全瓷界面功能梯度层优化设计、构建与性能研究

发布时间：2018-05-24 22:15

  本文选题：全瓷 + 功能梯度层　； 参考：《上海交通大学》2015年硕士论文

【摘要】：目的：通过建立双层瓷／仿生功能梯度层/粘结剂/牙本质基底的平面及三维曲面有限元模型。模拟加载，对模型进行三维有限元力学分析,探明全瓷修复体界面仿生功能梯度层优化设计办案。同时,应用玻璃渗透技术制作不同预烧结温度的包含仿生功能梯度界面的氧化锆陶瓷试件,研究其渗透界面的微观结构与力学行为的变化,探讨仿生功能梯度界面提高全瓷修复体性能的可靠性和可行性,为进一步临床应用提供实验依据。方法：1.建立双层瓷／仿生功能梯度层/粘结剂／牙本质基底的三维平面有限元模型(核瓷材料设定为氧化锆),不包含仿生功能梯度层的模型,即双层瓷／粘结剂／牙本质基底的三维平面有限元模型作为对照组,对模型进行垂直加载,并采用ANSYS软件中的一阶方法对仿生功能梯度层弹性模量的变化进行优化计算分析。2.选取完整无磨损的离体成人右上颌第一磨牙作为标本,经Micro-CT扫描获取图像,经Mimics10.0软件进行三维重建。建立双层瓷／仿生功能梯度层／粘结剂／牙本质基底的三维曲面有限元模型(核瓷材料设定为氧化锆)。不包含功能梯度层的模型,即双层瓷／粘结剂／牙本质基底的三维曲面有限元模型作为对照组。对模型施加垂直和斜向加载,采用ANSYS软件中的一阶方法对仿生功能梯度层弹性模量的变化进行优化计算分析。3.制备直径为12mm,厚0.5mm氧化锆圆盘状试件,将试件按照预烧结温度分为900℃、1000℃、1100℃三细,调配玻璃浆料渗透于试件表而,再进行终烧结电镜下检测试件横截面,观察梯度层的微观结构,并对试件作纳米压痕试验、最大断裂压力测试及循环疲劳实验,检测仿生功能梯度氧化锆试件的弹性模量、抗压强度、抗疲劳强度并进行表面裂纹的初步分析。结果：1.建立了双层瓷／功能梯度层/粘结剂／牙本质基底的三维平面有限元模型。垂直加载情况下,功能梯度层中最大主应力为23.0186MPa。应力分布均匀且平稳过渡；而对照组,在核瓷底部出现了应力集中,最大主应力值为100.25MPa,并且得到了实验组功能梯度层内弹性模量梯度变化的优化曲线。2.建立了双层瓷／功能梯度层／粘结剂／牙本质基底的三维曲面有限元模型。实验组在垂直加载时功能梯度层中最大主应力为76.70MPa,斜向加载时功能梯度层中最大主应力为31.80MPa,应力分布均匀；而对照组,在核瓷底部出现了应力集中,垂直加载和斜向加载时最大主应力值分别为121.90MPa和63.82MPa,实验组的最大主应力在垂直加载和斜向加载时分别下降了37.07%和50.18%。本实验还分别得到了实验组功能梯度层内弹性模量梯度变化的优化曲线。3.通过玻璃渗透法制备不同预烧结温度(900℃,1000℃,1100℃)的功能梯度氧化锆陶瓷试件。电镜显示氧化锆试件横截面的背散射电子图像(BSE)并表明形成了约150-200μm的梯度结构层。纳米压痕实验结果显示功能梯度层从表面向内部弹性模量逐渐增高,在氧化锆表层形成了一个有效的弹性模量梯度。对不同预烧结温度的试件进行最大负载力学实验结果显示仿生功能梯度界面的存在提高了试件的抗压强度；而在循环疲劳实验的结果提示仿生功能梯度氧化锆陶瓷较对照组相比可承受更多次的循环加载,实验后对试件表面观察也显示仿生功能梯度氧化锆形成的裂纹较少且规则。结论：1.仿生界面功能梯度层能有效降低全瓷修复体核瓷底部的应力集中,其内部弹性模量的梯度变化存在优化方式。2.利用玻璃渗透技术可以在氧化锆核瓷内形成仿生功能梯度结构,仿生功能梯度结构可显著提高氧化锆陶瓷的抗压及增韧能力,且玻璃渗透过程中预烧结温度对陶瓷力学性能的提高程度有一定影响。
[Abstract]:Objective: by establishing a plane and three-dimensional surface finite element model of double porcelain / biomimetic functionally graded layer / binder / dentine base, simulated loading, three-dimensional finite element mechanics analysis of the model, and the optimization design of the bionic functionally graded layer of all porcelain prosthesis interface. At the same time, different pre sintering temperatures were made by glass infiltration technology. A zirconia ceramic specimen containing a biomimetic functionally gradient interface was used to study the microstructure and mechanical behavior of the interface, and to explore the reliability and feasibility of improving the performance of all ceramic restorations by the biomimetic functionally gradient interface, and to provide experimental basis for further clinical application. Method: 1. the double layer porcelain / biomimetic functionally gradient layer was established. The three-dimensional plane finite element model of the adhesive / dentine substrate (the nuclear porcelain is set as zirconia), and does not contain the model of the biomimetic functionally gradient layer, that is the three-dimensional plane finite element model of the double porcelain / adhesive / dentine base as the control group. The model is loaded vertically, and the bionic function is adopted by the first order method in the ANSYS software. The change of the elastic modulus of the gradient layer is optimized and analyzed by.2., the intact right maxillary first molar of the adult adult is selected as the specimen, the image is obtained by Micro-CT scanning, and the three-dimensional reconstruction is carried out by the Mimics10.0 software. The three-dimensional surface finite element model of the double porcelain / bionic functionally gradient layer / binder / dentine base is established. The ceramic material is set as zirconium oxide. The model which does not contain the functionally gradient layer, that is the three-dimensional surface finite element model of the double porcelain / adhesive / dentine base is used as the control group. The vertical and oblique loading of the model are applied to the model. The first order method of the ANSYS software is used to optimize the.3. system for the change of the elastic modulus of the biomimetic functionally graded layer. A disc specimen with a diameter of 12mm and thick 0.5mm