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用于生物医学应用的多孔钛的开发:松散烧结与占位技术的比较。

Development of porous titanium for biomedical applications: A comparison between loose sintering and space-holder techniques.

作者信息

Torres Yadir, Lascano Sheila, Bris Jorge, Pavón Juan, Rodriguez José A

机构信息

Department of Mechanical & Materials Engineering, E.T.S. de Ingenieros, Universidad de Sevilla, Avda. Camino de los Descubrimientos s/n., 41092 Sevilla, Spain.

Department of Mechanical Engineering, Universidad Técnica Federico Santa María, Avda. Vicuña Mackenna N° 3939, San Joaquín, Santiago, Chile.

出版信息

Mater Sci Eng C Mater Biol Appl. 2014 Apr 1;37:148-55. doi: 10.1016/j.msec.2013.11.036. Epub 2013 Dec 5.

Abstract

One of the most important concerns in long-term prostheses is bone resorption as a result of the stress shielding due to stiffness mismatch between bone and implant. The aim of this study was to obtain porous titanium with stiffness values similar to that exhibited by cortical bone. Porous samples of commercial pure titanium grade-4 were obtained by following both loose-sintering processing and space-holder technique with NaCl between 40 and 70% in volume fraction. Both mechanical properties and porosity morphology were assessed. Young's modulus was measured using uniaxial compression testing, as well as ultrasound methodology. Complete characterization and mechanical testing results allowed us to determine some important findings: (i) optimal parameters for both processing routes; (ii) better mechanical response was obtained by using space-holder technique; (iii) pore geometry of loose sintering samples becomes more regular with increasing sintering temperature; in the case of the space-holder technique that trend was observed for decreasing volume fraction; (iv) most reliable Young's modulus measurements were achieved by ultrasound technique.

摘要

长期假体中最重要的问题之一是由于骨骼与植入物之间的刚度不匹配导致应力屏蔽而引起的骨吸收。本研究的目的是获得具有与皮质骨相似刚度值的多孔钛。通过采用松散烧结工艺和体积分数在40%至70%之间的NaCl空间保持技术,获得了商业纯4级钛的多孔样品。对其力学性能和孔隙形态进行了评估。使用单轴压缩试验以及超声方法测量了杨氏模量。完整的表征和力学测试结果使我们能够确定一些重要发现:(i) 两种加工路线的最佳参数;(ii) 使用空间保持技术获得了更好的力学响应;(iii) 随着烧结温度的升高,松散烧结样品的孔隙几何形状变得更加规则;在空间保持技术的情况下,随着体积分数的降低观察到了这种趋势;(iv) 通过超声技术获得了最可靠的杨氏模量测量值。

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