全冠修复体的仿生优化设计与有限元分析  

Finite element analysis and biomimetic optimal design of full-crown restoration

作　　者：王震 丰景 陈江海 赵克[2] Wang Zhen;Feng Jing;Chen Jianghai;Zhao Ke(Department of Stomatology,Xinyang Central Hospital,Xinyang 464000,China;Department of Prosthodontics,Hospital of Stomatology,Sun Yat-sen University,Guangzhou 510030,China)

机构地区：[1]信阳市中心医院口腔科,信阳464000 [2]中山大学附属口腔医院修复科,广州510030

出　　处：《中华医学杂志》2022年第33期2624-2629,共6页National Medical Journal of China

摘　　要：目的通过仿生优化设计及有限元分析提高全冠修复体的力学性能并阐明其最佳弹性模量分布。方法构建7种具有不同类型全冠修复体的下颌第一前磨牙有限元模型,分别为氧化锆全冠(A模型)、二硅酸锂玻璃陶瓷全冠(B模型)、氧化锆-饰瓷全冠(C模型)、二硅酸锂玻璃陶瓷-饰瓷全冠(D模型)、仿人牙釉质8层结构全冠(E模型)、经遗传算法(GA)优化使全冠拉应力峰值最小的8层结构全冠(F模型)及经GA优化使水门汀黏接层剪切力峰值最小的8层结构全冠(G模型)。在全冠咬合面平行牙长轴模拟施加600 N载荷,计算并分析各模型的最大主应力,以提高全冠修复体的力学性能并阐明其最佳弹性模量分布。结果冠部拉应力主要集中在颈缘及组织面。其中E模型表现出相对较低的拉伸应力峰值17.72 MPa,其在F模型降至16.25 MPa,在G模型为25.79 MPa;水门汀黏接层的剪切应力主要集中在靠近肩台的轴壁侧及肩台外侧边缘。其中E模型剪切应力峰值为11.81 MPa,F模型为11.79 MPa,在G模型降至6.14 MPa。结论经GA优化以降低水门汀剪切力峰值的弹性模量分布可更好地改善全冠修复体的力学性能。Objective To improve the mechanical properties of full-crown restorations and illuminate the optimal elastic modulus distribution through bionic optimization design and finite element analysis(FEA).Methods Seven 3D models of mandibular first premolars with different full-crown restorations were constructed:(A)zirconia monolithic crown,(B)lithium disilicate monolithic crown,(C)zirconia bilayer crown,(D)lithium disilicate bilayer crown,(E)8-layer crown referred to the elastic modulus distribution of human enamel,(F)and(G)were 8-layer crowns with elastic modulus distribution calculated by a genetic algorithm(GA)to minimize the tensile stresses in the crown and the shear stresses at the cementing line,respectively.Results in the crowns and cementing lines were obtained with maximum principal stress after applying a static load of 600 N.Results The principal tensile stresses in the full-crown restorations were mainly concentrated in the cervical margins and the crown-cementing interface.Among them,G exhibited a peak tensile stress of 25.79 MPa,which decreased to 17.72 MPa in E and 16.25 MPa in F;The principal shear stresses in cementing lines were concentrated along the margins and low on the axial wall.The peak shear stress of the cementing line of E and F was 11.81 MPa and 11.79 MPa,respectively.While G was found to has the lowest peak shear stress of 6.14 MPa.Conclusion The elastic modulus distribution optimized by GA to reduce the peak shear stress of the cementing line can better improve the mechanical properties of the full-crown restoration.

关 键 词：牙冠 全冠修复体 有限元分析 遗传算法 弹性模量 应力分布 

分 类 号：R783.1[医药卫生—口腔医学]