3D打印羊椎骨粉/聚乙烯醇支架、纳米级羟基磷灰石/聚乙烯醇支架、羊椎骨粉/聚乙烯醇无孔骨板的性能比较

Performance comparison of 3D printing sheep vertebral bone meal/polyvinyl alcohol scaffold, nano-hydroxyapatite/polyvinyl alcohol scaffold and sheep vertebral bone meal/polyvinyl alcohol nonporous bone plate

背景:随着3D打印技术的推广,3D打印组织工程骨支架成为颌骨缺损修复的新方向。目的:对比3D打印羊椎骨粉/聚乙烯醇支架、纳米级羟基磷灰石/聚乙烯醇支架、羊椎骨粉/聚乙烯醇无孔骨板的理化与生物性能。方法:利用3D打印技术,分别打印出羊椎骨粉/聚乙烯醇支架、纳米级羟基磷灰石/聚乙烯醇支架、羊椎骨粉/聚乙烯醇无孔骨板,进行孔隙率、扫描电镜、吸水率及压缩力学性能测定;将3种支架分别与骨髓间充质干细胞共培养1,4,7 d,采用CCK-8法检测细胞增殖。结果与结论:(1)扫描电镜观察:纳米级羟基磷灰石/聚乙烯醇支架、羊椎骨粉/聚乙烯醇支架孔隙规则,网状结构清晰,孔隙间存在广泛交通,连续性好;羊椎骨粉/聚乙烯醇无孔骨板没有明显孔隙,但表面有大小不一微孔,材料致密,分布均匀;(2)孔隙率:纳米级羟基磷灰石/聚乙烯醇支架孔隙率低于羊椎骨粉/聚乙烯醇支架(P<0.05);(3)吸水率:在不同时间点,纳米级羟基磷灰石/聚乙烯醇支架>羊椎骨粉/聚乙烯醇支架>羊椎骨粉/聚乙烯醇无孔骨板(P<0.05);(4)压缩力学性能:羊椎骨粉/聚乙烯醇支架的韧性高于纳米级羟基磷灰石/聚乙烯醇支架,低于羊椎骨粉/聚乙烯醇无孔骨板;(5)细胞毒性:羊椎骨粉/聚乙烯醇支架的细胞增殖活性高于其余两组支架(P<0.05);(6)结果表明:3D打印羊椎骨粉/聚乙烯醇支架具有良好的物理及化学性能。

BACKGROUND：With the promotion of 3D printing technology, 3D printing scaffolds for bone tissue engineering have become the new ideas for jaw bone repair. OBJECTIVE：To compare the physical and biological properties of sheep vertebral bone meal/polyvinyl alcohol （PVA） scaffold, nano-hydroxyapatite （nHA）/PVA scaffold, and sheep vertebral bone meal/PVA nonporous bone plate. METHODS：3D printing technology was used to print sheep vertebral bone meal/PVA scaffold, nHA/PVA scaffold, and sheep vertebral bone meal/PVA nonporous bone plate. Porosity, morphology, water absorption rate and mechanical properties of different scaffolds were detected. Three kinds of scaffolds were al used to culture bone marrow mesenchymal stem cel s, and cel proliferation ability was detected using cel counting kit-8 at 1, 4, 7 days of culture. RESULTS AND CONCLUSION：Under scanning electron microscope, the sheep vertebral bone meal/PVA scaffold and nHA/PVA scaffold exhibited regular and interconnected pores with good continuity and clear network structure;the sheep vertebral bone meal/PVA nonporous bone plate had no obvious pores;however, it had dense and evenly distributed micropores with different sizes on its surface. The porosity of nHA/PVA scaffold was lower than that of the sheep vertebral bone meal/PVA scaffold （P〈0.05）. The water absorption rate was highest for the nHA/PVA scaffold fol owed by the sheep vertebral bone meal/PVA scaffold and the sheep vertebral bone meal/PVA nonporous bone plate （P〈0.05）. In contrast, the scaffold toughness was highest for the sheep vertebral bone meal/PVA nonporous bone plate, fol owed by the sheep vertebral bone meal/PVA scaffold and nHA/PVA scaffold. In addition, the cel proliferation activity of cel s cultured on the sheep vertebral bone meal/PVA scaffold was significantly higher than that cultured on the other two kinds of scaffolds. Taken together, the 3D printing sheep vertebral bone/PVA scaffold has good physical and chemical performance.