J Mater Sci Mater Med:不同涂层Mg-Zn-Ca合金支架在体内修复临界尺寸骨缺损方面的降解率和有效性

2018-09-10 MedSci MedSci原创

骨缺损的外科修复仍然具有挑战性,并且正在寻找替代手术。由Mg制成的用于骨修复的装置由于其良好的生物相容性和机械性能而受到很多关注。我们开发了一种新型的Mg-Zn-Ca合金支架,其形状模仿皮质骨,可以填充颗粒骨。 我们评估了兔子尺骨缺损模型的耐久性和疗效。评估了三种类型的支架-表面涂层:A组,无涂层;B组,10μm微弧氧化涂层;C组,水热双相复合涂料;和D组,一个空缺陷对照组。在12周内获得X

骨缺损的外科修复仍然具有挑战性,并且正在寻找替代手术。由Mg制成的用于骨修复的装置由于其良好的生物相容性和机械性能而受到很多关注。我们开发了一种新型的Mg-Zn-Ca合金支架,其形状模仿皮质骨,可以填充颗粒骨。

我们评估了兔子尺骨缺损模型的耐久性和疗效。评估了三种类型的支架-表面涂层:A组,无涂层;B组,10μm微弧氧化涂层;C组,水热双相复合涂料;和D组,一个空缺陷对照组。在12周内获得X射线和微计算机断层扫描(微CT)图像以评估尺骨修复。

机械应力测试表明,每组内的骨修复随时间而明显改善(P <0.01)。通过显微CT评估不同支架的降解行为,并根据产生的氢气量进行定量。结果表明,C组支架比其他支架类型更能抵抗腐蚀(P <0.05)。钙黄绿素荧光和组织学显示B组和C组的矿物质密度和骨反应均高于A组,C组的反应最佳。

总之,我们的Mg-Zn-Ca合金支架可有效地辅助骨修复。C组支架表现出最佳的耐腐蚀性和成骨性,使其成为修复骨缺损的候选支架。

原始出处:

Nan Zhang, Dewei Zhao, et al., Assessment of the degradation rates and effectiveness of different coated Mg-Zn-Ca alloy scaffolds for in vivo repair of critical-size bone defects. J Mater Sci Mater Med. 2018; 29(9): 138.

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    2018-09-12 lfcmxl
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    2018-09-12 楚秀娟
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