人牙天然微结构的摩擦学特性研究

项目名称： 人牙天然微结构的摩擦学特性研究

项目编号： No.50805124

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 医药、卫生

项目作者： 郑靖

作者单位： 西南交通大学

项目金额： 25万元

中文摘要： 牙齿是一种特殊的人体摩擦副，优异的摩擦学特性是其行使生理功能的保证。人类牙齿的摩擦学特性强烈地依赖于其内部独特的天然微结构，因此，研究人牙天然微结构的摩擦学特性具有重要的理论价值和现实意义。本项目采用微观摩擦学测试手段，首先以相同自然状态的人牙为研究对象，研究人牙内部釉柱、釉间质等不同天然微结构的力学性能和微摩擦磨损行为，并进一步考察人牙微结构摩擦磨损行为的尺寸效应，揭示釉柱、釉间质两种微结构在人牙摩擦磨损过程中的分工和协同作用；在此基础上，研究不同自然状态人牙微结构的微摩擦磨损行为，结合生物统计学分析，考察年龄、性别、病理性变化等因素对人牙天然微结构微摩擦磨损性能的影响，揭示人牙摩擦磨损的微观本质。该研究有助于深化对天然生物摩擦副摩擦学行为的科学认识，为仿生摩擦学设计、仿生牙科修复材料开发和牙齿过度磨耗的临床防治提供重要理论基础和关键技术支持。

中文关键词： 人类牙齿；天然微结构；力学性能；微摩擦磨损；尺寸效应

英文摘要： Human tooth is a special friction pair in our body, and its excellent tribological properties are the guarantee of its normal function. Considering that the tribological properties of human teeth are strongly dependent on its internal micro-structure, therefore, study on the tribological properties of internal micro-structures within human teeth has important theoretical values and practical significance. Micro-tribology testing techniques were used in this project. At first, with the subjects which have same natural status, the mechanical and micro-tribological behavior of internal micro-structures within teeth, such as enamel rods and inter-rod enamel, were studied, and then further investigation of size effect on the friction and wear behavior of human teeth were conducted, aiming to reveal the respective roles and synergistic effect of enamel rods and inter-rod enamel in the process of tooth friction and wear; on this basis, the effects of factors, such as age, gender, pathological changes, etc, on the friction and wear behavior of tooth micro-structures were investigated, aiming to reveal the microscopic nature of tooth friction and wear. This study would help deepen the scientific understanding of tribological behavior of natural biological friction pair, provide important theoretical basis and key technical support for bionic tribological design, the development of bionic dental restorative materials and clinical treatment for excessive tooth wear.

英文关键词： Human teeth; Natural microstructure; Mechanical properties; Micro-friction and wear; Size effect