Finite Element Evaluation of Stable Fixation in Combined Mandibular Fractures
| Autor: | Luis Augusto Passeri, Daniel Takanori Kemmoku, Thalita Regina Vieira e Oliveira, Pedro Yoshito Noritomi, Jorge Vicente Lopes da Silva |
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| Rok vydání: | 2017 |
| Předmět: |
Symphysis
Bone Screws Finite Element Analysis Dentistry Condyle Fracture Fixation Internal 03 medical and health sciences Fixation (surgical) 0302 clinical medicine stomatognathic system Mandibular Fractures Bone plate Fracture fixation medicine Humans Computer Simulation Stress concentration business.industry 030206 dentistry musculoskeletal system Finite element method Stable fixation Biomechanical Phenomena medicine.anatomical_structure Otorhinolaryngology 030220 oncology & carcinogenesis Surgery Stress Mechanical Oral Surgery business Bone Plates |
| Zdroj: | Journal of Oral and Maxillofacial Surgery. 75:2399-2410 |
| ISSN: | 0278-2391 |
| DOI: | 10.1016/j.joms.2017.06.021 |
| Popis: | Purpose The fixation of combined mandibular fractures, especially symphyseal-condylar fractures, although occurring commonly and having a higher complication rate in the clinic, is rarely investigated regarding predictable therapeutic approaches. Thus this study's aim was to assess different forms of condylar fixation when combined with symphyseal fracture fixation. Materials and Methods Using finite element models, we analyzed the stress distribution that occurs when a condylar fracture is fixed with 1 miniplate, 2 miniplates, or a trapezoidal condylar miniplate and when a symphyseal fracture is fixed with 2 parallel plates, 2 perpendicular plates, or 2 lag screws. The null hypothesis was that there would be no differences among the different fixation techniques. Results The results showed a stress concentration in the anterior region of the condyle, close to the sigmoid notch. Moreover, adequate fixation in the symphysis could result in less tension at the condylar region. Therefore, when the symphysis was fixed with a lag-screw technique, condylar fixation was less required, showing a more adequate stress distribution when the condyle was fixed with 1 or 2 plates. Conversely, when the symphyseal fixation was less effective, by use of perpendicular plates, there was a change in the stress distribution at the condylar region, altering fixation behavior and resulting in more tension and displacement in the condyle, especially when a trapezoidal plate was used. Conclusions A lag screw and parallel double plates appear to be suitable for symphyseal fixation, whereas 2 straightly positioned plates and a trapezoidal plate are suitable for condylar fixation. However, the combination of perpendicular plates in symphyseal fixation and a trapezoidal plate in condylar fixation showed an altered stress distribution. |
| Databáze: | OpenAIRE |
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