. The condylar morphological alterations were assessed by anterior-posterior, medial-lateral diameter and condylar height. The mandibular relapse was calculated by the positional changes of pogonion, menton, gonions, gnathion and mental foramens. All data were measured by MIMICS and analyzed by SPSS software; significance was set at p<0.05.Results31 patients (62 condyles) were enrolled into this study. 28 of 62 condyles showed resorption beyond 1 mm on condylar height and 15 were beyond 2 mm. Positional changes of chin, mental foramens and gonion were respectively 1.57 ± 2.36 mm, 1.31 ± 1.23 mm and 1.42 ± 1.02 mm. 21 of 31 patients experienced mandibular relapse less than 1 mm but additional 4 patients showing relapse more than 2 mm. Correlation with moderate intensity could be observed between condylar height alteration and post-operative mandibular displacement more than 1 mm (p = 0.035).ConclusionThe resorption degree of condylar height can be regarded as a useful parameter for evaluating post-operative skeletal relapse. |
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| Keywords: | BSSRO Condylar resorption 3D remodeling Mandibular retrusion |
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