Relationship between occlusal force and condylar morphology in class II and III after bi-maxillary osteotomy
| Autor: | Asami Hotta, Yuki Saito, Tatsuya Tsunoda, Kunio Yoshizawa, Akinori Moroi, Ryota Hiraide, Koichiro Ueki, Takamitsu Tsutsui, Akihiro Takayama, Nana Baba, Momoko Sato |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Adult
Adolescent Cephalometry Osteotomy Sagittal Split Ramus Computed tomography Class iii Malocclusion Angle Class II Le Fort I osteotomy Condyle Bite Force 03 medical and health sciences 0302 clinical medicine stomatognathic system Sagittal Split Ramus Osteotomy Female patient Humans Osteotomy Le Fort Medicine Maxillary Osteotomy Retrospective Studies Orthodontics Temporomandibular Joint medicine.diagnostic_test business.industry Mandibular Condyle 030206 dentistry Middle Aged Magnetic Resonance Imaging Malocclusion Angle Class III Treatment Outcome Otorhinolaryngology 030220 oncology & carcinogenesis Female Surgery Ramus height Oral Surgery Tomography X-Ray Computed business |
| Zdroj: | Journal of Cranio-Maxillofacial Surgery. 46:2103-2107 |
| ISSN: | 1010-5182 |
| Popis: | Purpose The purpose of this study was to examine the relationship between occlusal force and condylar morphology in class II and III after sagittal split ramus osteotomy (SSRO) with Le Fort I osteotomy. Materials and methods The subjects were 42 female patients who underwent bi-maxillary surgery, and were divided into 2 groups (21 class II and 21 class III cases). They were selected randomly from among patients that underwent surgery from 2012 to 2017. Condylar height, ramus height, ramus inclination and condylar square were assessed by computed tomography (CT), preoperatively and 1 year postoperatively. Occlusal contact area and occlusal force were measured pre- and 1, 3, 6 and 12 months post-operative. Results Condylar height and ramus height of the class II advancement cases decrease more significantly than those of class III. There were no significant differences in time-course changes of occlusal force and area between the class II and III. In the class II cases, occlusal force at 1 and 3 months was significantly lower than the preoperative value (P = 0.0009, P = 0.0002). On the other hand, in class III, occlusal force at 1, 3 and 6 months (P = 0.0038, P = 0.0031, P = 0.0283) was significantly lower than the preoperative value. Conclusion This study suggested that occlusal force of the class II advancement cases reached the pre-operative level earlier than that of the class III setback cases, even though condylar height decreased after surgery in the class II cases. However, a correlation between occlusal force change and condylar height reduction after surgery could not be found. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect