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. 2016 May 26;21(6):687. doi: 10.3390/molecules21060687

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© 2016 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) A typical sintered hydroxyapatite (HA) scaffold with uniform microstructure and macroporosity; (b) magnified image of fractured surface of HA filament with micropores; (c) 3D printed HA scaffold with filament deformation upon deposition due to high solvent content in paste; (d) magnified view of a 50 μm HA filament; (e) strong inter layer bonding due to sufficient solvent content in HA paste; and (f) weak layer bonding due to insufficient solvent content. The red arrow in the images (e,f) shows bonding formed between layers in the slurry state.