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Bulk properties and bioactivity assessment of porous polymethylmethacrylate cement loaded with calcium phosphates under simulated physiological conditions

机译:模拟生理条件下磷酸钙负载的聚甲基丙烯酸甲酯多孔水泥的体积特性和生物活性评估

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摘要

Polymethylmethacrylate (PMMA) cements are widely used in spinal surgery. Nevertheless, these types of cements present some documented drawbacks. Therefore, efforts have been made to improve the properties and biological performance of solid PMMA. A porous structure would seem to be advantageous for anchoring purposes. This work studied the bulk physicochemical, mechanical and interconnectivity properties of porous PMMA cements loaded with various amounts of calcium phosphate (CaP). As a measure of bioactivity, changes of PMMA cements under simulated physiological conditions were studied in a calcium phosphate solution for 0, 3, 7, 14, 21 and 28 days. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), micro-computed tomography (μ-CT) and mechanical compression tests were performed to characterize the morphology, crystallographic and chemical composition, interconnectivity and mechanical properties, respectively. SEM allowed observing the result of loading CaP into the porous PMMA, which was corroborated by XRD, FTIR and μ-CT. No interference of the CaP with the PMMA was detected. μ-CT described similar interconnectivity and pore distribution for all CaP percentages. Mechanical properties were not significantly altered by the CaP percentages or the immersion time. Hence, porous PMMA was effectively loaded with CaP, which provided the material with properties for potential osteoconductivity.
机译:聚甲基丙烯酸甲酯(PMMA)水泥广泛用于脊柱外科。然而,这些类型的水泥存在一些已记录的缺点。因此,已经做出努力以改善固体PMMA的性质和生物学性能。多孔结构对于锚固目的似乎是有利的。这项工作研究了负载有各种磷酸钙(CaP)的多孔PMMA水泥的整体物理化学,机械和互连特性。作为生物活性的量度,在磷酸钙溶液中研究了0,3,7,14,21和28天的模拟生理条件下PMMA水泥的变化。进行了扫描电子显微镜(SEM),X射线衍射(XRD),傅里叶变换红外光谱(FTIR),微计算机断层扫描(μ-CT)和机械压缩测试,以表征形态,晶体学和化学组成,互连性和机械性能分别。扫描电镜可以观察到将CaP加载到多孔PMMA中的结果,XRD,FTIR和μ-CT证实了这一点。未检测到CaP对PMMA的干扰。 μ-CT对所有CaP百分比都描述了相似的互连性和孔分布。 CaP百分比或浸入时间不会明显改变机械性能。因此,多孔PMMA有效地负载有CaP,这为材料提供了潜在的骨电导性。

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