【作者】 张杰；

【导师】 周仲荣；

【作者基本信息】 西南交通大学 ， 机械设计及理论， 2003， 硕士

【摘要】 摩擦学研究正逐渐深入到各个学科领域。牙齿作为一类特殊的摩擦副有着与其它摩擦副不同的特点，而牙科修复材料作为特殊的功能材料，除了它的机械力学性能、生物相容性、防腐耐蚀等性能外，它的摩擦学特性正引起越来越多的科研人员的关注。 本论文在高精度卧式摩擦磨损试验机上，采用球/面接触模式，体外模拟了牙齿在口腔中的咀嚼运动。主要参数为：F_?=20N，D=1 mm，f=2Hz，N=5000次。并利用表面轮廓仪、共焦激光扫描显微镜和电子能谱等微观分析手段，系统地研究了天然牙及牙科修复材料的摩擦学特性，并考察了柠檬酸类饮料对天然牙釉质及成品塑料义齿耐磨性的影响。本研究旨在为牙科修复材料的选择和匹配，以及临床工作提供理论依据，以便更好地保护人类自身器官，延长修复体寿命。 试验结果表明，天然牙的硬度和耐磨性从外到内呈梯度下降，牙釉质具有优异的摩擦学特性；比较牙科修复材料的摩擦磨损行为可以发现，高斯牙、自凝造牙粉、铜基合金、镍镉合金和纯钛是较为理想的牙科修复材料，跟牙釉质有较好的摩擦学匹配性，但均会导致釉牙本质界和牙本质快速磨损；经柠檬酸类饮料浸泡后，牙釉质的硬度大幅下降，表面出现明显的酸蚀现象，耐磨性降低，而塑料义齿的硬度和耐磨性均无明显变化，具有良好的抗酸性能。更多还原

【Abstract】 The study of tribology has gradually extended to many fields. To be a special friction pair, teeth have some different characteristics from others. As special functional materials, dental prosthetic materials should have not only good mechanical properties, biocompatibility and corrosion resistance, but also excellent tribological performance.To simulate masticatory motion, two-body in vitro wear tests were carried out. The contact is in a ball-on-flat configuration with a reciprocating horizontal tribometer. A normal force of 20 N, reciprocating amplitude of 500 μm, and frequency of 2Hz were used for all the wear tests. Tests up to 5000 cycles were made with artificial saliva bath lubrication. The friction and wear behaviours of natural teeth and dental prosthetic materials were examined by optical microscope, laser scanning microscope and energy dispersive spectroscope. Wear depth was measured by a profilometer. A special attention was paid to the effect of citric acid drink on the wear resistance of natural enamels and plastic teeth. The objective of this paper is to make a theoretical foundation for choosing dental prosthetic materials and clinical treatment for teeth so as to protect the organ of human being and prolong the lifetime of prosthesis.The hardness and the wear resistance of natural teeth gradually decrease from the outer to the inner of corona dentis. Enamel has bettertribological properties than those of enamel-dentinal junction and dentin; The friction and wear behaviors of dental prosthetic materials imply that GAOSI tooth, self-setting dentifrice, copper-base alloy, Ni-Cr alloy and pure Ti are relatively ideal prosthetic materials. When in contact with natural tooth, these materials don’ t deteriorate the wear of enamel, but the wear of enamel-dentinal junction and dentin; The citric acid drink evidently reduces the hardness and the wear resistance of enamel, and the surface of enamel is characterized byobvious erosion. But no significant influence of the citric acid is observed on the hardness and wear resistance of plastic teeth.更多还原