zirconia was prepared. The specimen was divided into 900 degrees centigrade, 1000 C, 1100 C three fines at the pre sintering temperature, and the glass slurry was mixed with the specimen table, then the cross section of the specimen was detected under the final sintering electron microscope, and the microstructure of the gradient layer was observed, and the nano indentation test, the maximum fracture pressure test and the evidence-based process were made to the specimen. The elastic modulus, the compressive strength, the fatigue strength and the surface crack of the biomimetic functionally graded zirconia specimen were measured by the cyclic fatigue test. Results: 1. the three-dimensional plane finite element model of the double ceramic / functional gradient layer / binder / dentine base was established. The maximum principal stress in the functionally graded layer under the vertical loading condition. The stress distribution of 23.0186MPa. is uniform and smooth, while in the control group, the stress concentration in the bottom of the nuclear porcelain has a stress concentration, the maximum principal stress is 100.25MPa, and the optimization curve of the elastic modulus gradient in the functional gradient layer of the experimental group is obtained. The three-dimensional surface of the double ceramic / functional gradient layer / binder / dentine base is established by.2.. The maximum principal stress in the functional gradient layer of the experimental group is 76.70MPa. The maximum principal stress in the functionally graded layer is 31.80MPa and the stress distribution is uniform when the vertical loading is loaded vertically. While the control group has a stress concentration at the bottom of the nuclear porcelain, the maximum principal stress values of the vertical loading and the oblique loading are 121.90MPa and 63.82MPa, respectively. The maximum principal stress of the test group decreased by 37.07% and 50.18%. respectively at the vertical loading and oblique loading. The optimized curve.3. of the elastic modulus gradient in the functional gradient layer of the experimental group was also obtained respectively. The functional gradient zirconium oxide ceramic specimens with different pre sintering temperatures (900, 1000, 1100 C) were prepared by the glass infiltration method. The back scattering electron image (BSE) showing the cross section of the zirconia specimen shows that the gradient structure of about 150-200 m is formed. The nano indentation test results show that the functionally gradient layer gradually increases from the surface to the internal modulus of elasticity and forms an effective elastic modulus gradient on the surface of zirconia. The results of the maximum load mechanics experiment show that the existence of the biomimetic functionally graded interface improves the compressive strength of the specimen, and the results of cyclic fatigue test suggest that the biomimetic functionally graded zirconia ceramics can bear more cyclic loading than the control group, and the surface observation of the specimens also shows the formation of the biomimetic functionally graded zirconia formation after the experiment. There are few cracks and rules. Conclusion: the 1. biomimetic interface functionally graded layer can effectively reduce the stress concentration in the bottom of the whole porcelain prosthesis. The gradient change of the internal elastic modulus of the.2. can be optimized by the glass infiltration technology. The biomimetic functionally gradient structure can be formed in the zirconia nuclear porcelain and the biomimetic functionally gradient structure can be significantly improved. The compressive and toughening properties of zirconia ceramics, and the pre sintering temperature during glass infiltration have certain effects on the mechanical properties of zirconia ceramics.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：R783.1

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