Mechanical Behavior in Compression and Flexure of Bioactive Glass (13-93) Scaffolds Prepared by Robotic Deposition

Abstract

There is a need to develop synthetic scaffolds for repairing large defects in load-bearing bones. Our recent work has shown the ability to create strong porous scaffolds of bioactive glass with a gridlike microstructure by robotic deposition (robocasting) which have compressive strengths comparable to cortical bone. In the present work, the mechanical properties of those 13-93 bioactive glass scaffolds were evaluated in compressive and flexural loading to determine their strength, elastic modulus, and Weibull modulus. The scaffolds had a porosity of~50%, a glass filament diameter of -300 ìé, and a pore width of-300 ìé in the plane of deposition (xy plane) and -150 ìé in z direction. The load in both testing modes was applied in the z direction, and the scaffolds were tested as-fabricated and after immersion in a simulated body fluid (SBF) in vitro. As fabricated, the scaffolds had a strength = 86 ± 9 MPa, elastic modulus = 13 ± 2 GPa, and Weibull modulus = 12 in compression. The strength, elastic modulus, and Weibull modulus in flexure were 11 + 3 MPa, 13 ± 2 GPa, and 6, respectively. The compressive strength and elastic modulus decreased markedly during the first 2 weeks of immersion in SBF, but more slowly thereafter. The consequences of these results for the potential application of this type of bioactive glass scaffold in the regeneration of loaded bone are discussed.

Meeting Name

Next Generation Biomaterials and Surface Properties of Biomaterials Symposia -- Materials Science and Technology (2012: Oct. 27-31, Pittsburgh, PA)

Department(s)

Nuclear Engineering and Radiation Science

Second Department

Materials Science and Engineering

Keywords and Phrases

Filament diameter; Flexural loading; Mechanical behavior; Porous scaffold; Robotic deposition; Simulated body fluids; Synthetic scaffolds; Weibull modulus; Bioactive glass; Biological materials; Bone; Deposition; Elastic moduli; Load testing; Repair; Robotics; Compressive strength

International Standard Book Number (ISBN)

978-1118751015; 978-1118751039

International Standard Serial Number (ISSN)

1042-1122

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2013 American Ceramic Society (ACS), All rights reserved.

Publication Date

01 Aug 2013

Link to Full Text

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