循环温度与咬合力作用下下颌中切牙瓷贴面三维有限元应力分析  

Three-dimensional finite element analysis of ceramic veneer of mandibular central incisor under the action of cyclic temperature and occlusal force

作　　者：高小杰 张宗美 GAO Xiao-jie;ZHANG Zong-mei(Department of Stomatology,Dongying First People’s Hospital,Dongying 257091,China;Department of Ophthalmology,Dongying First People’s Hospital,Dongying 257091,China)

机构地区：[1]东营市人民医院口腔科,东营257091 [2]东营市人民医院眼科,东营257091

出　　处：《口腔颌面修复学杂志》2025年第1期23-28,共6页Chinese Journal of Prosthodontics

摘　　要：目的:旨在采用三维有限元法研究下颌中切牙瓷贴面在循环温度与咬合力作用下应力分布的规律。方法:采用CBCT扫描下颌中切牙,建立下颌中切牙瓷贴面三维有限元模型,分别在循环温度、循环咬合力及循环温度叠加循环咬合力作用下,应用有限元分析软件分析下颌中切牙瓷贴面Von Mises应力、最大主应力(正值为拉应力,负值为压应力)的分布情况。结果:瓷贴面在低温循环作用下Von Mises应力值均大于高温循环作用下。在低温循环下,瓷贴面抛光面中央为拉应力集中区,最大主应力峰值为29.33 MPa。在高温循环下,瓷贴面组织面中央大部分区域为拉应力集中区,最大主应力峰值为9.25 MPa。在循环咬合力作用下,斜向循环加载时Von Mises应力峰值为40.22 MPa,正向循环加载Von Mises应力峰值为27.29 MPa。斜向循环加载时,瓷贴面的颈缘为拉应力集中区,最大主应力峰值为28.70 MPa。正向循环加载时,瓷贴面的切端加载区周围为拉应力集中区,最大主应力较小。在循环温度叠加循环咬合力作用下,瓷贴面在两种载荷叠加作用下的应力值大于单独循环温度与单独咬合力作用下的应力值。结论:单独循环温度、循环咬合力对瓷贴面的安全性影响较小,循环温度与循环咬合力有一定的协同作用。Objective:This study aimed to analyze the stress distribution of ceramic veneer on the mandibular central incisor under the action of cyclic temperature and occlusal force using the three-dimensional finite element method.Methods:A CBCT scan of the mandibular central incisor was performed to establish a three-dimensional finite element model of the ceramic veneer on the mandibular central incisor.Finite element analysis software was used to analyze the distribution of Von Mises stress and maximum principal stress(positive value was tensile stress,negative value was compressive stress)under cyclic temperature,cyclic occlusal force and cyclic temperature superimposed cyclic occlusal force.Results:The Von Mises stress value of ceramic veneer under low-temperature cyclic was higher than those under high-temperature cyclic.Under low-temperature cycling,the central area of the polished surface of the ceramic veneer was identified as the tensile stress concentration zone,with the maximum principal stress peak of 29.33 MPa.Under high-temperature cycling,most of the central area of the ceramic veneer’s surface was the tensile stress concentration zone,with the maximum principal stress peak of 9.25 MPa.Under the influence of cyclic occlusal force,the peak Von Mises stress during oblique cyclic occlusal force was 40.22 MPa,while the peak Von Mises stress during direct cyclic occlusal force was 27.29 MPa.During oblique cyclic occlusal force,the neck edge of the ceramic veneer was identified as the tensile stress concentration zone,with a maximum principal stress peak of 28.70 MPa.During positive cycle occlusal force,the area around the incisal edge of the ceramic veneer was a region of tensile stress concentration,with the maximum tensile stress being relatively small.Under the combined effects of cyclic temperature and cyclic occlusal force,the stress value of the ceramic veneer subjected to both occlusal forces were greater than the stress value resulting from cyclic temperature and cyclic occlusal force acting separatel

关 键 词：瓷贴面 三维有限元 循环温度 循环咬合力 

分 类 号：R783.3[医药卫生—口腔医学]