首页> 外文期刊>Acta biomaterialia >In vitro structural changes in porous HA/beta-TCP scaffolds in simulated body fluid.
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In vitro structural changes in porous HA/beta-TCP scaffolds in simulated body fluid.

机译:模拟体液中多孔HA /β-TCP支架的体外结构变化。

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摘要

Porous scaffolds of biphasic calcium phosphate (hydroxyapatite/beta-tricalcium phosphate (beta-TCP)) have been fabricated and changes induced both in phase composition and porous architecture by immersion in simulated body fluid (SBF) under static and orbital stirring conditions have been studied. The starting porous scaffolds exhibit a low and randomized micro- and mesoporosity, an interconnected macroporosity centered at 100 and 0.6microm, a fractal connectivity of D=2.981 and total percent porosity of ca. 80%. After immersion for up to 60days the micro- and mesoporosity increase slightly, which could be attributed to dissolution of the beta-TCP phase confirmed by transmission electron microscopy. The effects of the change in the porous framework with SBF immersion time favor the bioactive behavior of the tested materials, inducing a nucleation and growth of a nanocrystalline apatite phase as the interconnected macroporosity centered at 0.6microm is reduced. The macroporosity centered at 100microm is still stable after 60days in SBF. Therefore, these biphasic calcium phosphate porous scaffolds combine bioactive behavior with the stability of interconnected macroporosity over large periods of soaking time in SBF under static and orbital stirring conditions.
机译:制备了双相磷酸钙多孔支架(羟基磷灰石/β-磷酸三钙(β-TCP)),并研究了在静态和轨道搅拌条件下浸入模拟体液(SBF)中引起的相组成和多孔结构变化。起始的多孔支架表现出低的和随机的微孔和中孔,互连的大孔的中心为100和0.6微米,分形连通性为D = 2.981,总孔隙率约为ca。 80%。浸入长达60天后,微孔和中孔率略有增加,这可能是由于透射电子显微镜证实了β-TCP相的溶解。随着SBF浸入时间的改变,多孔骨架的变化有利于被测材料的生物活性,诱导纳米晶磷灰石相的成核和生长,因为互连的大孔率降低了0.6微米。 SBF 60天后,以100微米为中心的大孔仍然稳定。因此,这些双相磷酸钙多孔支架在静态和轨道搅拌条件下,在SBF中长时间浸泡后,具有生物活性和相互连接的大孔稳定性。

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