title: Robotic deposition of model hydroxyapatite scaffolds with multiple architectures and multiscale porosity for bone tissue engineering.
abstract: Model hydroxyapatite (HA) scaffolds with porosities spanning multiple length scales were fabricated by robocasting, a solid freeform fabrication technique based on the robotic deposition of colloidal pastes. Scaffolds of various architectures including periodic, radial, and superlattice structures were constructed. Macropores (100-600 microm) were designed by controlling the arrangement and spacing between rods of HA. Micropores (1-30 microm) and submicron pores (less than 1 microm) were produced within the rods by including polymer microsphere porogens in the HA pastes and by controlling the sintering of the scaffolds. These model scaffolds may be used to systematically study the effects of scaffold porosity on bone ingrowth processes both in vitro and in vivo.
authors.affiliation: Department of Materials Science and Engineering, University of Illinois at Urbana--Champaign, 1304 W. Green St., Urbana, Illinois 61821, USA.
authors.forename: Jennifer G
authors.initials: JG
authors.lastname: Dellinger
authors.forename: Joseph
authors.initials: J
authors.lastname: Cesarano
authors.forename: Russell D
authors.initials: RD
authors.lastname: Jamison
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D018786:Bone Substitutes; D017886:Durapatite / Q000737:chemistry*; D004548:Elasticity; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D016348:Osseointegration; D033362:Powder Diffraction; D012212:Rheology; D012371:Robotics / Q000295:instrumentation / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared; D023822:Tissue Engineering / Q000295:instrumentation / Q000379:methods*; D014783:Viscosity
chemical_list: D001672:Biocompatible Materials; D018786:Bone Substitutes; D017886:Durapatite