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首页> 外文期刊>Acta biomaterialia >Bioactive materials: In vitro investigation of different mechanisms of hydroxyapatite precipitation
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Bioactive materials: In vitro investigation of different mechanisms of hydroxyapatite precipitation

机译：生物活性材料：对羟基磷灰石沉淀不同机制的体外调查

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Bioactive materials, able to induce hydroxyapatite precipitation in contact with body fluids, are of great interest for their bone bonding capacity. . The aim of this paper is to compare bioactive materials with different surface features to verify the mechanisms of action and the relationship with kinetics and type of precipitated hydroxyapatite over time. Four different surface treatments for Ti/Ti6AI4V alloy and a bioactive glass were selected and a different mechanism of bioactivity is supposed for each of them. Apart from the conventional techniques (FESEM, XPS and EDX), less common characterizations (zeta potential measurements on solid surfaces and FTIR chemical imaging) were applied. The results suggest that the OH groups on the surface have several effects: the total number of the OH groups mainly affects hydrophilicity of surfaces, while the isoelectric points, surface charge and ions attraction mainly depend on OH acidic/basic strength. Kinetics of hydroxyapatite precipitation is faster when it involves a mechanism of ion exchange while it is slower when it is due to electrostatic effects . The electrostatic effect cooperates with ion exchange and it speeds up kinetics of hydroxyapatite precipitation. Different bioactive surfaces are able to differently induce precipitation of type A and B of hydroxyapatite, as well as different degrees of crystallinity and carbonation.
机译：生物活性材料，能够诱导与体液接触的羟基磷灰石沉淀，对其骨粘合能力具有很大的兴趣。 。本文的目的是将生物活性材料与不同的表面特征进行比较，以验证动作的作用机制以及随着时间的推移与动力学和沉淀的羟基磷灰石的关系。选择了用于Ti / Ti6ai4V合金的四种不同的表面处理和生物活性玻璃，并且对它们中的每一个都有不同的生物活性机制。除了传统技术（FESEM，XPS和EDX）之外，还施加了较少的常见表征（固体表面上的Zeta电位测量和FTIR化学成像）。结果表明，表面上的OH基团具有几个效果：OH基团的总数主要影响表面的亲水性，而等电点，表面电荷和离子吸引力主要取决于OH酸性/碱性强度。当它涉及离子交换机制时，羟基磷灰石沉淀的动力学是更快的，而当它是由于静电效应时较慢。静电效应与离子交换配合，加速羟基磷灰石沉淀的动力学。不同的生物活性表面能够以不同地诱导羟基磷灰石A和B的沉淀，以及不同程度的结晶度和碳酸化。

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