摘要
目的 基于两种不同材料赋值方法对3种截骨线设计方案进行正中咬合的术前模拟,评估模型的生物力学特性,探讨不同下颌骨类型更适合的截骨线设计方案。方法 选取三类下颌骨,获取CT图像进行三维重建,分别采用皮-松质骨赋值法和灰度赋值法完成材料赋值,按照3种截骨线设计方案模拟截骨,最后进行有限元分析。结果 在下颌骨所有模拟结果中,最大应力为81.10 MPa,最大应变为0.035 52,最大位移为432.4μm。皮-松质骨赋值法得到的应力分布范围比灰度赋值法大,但最大应力、应变和位移普遍较低。对于外翻型和普通型下颌骨,方案1在两种材料赋值方法下都显示出较低的最大应力、应变和位移,但内收型没有找到明显合适的方案。结论 外翻型和普通型下颌骨更适合采用方案1的截骨线设计方案。对于内收型,可能需要考虑其他下颌角截骨整形手术方式以保证更好的生物力学特性。无论是选择截骨线设计方案还是建模材料赋值方式,都需要根据具体的分析目的和资源条件综合考虑,从而做出最终决策。
Objective To conduct preoperative simulations of three different osteotomy line design schemes under centric occlusion based on two distinct material assignment methods,evaluate biomechanical properties of the models,and explore which osteotomy line design schemes are more suitable for different types of mandibles.Methods Three types of mandibles were selected,and CT images were obtained for three-dimensional(3D)reconstruction.Material assignment was completed using the cortical/cancellous bone assignment method and the gray value assignment method.Osteotomy was simulated according to the three osteotomy line design schemes,followed by finite element analysis.Results In all simulation results of the mandibles,the maximum stress was 81.10 MPa,the maximum strain was 0.03552,and the maximum displacement was 432.4μm.The stress distributions obtained by the cortical/cancellous bone assignment method showed a larger stress distribution range than that that by the gray value assignment methods,but the maximum stress,strain,and displacement were generally lower.For the outflare type and common type mandibles,Scheme 1 showed lower maximum stress,strain,and displacement under both material assignment methods,but no clearly suitable scheme was found for the retracted type.Conclusions The outflare type and common type mandibles are more suitable for adopting the osteotomy line design scheme of Scheme 1.For the retracted type,other mandibular angle osteotomy plastic surgery methods may be considered to ensure better biomechanical characteristics.Whether choosing the osteotomy line design scheme or the modeling material assignment method,it is necessary to make the final decision based on the specific analysis objective and resource conditions.
作者
陈曼
程云章
钱玉
张艺驰
林力
张天逸
柴岗
CHEN Man;CHENG Yunzhang;QIAN Yu;ZHANG Yichi;LIN Li;ZHANG Tianyi;CHAI Gang(School of Health Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Engineering Research Center of Interventional Medical Device,Shanghai 200093,China;Department of Plastic and Reconstructive Surgery,Shanghai Ninth People’s Hospital,Shanghai Jiao Tong University School of Medicine,Shanghai 200011,China)
出处
《医用生物力学》
北大核心
2025年第4期878-885,共8页
Journal of Medical Biomechanics
基金
国家自然科学基金项目(82372548)。
关键词
下颌骨
正中咬合
皮-松质骨赋值
灰度赋值
截骨线
有限元分析
mandible
centric occlusion
cortical/cancellous bone assignment
gray value assignment
osteotomy line
finite element analysis
