有机相对人牙釉质力学性能影响的有限元分析

发布时间：2018-04-09 07:49

本文选题：人牙釉质　切入点：有机相　出处：《润滑与密封》2014年07期

【摘要】：人牙釉质是最硬的人体组织,对咀嚼磨耗有较大的抵抗力,其由羟基磷灰石晶体和有机物相间排列而成,显微组织结构与纤维增强材料类似。采用有限元方法分别建立原始牙釉质和去除有机相牙釉质2种模型,研究牙釉质中的有机相对其力学性能的影响。研究结果表明,牙釉质具有各向异性的力学性能,随着偏离羟基磷灰石晶体C轴方向的角度增加,釉质的压缩弹性模量和压缩屈服应力降低,在45°方向达到最小值;牙釉质中的有机相会显著影响其力学性能,当有机相被去除后,牙釉质的压缩弹性模量、剪切弹性模量和剪切屈服应力均降低,压缩屈服应力无显著变化。研究结果有助于揭示牙釉质化学组成和微观结构对其力学性能的影响,为牙科修复材料的仿生设计提供理论依据。
[Abstract]:Human tooth enamel is the hardest tissue of human body, and it has great resistance to masticatory wear. It is composed of hydroxyapatite crystal and organic material, and its microstructure is similar to that of fiber reinforced material.Two models of primary enamel and organic enamel removal were established by finite element method to study the effect of organic in enamel on its mechanical properties.The results show that the enamel has anisotropic mechanical properties. The compressive elastic modulus and compressive yield stress of enamel decrease with the increase of angle deviating from the C-axis direction of hydroxyapatite crystal, and reach the minimum value in the direction of 45 掳.The mechanical properties of enamel were significantly affected by organic phase. When the organic phase was removed, the compressive elastic modulus, shear elastic modulus and shear yield stress of enamel decreased, but the compressive yield stress did not change significantly.The results are helpful to reveal the influence of chemical composition and microstructure of enamel on the mechanical properties of dental enamel and provide theoretical basis for the bionic design of dental restoration materials.
【作者单位】：西南交通大学材料先进技术教育部重点实验室摩擦学研究所;
【基金】：国家自然科学基金项目(51222511) 四川省杰出青年科学基金项目(2012JQ0016)
【分类号】：R318.01;TH117.1

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