tailieunhanh - báo cáo khoa học: " Three lateral osteotomy designs for bilateral sagittal split osteotomy: biomechanical evaluation with three-dimensional finite element analysis"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Three lateral osteotomy designs for bilateral sagittal split osteotomy: biomechanical evaluation with three-dimensional finite element analysis | Takahashi et al. Head Face Medicine 2010 6 4 http content 6 1 4 HEAD FACE MEDICINE RESEARCH Open Access Three lateral osteotomy designs for bilateral sagittal split osteotomy biomechanical evaluation with three-dimensional finite element analysis 1 2 1 2 2 1 Hiromasa Takahashi Shigeaki Moriyama Haruhiko Furuta Hisao Matsunaga Yuki Sakamoto Toshihiro Kikuta Abstract Background The location of the lateral osteotomy cut during bilateral sagittal split osteotomy BSSO varies according to the surgeon s preference and no consensus has been reached regarding the ideal location from the perspective of biomechanics. The purpose of this study was to evaluate the mechanical behavior of the mandible and screw-miniplate system among three lateral osteotomy designs for BSSO by using three-dimensional 3-D finite element analysis FEA . Methods The Trauner-Obwegeser TO Obwegeser Ob and Obwegeser-Dal Pont OD methods were used for BSSO. In all the FEA simulations the distal segments were advanced by 5 mm. Each model was fixed by using miniplates. These were applied at four different locations including along Champy s lines to give 12 different FEA miniplate fixation methods. We examined these models under two different loads. Results The magnitudes of tooth displacement the maximum bone stress in the vicinity of the screws and the maximum stress on the screw-miniplate system were less in the OD method than in the Ob and TO methods at all the miniplate locations. In addition Champy s lines models were less than those at the other miniplate locations. Conclusions The OD method allows greater mechanical stability of the mandible than the other two techniques. Further miniplates placed along Champy s lines provide greater mechanical advantage than those placed at other locations. Background Bilateral sagittal split osteotomy BSSO is the most common orthognathic surgical procedure 1 . It was first described by Trauner and Obwegeser in 1957 2 . Since then several .