种植体和/或天然牙混合支持式覆盖义齿的几种机械性能比较研究

发布时间：2022-04-28 22:38

　　目的：比较不同设计的种植体和/或天然牙支持的覆盖义齿的固位力，疲劳强度，应力分布及牙槽骨形变量。材料与方法：本研究设计12个模型，按支持形式不同分为A，B，C，D，E和F六组，其中每组有2个模型，分别使用O-ring和Dalbo弧形附着体系统；可形变丙烯酸附着体系统。A组和C组含有3个支持体：2个微型种植体（MDI）和1个模拟牙根，旋入Dalbo Rotex （DR）或微型种植体；E组仅有3个微型种植体支持。B组和D组含有4个支持体：2个MDI和2个模拟牙根；F组仅有4个MDI支持。A，B，C和D组用来评估覆盖义齿的固位力，分别记录经过0，360，720，1440和2880次取戴循环后的固位力（N）大小，每个样本重复测量5次。根据舌侧集中牙合理论，应用35N垂直负载和17.5N水平负载模拟在静态状态下的牙合力来评估其应力分布和牙槽骨形变量情况。应用ANSYS软件包（13.0）分析每个模型在附着水平和骨支持界面的最大von Mises应力和形变量。结果：应用双因素方差分析和多重比较Tukey’s检验等统计学方法比较绝对固位力（AF）和相对固位力（RF），从而分析不同分组及循环周期是否存在... 

【文章页数】：172 页

【学位级别】：博士

【文章目录】：
ABBREVIATIONS
ABSTRACT
中文摘要
Introduction
Part I: Investigation into Retention Strength and Fatigue Resistance of Various Designs of overdenture support foundation and attachments
    1. Materials
        1.1 Software and Equipment
    2. Methods
        2.1 Experimental models
        2.2 Model preparation
        2.3 Testing apparatus
        2.4 Universal testing Machine
        2.5 Mounting Procedure of testing apparatus and model on the universal testing machine
        2.6 Testing Protocol
        2.7 Statistical analysis
    3. Results
        3.1 Descriptive statistics for the Absolute Force
        3.2 Descriptive statistics for the Relative Force
        3.3 Inferential statistics
    4. Discussions
        4.1 Research study questions
        4.2 Attachment system selection
        4.3 Effect of cycles’ no. on the retention fatigue strength values
        4.4 Effect of attachment combination designs on the retention fatigue strength values
        4.5 Effect of overdenture support configuration design on the retention fatigue strength values
        4.6 Bases for selecting the no. of cycles
        4.7 Reasons behind the mini dental implant system selection
        4.8 Limitation of the retention Fatigue strength study
Part II: Investigation into Stress Distribution and Flexing Among Various Designs of overdenture support foundation and attachments
    1. Materials
        1.1 Software and Equipment used in the finite element analysis study
    2. Methods
        2.1 Study models design
        2.2 Assumption of the detailed geometries and dimensions
        2.3 Materials properties
        2.4 Generating the model
        2.5 Boundary condition and load application
        2.6 Solving the problems
        2.7 Listing the results
    3. Results
        3.1 Data collection
        3.2 Comparing vMwithin each models
        3.3 Comparing maximum flexing within each models
        3.4 Comparing vMat attachments’ levels among all models
        3.5 Comparing vMat bone-overdenture support foundations’ levels among all models
        3.6 Comparing maximum flexing at attachments and support foundation levels among all models
    4. Discussions
        4.1 Research study questions
        4.2 Importance of finite element method
        4.3 Model design considerations
        4.4 Free standing implant vs. tooth-Implant supported overdenture models and Triangular vs. Quadrangular overdenture support designs
        4.5 Stresses and flexing comparison at attachment and bone-overdenture support foundation levels
        4.6 Limitation of finite element method
Conclusions
Literature Review
    I. Overdenture; support designs and attachments
    II. Principles of Oral Structure Biomechanics
    III. Methods of Measuring Stress Distribution
    IV. Finding from Previous Retention and Wear Studies
References
AUTHOR INFORMATIONS
ACKNOWLEDGEMENTS


【参考文献】：
期刊论文
[1]下颌骨三维有限元模型的边界约束设计[J]. 周学军,赵志河,赵美英,樊瑜波.  华西口腔医学杂志. 1999(01)



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