首页> 外文期刊>Acta biomaterialia >Hierarchical pore structure of calcium phosphate scaffolds by a combination of gel-casting and multiple tape-casting methods.
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Hierarchical pore structure of calcium phosphate scaffolds by a combination of gel-casting and multiple tape-casting methods.

机译:通过凝胶浇铸和多种胶带浇铸方法的组合,磷酸钙支架的层级孔结构。

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The objective of this work was to design hierarchical pore structure scaffolds with potential applications in bone tissue regeneration. For that purpose, a bioceramic material such as biphasic calcium phosphate, which consists of a mixture of hydroxyapatite and beta-tricalcium phosphate, was selected. Multilayer pieces (MLP) with hierarchical pore structure were developed employing a new technique that combines gel casting and adding porogens, using multiple tape-casting methods. Pieces with functionally graded porosity were fabricated using porogens with different sizes. The porogens used were Porlat K85 and Porlat K86 with diameters <150mum and 150-300mum, respectively. Two types of sintered tapes, with different porosity, no cracking and enough interconnection size were selected. MLP with hierarchical pore structure were designed by the multiple tape-casting method. Interconnected pores whose sizes increase from interior tapes (1.6-3.6mum) towards exterior tapes (20-51.5mum) and interpenetration between tapes were achieved. Delamination or cracking were not observed after heat treatment. The flexural strength of pieces was investigated by the three-point bending test. This new combination of methods offers the possibility of manufacturing scaffolds with interconnected pore sizes ranging from 1.6 to 51.5mum.
机译:这项工作的目的是设计分层的孔隙结构支架,在骨组织再生中具有潜在的应用。为此,选择了一种生物陶瓷材料,例如双相磷酸钙,它由羟基磷灰石和β-磷酸三钙的混合物组成。具有分层孔结构的多层件(MLP)是采用一种新技术开发的,该技术结合了凝胶浇铸和添加致孔剂的技术,并使用了多种流延铸造方法。使用具有不同尺寸的成孔剂来制造具有功能梯度孔隙度的零件。所使用的成孔剂分别是直径<150μm和150-300μm的Porlat K85和Porlat K86。选择了两种类型的烧结带,它们具有不同的孔隙率,没有破裂和足够的互连尺寸。采用多层流延法设计了具有分层孔结构的MLP。实现了相互连通的孔,其尺寸从内部胶带(1.6-3.6mum)增加到外部胶带(20-51.5mum),并且胶带之间互穿。热处理后未观察到分层或开裂。通过三点弯曲试验研究了片的弯曲强度。这种新的方法组合提供了制造相互连接的孔径从1.6到51.5mum的支架的可能性。

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