University of Campinas (UNICAMP), Piracicaba Dental School, Department of Prosthodontics and Periodontology, Av Limeira, 901, Piracicaba, São Paulo 13414-903, Brazil; Institute of Biomaterials, Tribocorrosion and Nanomedicine (IBTN), Brazil.
Univ Estadual Paulista (UNESP), Aracatuba Dental School, Department of Surgery and Integrated Clinic, R. José Bonifácio, 1193, Aracatuba, São Paulo 16015-050, Brazil.
Mater Sci Eng C Mater Biol Appl. 2018 Nov 1;92:849-861. doi: 10.1016/j.msec.2018.07.046. Epub 2018 Jul 19.
Materials and surfaces developed for dental implants need to withstand degradation processes that take place in the oral cavity. Therefore, the aim of the study was to develop and evaluate the topographical, mechanical, chemical, electrochemical and biological properties of Ti-xZr alloys (x = 5, 10, and 15 wt%) with two surface features (machined and double acid etched). Commercially pure titanium (cpTi) and Ti-6Al-4V alloy were used as controls. Surface characterization was performed using dispersive energy spectroscopy, X-ray diffraction, scanning electron microscopy, atomic force microscopy, profilometry and surface energy. The mechanical properties were assessed using Vickers microhardness, elastic modulus and stiffness. The electrochemical behavior analysis was conducted in a body fluid solution (pH 7.4). In addition, MC3T3-E1 cells were used to determine the impact of material and surface treatment on cell morphology by SEM analysis. Data were analyzed by two-way ANOVA and Bonferroni test (α = 0.05). Ti-Zr alloys showed lower surface roughness, elastic modulus and stiffness, as well as higher hardness and surface energy when compared to cpTi. Ti-Zr system increased the polarization resistance values and significantly decreased the capacitance, corrosion current density (i), and passivation current density (i) values. The acid treatment increased the resistance and corrosion potential of the oxide layer. SEM data analysis demonstrated that Ti-Zr alloys displayed normal cell attachment/spreading and slightly changed cell morphology in the double etched surface. In conclusion, Zr addition and surface treatment altered surface, mechanical, biological and electrochemical properties of Ti material.
用于牙种植体的材料和表面需要能够承受口腔内发生的降解过程。因此,本研究的目的是开发和评估具有两种表面特征(机械加工和双重酸蚀)的 Ti-xZr 合金(x=5、10 和 15wt%)的形貌、机械、化学、电化学和生物学特性。商用纯钛(cpTi)和 Ti-6Al-4V 合金被用作对照。使用分散能谱、X 射线衍射、扫描电子显微镜、原子力显微镜、轮廓仪和表面能对表面特性进行了表征。使用维氏显微硬度计、弹性模量和刚度评估了机械性能。在体液溶液(pH=7.4)中进行了电化学行为分析。此外,使用 MC3T3-E1 细胞通过 SEM 分析来确定材料和表面处理对细胞形态的影响。使用双因素方差分析和 Bonferroni 检验(α=0.05)对数据进行分析。与 cpTi 相比,Ti-Zr 合金具有较低的表面粗糙度、弹性模量和刚度,以及更高的硬度和表面能。Ti-Zr 体系增加了极化电阻值,显著降低了电容、腐蚀电流密度(i)和钝化电流密度(i)值。酸处理增加了氧化层的电阻和腐蚀电位。SEM 数据分析表明,Ti-Zr 合金在双重蚀刻表面上显示出正常的细胞附着/扩散,并略微改变了细胞形态。总之,Zr 的添加和表面处理改变了 Ti 材料的表面、机械、生物和电化学性能。
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