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8月31日
Keynote 3: Magnesium degradation as seen by artificial neuronal networks (ANN)
Regine Willumeit
Institute of Materials Research, Helmholtz-Zentrum Geesthacht
考虑到降解的影响非常复杂,采用人造神经网络方法来模拟。输入9个参数(protein、CO2、temperature、O2、NaCl、NaHCO3、CaCl2、MgSO4、Glucose),形成一个9乘以70的数据点,通过填入已经测试的纯镁的结果训练神经网络,考虑单变量和多变量(不同个数的组合)的情况,可以看到各个因素对降解的影响程度,以及组合起来的影响。结果认为CO2 NaCl是最重要的,中等重要的是蛋白质和温度,氧气是低等重要性的需要进一步研究的是NaHCO3、CaCl2、MgSO4和Glucose,Buffer引起复杂非线性效应。
Comparison of the reaction of bone-derived cells to high magnesium concentrations
Anna Burmester
Helmholtz-Zentrum Geesthacht, Germany
利用不同浓度的MgCl2,与MG63、SaoS2、 U2OS细胞系培养1周和原代人的osteoblasts培养4周研究细胞Proliferation viability cell size, cell shape, gene expression
Antimicrobial effects of dual aluminium and oxygen plasma modified biodegradable Mg-Y-Re alloy
Kelvin W.K. Yeung
The University of Hong Kong, China
在Mg-Ca和Mg-Sr合金表面利用等离子注入技术分别制备Zr和Zr-O膜,厚度在几十个纳米,表征薄膜,并研究细胞粘附和抗菌性能。
In vitro and in vivo degradation behaviour and biocompatibility of Mg-Nd-Zn-Zr alloy as orthopaedic applications
Guangyin Yuan
Shanghai Jiao Tong University, China
骨科用镁合金:强度大于250MPa,延伸率大于10%, 降解在6个月以上。
将JDBM-2骨钉和骨板植入兔子周取出做了力学测试,C-JDBM植入18周还可以保持70%原始强度。
Corrosion Protection and Improved Cytocompatibility of Biodegradable Polymeric Layer-by-Layer Coatings on AZ31 Magnesium Alloys
Nicole Ostrowski
University of Pittsburgh, USA
AZ31合金表面先形成 Mg(OH)2转化膜,再阴离子:PEI(intial)PAH(subsequent) 阳离子PLGA 50:50PLGA75:25和 PCLP层层自组装膜。
启示:对于表面改性,未来打算观察大于4周后薄膜破裂后的细胞毒性。
Characterization of in vivo corrosion by 2D XRF and mass spectrometry techniques
Carla Vogt
Gottfried Wilhelm Leibniz University Hannover, Germany
利用各种质谱(SIMS、micro-XRF、PIXE)研究组织切片中的降解产物和剩余物的成分分布信息。
Corrosion And Cytotoxicity Study On Biodegradable Iron Alloys
P. Quadbeck
Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), Germany
Fe-0.6P、Fe-W Fe-B做成多孔的,希望用于骨科。
8月31日下午
Biocompatibility of fluoride-coated magnesium-calcium alloys with optimized degradation kinetics in a subcutaneous mouse model
Matthias Peuster
University of Chicago, USA
Mg-0.4,0.6,0.8,1.0Ca合金 JBMR A 2012的文章
6个月后Mg-0.6Ca降解最快,所有的植入物6个月口都形成了纤维包裹。
未来目标是血管支架。
Micro-arc Oxidation of Biodegradable Magnesium Implant: In Vivo Findings of a Rat Study
Stefan Franz Fischerauer
Medical University of Graz, Austria
采用ZX50合金利用鼠模型进行在体研究,有趣的是没有MAO处理的12周完全降解,而MAO处理的由于有裂纹和空洞8周就降解完毕。
In vivo inverse-preference corrosion phenomena between Mg2Ca(Zn) and primary Mg phase of Mg-Ca-Zn ternary alloy
Jae Young Jung
Korea Institute of Science and Technology, Korea
介绍了Mg-Ca和Mg-Ca-Zn的动物实验,认为里面有三个腐蚀:Mg2Ca preference corrosion, Mg2Caand alfa-Mg corrosion simultaneously, alfa-Mg preference corrosion
Craniofacial Magnesium Screws in the Rabbit Mandible
Alejandro Almarza
University of Pittsburgh, USA
纯镁和AZ31做成螺钉植入兔的下颌骨4,8,12周,纯镁4周降解8周比较明显,AZ31略好。
Open Porous Magnesium-Implants Provide Sufficient Cytotoxicity and Biocompatibility
Katharina Bobe
Laboratory for Biomechanics and Biomaterials, Hannover Medica, Germany
W4(MgY4) 和WZ21纤维烧结制成10-250微米多孔,孔隙率50-90%的多孔结构。3毫米之间植入兔子6、12、24周,有骨长入。但初期general corrosion过快。
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