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The impact of heat treatment on interactions of contact-poled biphasic calcium phosphates with proteins and cells

机译:热处理对接触极化双相磷酸钙与蛋白质和细胞相互作用的影响

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A number of studies have reported improved bone integration for calcium phosphate based materials electrically "poled" by an external electric field prior to implantation. In our study we investigated the effects of electrical polarization of a biphasic ceramic composed of 80% hydroxyapatite and 20% β-tricalcium phosphate. As contact poling involves elevated temperatures as a prerequisite for inducing charge, we used two reference types: samples without any heat treatment and poling, and samples with no poling but heat treatment identical to that of the poled samples. All heat-treated samples (poled or unpoled) showed an improved wettability, which was attributed to a reduced hydrocarbon contamination. Heat treatment alone provoked an accelerated spreading of osteoblast-like cells, whereas on poled samples a retarded cell spreading was observed. While proliferation and several differentiation markers were not influenced by either heat treatment or poling, the release of proinflammatory cytokines interleukin-6 and -8 was significantly reduced for all heat-treated samples, irrespective of additional electrical poling. The study demonstrated that the behaviour of cells in contact with poled biphasic ceramics was influenced by two parameters: heating and charge. Our data revealed that heating of the calcium phosphate ceramics had a much more pronounced effect on cell behaviour than charge.
机译:大量研究报告了在植入前通过外部电场“极化”的磷酸钙基材料的骨整合得到了改善。在我们的研究中,我们研究了由80%羟基磷灰石和20%β-磷酸三钙组成的双相陶瓷的电极化效应。由于接触极化将高温作为感应电荷的前提条件,因此我们使用了两种参考类型:未经任何热处理和极化的样品,以及没有极化但经过热处理的样品与极化样品相同。所有热处理过的样品(极化或非极化)均显示出改善的润湿性,这归因于碳氢化合物污染的减少。单独的热处理引起成骨细胞样细胞加速扩散,而在极化样品上观察到细胞扩散缓慢。尽管增殖和几种分化标记均不受热处理或极化的影响,但所有热处理过的样品的促炎细胞因子白细胞介素6和-8的释放均显着降低,而与其他电极化无关。研究表明,与两相极化陶瓷接触的电池行为受两个参数的影响:加热和充电。我们的数据表明,磷酸钙陶瓷的加热对电池行为的影响远大于电荷。

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