首页> 外文期刊>Acta biomaterialia >Supercritical CO 2 fluid-foaming of polymers to increase porosity: A method to improve the mechanical and biocompatibility characteristics for use as a potential alternative to allografts in impaction bone grafting?
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Supercritical CO 2 fluid-foaming of polymers to increase porosity: A method to improve the mechanical and biocompatibility characteristics for use as a potential alternative to allografts in impaction bone grafting?

机译:超临界CO 2流体 - 聚合物的流体发泡,以增加孔隙率:一种改善机械和生物相容性特性的方法,用作异种移植物中的同种异体移植物的潜在替代方法?

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摘要

Disease transmission, availability and cost of allografts have resulted in significant efforts to find an alternative for use in impaction bone grafting (IBG). Recent studies identified two polymers with both structural strength and biocompatibility characteristics as potential replacements. The aim of this study was to assess whether increasing the polymer porosity further enhanced the mechanical and cellular compatibility characteristics for use as an osteogenic biomaterial alternative to allografts in IBG. Solid and porous poly(DL-lactide) (P DLLA) and poly(DL-lactide-co-glycolide) (P DLLGA) scaffolds were produced via melt processing and supercritical CO 2 foaming, and the differences characterized using scanning electron microscopy (SEM). Mechanical testing included milling and impaction, with comparisons made using a shear testing rig as well as a novel agitation test for cohesion. Cellular compatibility tests for cell number, viability, and osteogenic differentiation using WST-1 assays, fluorostaining, and ALP assays were determined following 14 day culture with skeletal stem cells. SEM showed excellent porosity throughout both of the supercritical-foam-produced polymer scaffolds, with pores between 50 and 200 μm. Shear testing showed that the porous polymers exceeded the shear strength of allograft controls (P 0.001). Agitation testing showed greater cohesion between the particles of the porous polymers (P 0.05). Cellular studies showed increased cell number, viability, and osteogenic differentiation on the porous polymers compared to solid block polymers (P 0.05). The use of supercritical CO 2 to generate porous polymeric biodegradable scaffolds significantly improves the cellular compatibility and cohesion observed compared to non-porous counterparts, without substantial loss of mechanical shear strength. These improved characteristics are critical for clinical translation as a potential osteogenic composite for use in IBG.
机译:疾病传输,同种异体移植物的可用性和成本导致了替代在撞击骨移植(IBG)中使用的替代方案。最近的研究确定了两种具有结构强度和生物相容性特性的聚合物作为潜在的替代品。本研究的目的是评估是否增加了聚合物孔隙率进一步增强了机械和细胞相容性特性,以用作IBG中同种异体移植物的骨草生物材料替代品。通过熔融加工和超临界CO 2发泡制备固体和多孔聚(DL-丙交酯)(P DLLA)和聚(DL-丙交酯 - 共乙酰化)(P DLLGA)支架,并使用扫描电子显微镜表征的差异(SEM )。机械测试包括铣削和刻录,使用剪切测试钻机进行了比较,以及用于凝聚力的新型搅拌测试。使用WST-1测定,氟化物和ALP测定的细胞数,活力和成骨分化的细胞相容性试验在14天的培养物后测定骨干干细胞。 SEM在整个超临界泡沫产生的聚合物支架中显示出优异的孔隙,孔在50至200μm之间。剪切测试表明,多孔聚合物超过同种异体移植对照的剪切强度(P <0.001)。搅拌测试显示多孔聚合物的颗粒之间的含可较大(P <0.05)。与固体嵌段聚合物相比,细胞研究表明,与固体嵌段聚合物相比,多孔聚合物上的细胞数,活力和成骨分化增加(P <0.05)。超临界CO 2产生多孔聚合物可生物降解支架显着提高了与无孔对应物相比观察到的细胞相容性和内聚力,而无需大量的机械剪切强度损失。这些改进的特性对于临床翻译至关重要作为IBG用于IBG的潜在成骨复合材料。

著录项

  • 来源
    《Acta biomaterialia》 |2012年第5期|共10页
  • 作者单位

    Bone and Joint Research Group Human Development and Health University of Southampton Medical;

    School of Chemistry University Park University of Nottingham Nottingham NG7 2RD United Kingdom;

    Bone and Joint Research Group Human Development and Health University of Southampton Medical;

    Bone and Joint Research Group Human Development and Health University of Southampton Medical;

    Bone and Joint Research Group Human Development and Health University of Southampton Medical;

    Bone and Joint Research Group Human Development and Health University of Southampton Medical;

    School of Pharmacy University Park University of Nottingham Nottingham NG7 2RD United Kingdom;

    School of Chemistry University Park University of Nottingham Nottingham NG7 2RD United Kingdom;

    Bone and Joint Research Group Human Development and Health University of Southampton Medical;

    Bone and Joint Research Group Human Development and Health University of Southampton Medical;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 普通生物学;
  • 关键词

    Biocompatibility; Bone tissue engineering; Mesenchymal stem cell; Porosity; Scaffold;

    机译:生物相容性;骨组织工程;间充质干细胞;孔隙率;脚手架;

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