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Preparation of a novel calcium phosphate-coated scaffold for bone tissue engineering

机译:新型骨组织工程磷酸钙涂层支架的制备

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Calcium phosphates (CaP) have been recognized for decades as bone-bonding biomaterials and have therefore been used either as block implants or coatings. Biodegradable polymers, shaped in 3D foams have generated considerable interest as potential scaffolds for bone tissue engineering. We have recently developed a new method to produce three-dimensional poly (lactide-co-glycolide) 75:25 foams specifically designed for bone tissue engineering and demonstrated cell invasion and tissue formation within the scaffold in vitro. In this study, we have grown CaP crystals by the Surface Induced Mineralization (SIM) technique, on our novel biodegradable foams and implanted these foams, as well as control foams with no coating, in adult Wistar rat femoral defects. The coated and non-coated foams remained in the animals for 6 days. The animals were then sacrificed, the implants removed and observed by SEM. Histological sections were also prepared from the implants and stained with Haematoxylin and Eosin. CaP coated and non-coated samples were both filled with tissue throughout their structures, confirming the usefulness of these foams for tissue engineering applications. Interdigitation of bone matrix with the CaP coating indicated that the modified scaffold surface was bone-bonding.
机译:磷酸钙(CaP)数十年来一直被认为是骨结合生物材料,因此已被用作块状植入物或涂层。作为骨组织工程的潜在支架,以3D泡沫成型的可生物降解聚合物引起了人们的极大兴趣。我们最近开发了一种新的方法来生产三维泡沫(丙交酯-共-乙交酯)75:25泡沫,该泡沫是专门为骨组织工程设计的,并证明了体外支架中的细胞入侵和组织形成。在这项研究中,我们已经通过表面诱导矿化(SIM)技术在新型可生物降解泡沫上生长了CaP晶体,并将这些泡沫以及无涂层的对照泡沫植入成年Wistar大鼠股骨缺损中。涂覆的和未涂覆的泡沫在动物中保留6天。然后处死动物,移出植入物并通过SEM观察。还从植入物制备组织切片,并用苏木精和曙红染色。 CaP涂层和未涂层​​样品均在其整个结构中都充满了组织,这证实了这些泡沫在组织工程应用中的有用性。骨基质与CaP涂层的交叉指指改性的支架表面是骨结合的。

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