Evaluation of condylar surface CT values related to condylar height reduction after orthognathic surgery |
| |
| Affiliation: | 1. Department of Oral and Maxillofacial Surgery, Division of Medicine, Interdisciplinary Graduate School, University of Yamanashi, 1110 Shimokato, Chuo Yamanashi, 409-3893, Japan;1. Specialist in Oral and Maxillofacial Surgery, Department of Oral and Maxillofacial Surgery, University of Erlangen-Nuremberg, Glückstraße 11, 91056, Erlangen, Germany;2. Head of Nephropathology, University of Erlangen-Nuremberg, Glückstraße 11, 91056, Erlangen, Germany;3. Resident, Department of Oral and Maxillofacial Surgery, University of Erlangen-Nuremberg, Glückstraße 11, 91056, Erlangen, Germany;4. Doctoral Students, Department of Oral and Maxillofacial Surgery, University of Erlangen-Nuremberg, Glückstraße 11, 91056, Erlangen, Germany;5. Department of Oral and Maxillofacial Surgery, University of Erlangen-Nuremberg, Glückstraße 11, 91056, Erlangen, Germany;6. Former Head of Department of Oral and Maxillofacial Surgery, University of Erlangen-Nuremberg, Glückstraße 11, 91056, Erlangen, Germany;7. Head of Department of Oral and Maxillofacial Surgery, University of Erlangen-Nuremberg, Glückstraße 11, 91056, Erlangen, Germany;8. Specialist in Pathology, University of Erlangen-Nuremberg, Glückstraße 11, 91056, Erlangen, Germany;1. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Recep Tayyip Erdogan University, Central Rize, Rize, Turkey;2. Department of Maxillofacial Surgery, Faculty of Dentistry, Karadeniz Technical University, Akcaabat, Trabzon, Turkey;3. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, University of Health Sciences, Uskudar, Istanbul, Turkey;4. Department of Radiology, Faculty of Medicine, Karadeniz Technical University, Akcaabat, Trabzon, Turkey;1. Department of Oral and Maxillofacial Surgery, School of Dentistry, Seoul National University, Republic of Korea;2. Department of Orthodontics, School of Dentistry, Dental Science Research Institute, Chonnam National University, Republic of Korea;3. Dental Research Institute, Seoul National University, Republic of Korea;4. HSJ Dental Clinic for Oral and Maxillofacial Surgery, 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) |
| |
| Abstract: | This study was performed to evaluate the relationship between condylar height reduction and changes in condylar surface computed tomography (CT) values in jaw deformity patients following orthognathic surgery.Mandibular advancement by sagittal split ramus osteotomy (SSRO) with Le Fort I osteotomy was performed in class II patients, and mandibular setback by SSRO with Le Fort I osteotomy was performed in class III patients. The maximum CT values (pixel values) at five points on the condylar surface and the condylar height, ramus height, condylar square, ramus angle, and gonial angle in the sagittal plane were measured preoperatively and 1 year postoperatively. Disc position was classified as anterior disc displacement (ADD) or other types by using magnetic resonance imaging (MRI).Ninety-two condyles of 46 female patients were prepared for this study. Their temporomandibular joints (TMJs) were divided into two groups based on class (46 joints in class II and 46 joints in class III) and two groups based on the findings (25 joints with ADD and 67 joints with other findings). ADD with and without reduction was observed in two joints in the class III group and in 23 joints in the class II group. The distribution of ADD incidence had not changed 1 year after surgery. Condylar height decreased 1 year after surgery in both class II patients (mandibular advancement) (p < 0.0001) and class III patients (mandibular setback) (p = 0.0306). Similarly, condylar height decreased 1 year after surgery both in patients who showed ADD (p = 0.0087) and those with other types (p = 0.0023). Significant postoperative increases at all angle sites on the condylar surface were found in the class II (p < 0.05) and ADD (p < 0.05) groups.This study showed that an enhanced condylar surface CT value might be one sign of condylar height reduction related to sequential condylar resorption, in combination with ADD. |
| |
| Keywords: | Sagittal split ramus osteotomy Computed tomography (CT) Disc position Condyle |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
