Biomechanical Effect of Parameters in Different Osteomy Sections of Orthognathic Surgery
| Autor: | Bang-Sia Chen, 陳邦俠 |
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| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 Le Fort I and sagittal split osteotomy have been applied widely in maxilla and mandible respectively, to correct the jaw deformity. The purpose of this study is to investigate biomechanical effect of two jaw osteotomy under food bolus mastication by finite element analysis, ten resection plane and four types of bone plate for mandible and the Le Fort I osteotomy and L-shape bone plate for maxilla. The systemic analysis of the two jaw osteotomy with different resection planes and bone plates could provide reference guide line of clinical application by investigating stress distribution and stability of the bone plates. The model of finite element jaw osteotomy analysis was consisted of maxilla, mandible, disc, teeth, alveolar nerve, miniplate, and miniscrew. Two stages were simulated in this study, first stage was performed in the single mandibular osteotomy to investigate the effect of biomechanics in the ten resection plane combined with four types of bone plate, second stage was examined masticated biomechanical effect of the two jaw by osteotomy. Muscular forces of close mouth and vertical force of 300 N at the incisor and molar as the loading conditions were applied in the single mandible models, muscular forces of close mouth and food bolus at the incisor and molar as the loading conditions were used in the two jaw models. The results showed that equivalent stress in the models of incisor biting force were larger than that of molar biting force, I-shape plate could provide a better biomechanical performance in stability. For two jaw osteotomy analysis, the maximum equivalent stress and displacement in the maxilla was much smaller than mandible, moreover, the models of the CO series of resection planes revealed in tendency of bone contact area increase to reflect stress magnitude decrease. In the stability evaluation, the worse trend in stability was detected in the two jaw osteotomy model under food bolus biting at the incisor region. On the other hand, the index of micro strain in the mandibular condylar head and fossa were not significant difference to reflect bone resorption effect. General conclusions of this FE simulations were that the model of RO1 resection plan combined with X-type plate for two jaw osteotomy was observed in the minimum risk of plate fracture, for viewpoint of stability, the model of GO2 resection plan combined with BOX-type plate for two jaw osteotomy was evidenced the best biomechanical effect |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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