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Browsing Pubmed by Subject "3D finite element analysis"

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    Citation Count: 18
    Comparison of biomechanical behaviour of maxilla following Le Fort 1 osteotomy with 2-versus 4-plate fixation using 3D-FEA Part 2: Impaction surgery
    (Churchill Livingstone, 2009) Atac, M. S.; Erkmen, E.; Yucel, E.; Kurt, A.
    The aim of the second part of this Study was to evaluate the mechanical behaviour of 2- versus 4-plate fixation and bony structures after Le Fort I impaction surgeries using three-dimensional finite element analysis (3D-FEA). Two 3D-FEA models were created to fixate the impacted maxilla at the Le Fort I level as 2-plate fixation at the piriform rims (IMP-2 model) and 4-plate fixation at the zygomatic buttresses and piriform rims (IMP-4 model). The IMP-2 model contained 225 664 elements and 48 754 nodes and the IMP-4 model consisted of 245 929 elements and 53 670 nodes. The stresses in each maxillary model were computed. The models were loaded on one side, at the molar-premolar region, in vertical, horizontal and oblique directions to reflect the chewing process. It was concluded that the use of 4-plate fixation following Le Fort I advancement Surgery provides fewer stress fields on the maxillary bones and fixation materials than 2-plate fixation from a mechanical point of view.
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    Article
    Citation Count: 18
    Comparison of biomechanical behaviour of maxilla following Le Fort I osteotomy with 2-versus 4-plate fixation using 3D-FEA Part 3: Inferior and anterior repositioning surgery
    (Churchill Livingstone, 2009) Erkmen, E.; Atac, M. S.; Yucel, E.; Kurt, A.
    Having studied the effect of maxillary advancement and maxillary impaction in parts 1 and 2 of this research, the purpose of this study was to investigate the biomechanical behavior of different fixation models in inferiorly and anteriorly repositioned maxilla following Le Fort I osteotomy. Two separate three-dimensional finite element models, simulating the inferiorly advanced maxilla at Le Fort 1 level, were used to compare 2- and 4-plate fixation. Model INF-2 resulted in 247 897 elements and 53 247 nodes and INF-4 consisted of 273 130 elements and 59 917 nodes. The stresses occurring in and around the bone and plate-screw complex were computed. The highest Von Mises stresses on the plates and maximum principal stresses on the bones were found in INF-2, especially under horizontal and oblique loads, when compared with INF-4. The present biomechanical study shows that the traditionally used 4-plate fixation technique, following Le Fort I inferior and anterior repositioning surgery, Without bone grafting, provides fewer stress fields on the maxillary bones and fixation materials.
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    Article
    Citation Count: 30
    Comparison of biomechanical behaviour of maxilla following Le Fort I osteotomy with 2-versus 4-plate fixation using 3D-FEA. Part 1: Advancement surgery
    (Churchill Livingstone, 2008) Atac, M. S.; Erkmen, E.; Yucel, E.; Kurt, A.
    The study aimed to calculate the location and intensity of the maximum stress fields on the fixation plates and surrounding maxilla following Le Fort I osteotomies after advancement procedures using three-dimensional finite element analysis. The models were generated using skull CT scan data. Le Fort I osteotomy Simulations were made and two separate impacted maxillary models were designed. The ADV-2 model has 2 plate fixations bilaterally at the piriform rims, the ADV-4 model has 4 plate fixations at the zygomatic buttresses and piriform rims. The stress fields on bone, plate and screws were computed for each model. Posterior occlusal loads were simulated on one side in the molar-premolar region, in all three directions, reflecting the chewing forces. The increased locations of highest Von Mises stresses on the plates and highest maximum principle stresses on the bones were determined in ADV-2 models especially Under horizontal and oblique loads when compared with ADV-4 models. Evaluation of the highest Von Mises Stress Values and maximum principal stress revealed that oblique load in the ADV-2 model received the highest values. 4-plate fixation following Le Fort I advancement Surgery exerts less stress on the maxillary bones and fixation materials than 2-plate fixation.