摘要
目的 探讨不同嵌体龈壁设计及修复材料对龈壁提升(DME)后嵌体修复的实体模型生物力学特性的影响。方法 采用有限元仿真方法,建立下颌第一磨牙DME后嵌体修复的实体模型,分别模拟不同嵌体龈壁设计和嵌体修复材料在咬合力作用下的生物力学特性。通过分析模型各部分及界面的应力分布,比较不同设计参数对模型和界面应力的影响。结果 牙本质肩台设计可降低牙釉质、牙本质、嵌体及DME层的最大主应力(MPS)峰值,同时降低嵌体-牙齿、嵌体-DME层、DME层-牙齿界面的界面拉应力(ITS)峰值,从而降低模型各部分的碎裂和脱落风险。嵌体材料变化对MPS峰值影响不大;但随着嵌体弹性模量的增加,嵌体-牙齿、嵌体-DME层、DME层-牙齿界面的ITS峰值呈上升趋势。结论 合理设计牙本质肩台及选择低弹性模量的树脂嵌体可降低修复材料的脱落风险。
Objective To investigate the influence of different inlay marginal designs and materials on the biomechanical properties of a dental model after deep margin elevation(DME).Methods A finite element simulation method was used to establish a dental model of a first molar with DME and cemented inlay restoration.Different inlay marginal designs and materials were simulated under biting force.The stress distribution of each part and interface of the model was analyzed,and the influence of different design parameters on the stress of the model and interface was compared.Results The design of the marginal shoulder can reduce the maximum principal stress(MPS)peak value of the enamel,dentin,inlay,and DME layers,and also reduce the interface tensile stress(ITS)peak value of the interfaces between the inlay and tooth,inlay and DME,and DME and tooth,thus reducing the risk for the fracture and detachment of each part of the model.The change in restoration material had little effect on the MPS peak value,but as the elastic modulus of the inlay increased,the ITS peak value of the interfaces between the inlay and tooth,inlay and DME,and DME and tooth was increased.Conclusion The reasonable design of the marginal shoulder and the selection of low-elastic-modulus resin inlay can reduce the risk for the detachment of the restoration material.
作者
曹谅
赵阿莉
王利民
王广慈
王卫国
CAO Liang;ZHAO Ali;WANG Limin;WANG Guangci;WANG Weiguo(Department of Stomatology,Joint Service Support Force 903 Hospital of the Chinese People's Liberation Army,Hangzhou 310013,CHINA)
出处
《江苏医药》
CAS
2024年第9期865-869,F0002,F0003,共7页
Jiangsu Medical Journal
基金
国家自然科学基金青年科学基金项目(81600916)
浙江省医药卫生科技计划项目(2021KY945)。
关键词
龈壁提升
嵌体
龈下缺损
有限元分析
应力分布
Deep margin elevation
Inlay
Subgingival defects
Finite element analysis
Stress distribution
