Properties of porous hydroxyapatite scaffolds obtained by conversion of 3D printed gypsum structures

Reference	Presenter	Authors (Institution)	Abstract
01-019	Alan C. S. Dantas	Dantas, A.C.(Universidade Federal do Vale do São Francisco); Wirth, C.(Bundesanstalt für material Forschung und Prüfung);	Hydroxyapatite (HA) is a important biomaterial with excellent biological properties. However, these properties are strongly dependent of its crystallinity degree, normally associated to poor resorption rates and related to the higher temperatures used to produce the HA bodies. This work evaluates the properties of HA samples produced from porous bodies of high purity gypsum obtained via 3D printing. The gypsum bodies were produced and subsequently converted into HA in a reaction with di-ammonium hydrogen phosphate at 100°C and pH 8. A total conversion of the samples was achieved after 36 h After conversion the 3D printed samples achieved a tensile strength of 2.0 MPa by porosities of 61%. These samples were subsequently infiltrated with polyhydroxibutirate (PHB) a biodegradable biopolymer. The infiltration promoted a increase of 300% on the mechanical properties by porosities of circa 40%.
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