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首页> 外文期刊>Acta biomaterialia >Bioactive Ti metal analogous to human cancellous bone: Fabrication by selective laser melting and chemical treatments.
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Bioactive Ti metal analogous to human cancellous bone: Fabrication by selective laser melting and chemical treatments.

机译：类似于人类松质骨的生物活性钛金属：通过选择性激光熔化和化学处理制造。

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Selective laser melting (SLM) is a useful technique for preparing three-dimensional porous bodies with complicated internal structures directly from titanium (Ti) powders without any intermediate processing steps, with the products being expected to be useful as a bone substitute. In this study the necessary SLM processing conditions to obtain a dense product, such as the laser power, scanning speed, and hatching pattern, were investigated using a Ti powder of less than 45 mum particle size. The results show that a fully dense plate thinner than 1.8 mm was obtained when the laser power to scanning speed ratio was greater than 0.5 and the hatch spacing was less than the laser diameter, with a 30 mum thick powder layer. Porous Ti metals with structures analogous to human cancellous bone were fabricated and the compressive strength measured. The compressive strength was in the range 35-120 MPa when the porosity was in the range 75-55%. Porous Ti metals fabricated by SLM were heat-treated at 1300 degrees C for 1h in an argon gas atmosphere to smooth the surface. Such prepared specimens were subjected to NaOH, HCl, and heat treatment to provide bioactivity. Field emission scanning electron micrographs showed that fine networks of titanium oxide were formed over the whole surface of the porous body. These treated porous bodies formed bone-like apatite on their surfaces in a simulated body fluid within 3 days. In vivo studies showed that new bone penetrated into the pores and directly bonded to the walls within 12 weeks after implantation into the femur of Japanese white rabbits. The percentage bone affinity indices of the chemical- and heat-treated porous bodies were significantly higher than that of untreated implants.
机译：选择性激光熔化（SLM）是一种有用的技术，用于直接从钛（Ti）粉末制备具有复杂内部结构的三维多孔体，而无需任何中间处理步骤，并且预期该产品可用作骨替代物。在这项研究中，使用粒度小于45微米的Ti粉研究了获得致密产品的必要SLM工艺条件，例如激光功率，扫描速度和阴影图案。结果表明，当激光功率与扫描速度之比大于0.5且舱口间距小于激光直径时，可获得厚度小于1.8毫米的完全致密的板，且粉末层厚30微米。制备了具有类似于人类松质骨结构的多孔钛金属，并测量了抗压强度。当孔隙率在75-55％的范围内时，抗压强度在35-120MPa的范围内。将由SLM制造的多孔Ti金属在氩气气氛中于1300摄氏度下热处理1小时，以使表面光滑。对这样制备的样品进行NaOH，HCl和热处理，以提供生物活性。场发射扫描电子显微镜照片显示，在多孔体的整个表面上形成了细小的氧化钛网络。这些经过处理的多孔体在3天之内在模拟体液中的表面上形成了骨状磷灰石。体内研究表明，新骨在植入日本白兔股骨后的12周内渗透到毛孔中，并直接与壁结合。经过化学处理和热处理的多孔体的骨亲和指数百分比显着高于未处理的植入物。

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