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KMID : 0355620120380050271
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Journal of Korean Association of Oral and Maxillofacial Surgeons
2012 Volume.38 No. 5 p.271 ~ p.275
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Three-dimensional finite element analysis of the stress distribution and displacement in different fixation methods of bilateral sagittal split ramus osteotomy
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Yun Kyoung-In
Lee Jong-Min
Park Yoon-Hee
Park Myung-Kyun
Cho Young-Gyu
Park Je-Uk
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Abstract
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Objectives: This study evaluated a range of fixation methods to determine which is best for the postoperative stabilization of a mandibular osteotomy using three-dimensional finite element analysis of the stress distribution on the plate, screw and surrounding bone and displacement of the lower
incisors.
Materials and Methods: The model was generated using the synthetic skull scan data, and the surface model was changed to a solid model using software. Bilateral sagittal split ramus osteotomy was performed using the program, and 8 different types of fixation methods were evaluated. A vertical load of 10 N was applied to the occlusal surface of the first molar.
Results: In the case of bicortical screws, von-Mises stress on the screws and screw hole and deflection of the lower central incisor were minimal in type 2 (inverted L pattern with 3 bicortical repositioning screws). In the case of plates, von-Mises stress was minimal in type 8 (fixation 5 mm above the inferior border of the mandible with 1 metal plate and 4 monocortical screws), and deflection of the lower central incisor was minimal in types 6 (fixation 5 mm below the superior border of the mandible with 1 metal plate and 4 monocortical screws) and 7 (fixation 12 mm below the superior border of the mandible with 1 metal plate and 4 monocortical screws).
Conclusion: Types 2 and 6 fixation methods provide better stability than the others.
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KEYWORD
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3D finite element analysis, Fixation techniques, Sagittal split ramus osteotomy
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