Chinese Journal of Tissue Engineering Research ›› 2017, Vol. 21 ›› Issue (18): 2839-2845.doi: 10.3969/j.issn.2095-4344.2017.18.009
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Xie Hui1, 2, Ma Zhi-jie2, Wang Jian-chuan2, Wang Ben-jie2, Wang Wei2, Wei Xiao-wei2, Zhao De-wei1, 2
Received:
2017-04-01
Online:
2017-06-28
Published:
2017-07-07
Contact:
Zhao De-wei, Chief physician, Professor, Department of Biomedical Engineering, Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116023, Liaoning Province, China; Department of Orthopedics, Zhongshan Hospital of Dalian University, Dalian 116001, Liaoning Province, China
About author:
Xie Hui, Studying for doctorate, Attending physician, Department of Biomedical Engineering, Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116023, Liaoning Province, China; Department of Orthopedics, Zhongshan Hospital of Dalian University, Dalian 116001, Liaoning Province, China
Supported by:
the Key Projects in the National Science & Technology Pillar Program during the Twelfth Five-Year Plan Period, No. 2012BAI17B02; the National Major Research and Development Plan during the Thirteenth Five-Year Plan Period, No. 2016YFC1102000
CLC Number:
Xie Hui, Ma Zhi-jie, Wang Jian-chuan, Wang Ben-jie, Wang Wei, Wei Xiao-wei, Zhao De-wei.
2.2 钽金属涂层前后多孔碳化硅支架的表面形貌 利用超景深三维数字显显微系统观察多孔碳化硅支架喷涂前后表面特征变化,结果见图3所示,涂层前其多孔表面形态明显粗糙,造成这种微观表面结构的原因是采用快速成形技术的特点决定的,从图中可看出涂层前后孔隙表面形貌发生了明显变化,涂层后的形貌比较粗糙,这种表面的微观结构改变是由快速成形及烧结技术特点决定的。因为快速成形及烧结技术是分层累积烧结成形技术,在分层制造过程中必然会形成上述表面特征;另外,可见涂层后的多孔表面钽金属沉积均匀,并将基体完全包裹在内。目前已有研究证实,这些凹凸不平的粗糙表面不仅有利于细胞的粘附和组织的嵌入,而且还有利于组织的爬行替代,形成完整的支架,增加与骨组织的连接强度。 由于涂层前多孔碳化硅支架的色泽比较明亮,在数字显微图像中显示了较强的反光性,不利于细微结构清晰显示,但涂层后的多孔碳化硅支架表面的反光性明显减弱,可以清晰的观察多孔支架的细微结构和孔的形态特征,展现了良好的三维连通性。 "
2.3 钽涂层多孔碳化硅支架的扫描电镜照片和EDX能谱分析 图4为钽涂层多孔碳化硅支架的扫描电镜照片和EDX能谱分析结果。钽金属薄膜基本完全覆盖支架的所有空隙表面,无明显钽涂层断裂及脱层现象,在其横断面上可以测量出钽金属涂层的厚度为8-10 μm,但在多孔连接的内侧面,涂层厚度有所不均(图4A),因此,在植入体内后可能会影响支架的生物学性能。因此,需要对化学气相沉积涂层工艺进一步优化,以提高钽金属涂层厚度的均匀性及力学强度,避免植入后对细胞和组织长入产生不利影响。EDX结果分析显示,支架表面沉积了大量物质,其主要成分为钽金属(图4B);因此可以证明采用化学气相沉积技术是完全可将五氯化钽均匀沉积在多孔碳化硅支架表面,进而得到新的多孔钽金属材料。 "
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