Centro Nacional de Investigaciones Metalúrgicas, Avenida Gregorio del Amo 8, E-28040 Madrid, Spain.
Acta Biomater. 2011 Jun;7(6):2716-25. doi: 10.1016/j.actbio.2011.02.040. Epub 2011 Mar 5.
The long-term interfacial bond between an implant and bone may be improved by creating a rough surface on the implant in order to increase the surface area available for bone/implant apposition. A natural consequence of surface roughening is an increase in metal ion release, which is itself a surface dominated process. Based on this fact, the aim of this work is to study the influence of the microstructure and topography on the barrier properties of oxide scales thermally generated at 700 °C for 1h on Ti6Al4V surfaces after blasting with Al(2)O(3) particles (coarse) or SiO(2) and ZrO(2) particles (fine). The microstructural and topographical characterization of the thermally treated blasted surfaces has been studied by means of scanning electron microscopy coupled with energy dispersive X-ray analysis, contact profilometry and X-ray diffraction. The barrier properties and corrosion behaviour of the oxide layers have been studied by means of electrochemical impedance spectroscopy (EIS) in Hank's solution. Thermal treatment at 700 °C for 1h promotes the formation of oxide scales with different morphologies and crystalline structures depending on the degree of deformation of the blasted surface. The oxide scale grown on the finely blasted sample has a pine needle-like morphology which is mainly formed of anatase TiO(2). In contrast, the oxide scale grown on the coarsely blasted sample has a globular morphology formed mainly of rutile TiO(2). The differences in morphology, i.e. fine or coarse, of the oxide scales influence the corrosion response of the blasted thermally treated samples in Hank's solution. The EIS results permit evaluation of the different oxide scales from the capacitance and resistance values obtained in the high-frequency region and show a good correlation between the morphology and barrier properties. Oxidation treatment at 700 °C for 1h of Ti6Al4V samples coarsely blasted with Al(2)O(3) improves the corrosion behaviour due to an increase in the thickness of a compact, ordered and more structurally stable oxide scale. This is due to the globular morphology of the rutile (TiO(2)) structure maintaining an average surface roughness suitable for optimal osseo-integration with long-term interfacial bonding between the implant and bone.
种植体与骨之间的长期界面结合可以通过在种植体表面制造粗糙表面来改善，从而增加可供骨/种植体附着的表面积。表面粗糙化的一个自然结果是金属离子释放的增加，而这本身就是一个表面主导的过程。基于这一事实，本工作的目的是研究微观结构和形貌对 Ti6Al4V 表面经 Al(2)O(3)（粗）或 SiO(2)和 ZrO(2)（细）颗粒喷砂后，在 700°C 下热生成 1 小时的氧化层的阻挡性能的影响。通过扫描电子显微镜结合能量色散 X 射线分析、接触式轮廓仪和 X 射线衍射研究了经热处理的喷砂表面的微观结构和形貌特征。通过在 Hank's 溶液中的电化学阻抗谱（EIS）研究了氧化层的阻挡性能和腐蚀行为。在 700°C 下热处理 1 小时会根据喷砂表面的变形程度，促进具有不同形貌和晶体结构的氧化层的形成。在细喷砂样品上生长的氧化层具有松针状形貌，主要由锐钛矿 TiO(2)组成。相比之下，在粗喷砂样品上生长的氧化层具有球形形貌，主要由金红石 TiO(2)组成。氧化层的形貌差异，即粗糙或精细，会影响在 Hank's 溶液中经喷砂和热处理的样品的腐蚀响应。EIS 结果可以通过在高频区获得的电容和电阻值来评估不同的氧化层，并显示出形貌和阻挡性能之间的良好相关性。Ti6Al4V 样品经 Al(2)O(3)粗喷砂后在 700°C 下氧化 1 小时，由于致密、有序且结构更稳定的氧化层厚度增加，改善了腐蚀行为。这是由于金红石（TiO(2)）结构的球形形貌保持了适合与植入物和骨骼之间的长期界面结合的最佳骨整合的平均表面粗糙度。
