Porous hydroxyapatite (HA) and related calcium phosphate ceramic materials with open-pore structures are of particular interest, since they have excellent permeability and a large surface area as well as excellent biocompatibility [1]. Among different techniques that be used to produce foams, gel-casting has significant advantages over others, in terms of dimensional accuracy and complex shaping capabilities, and moreover, the uniform structure and high strength of HA ceramics by gel casting will surely give high reliability to HA parts for clinical applications [2].
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