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Potential Bone Replacement Materials Prepared by Two Methods

Published online by Cambridge University Press:  30 March 2012

Steve Lee
Affiliation:
University of California, San Diego, Materials Science and Engineering Program, 9500 Gilman Dr., La Jolla, CA 92093 USA
Michael Porter
Affiliation:
University of California, San Diego, Materials Science and Engineering Program, 9500 Gilman Dr., La Jolla, CA 92093 USA
Scott Wasko
Affiliation:
University of California, San Diego, Skaggs School of Pharmacy, 9500 Gilman Dr., La Jolla, CA 92093 USA
Grace Lau
Affiliation:
Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, CA 94720 USA
Po-Yu Chen
Affiliation:
National Tsing Hua University, Department of Materials Science and Engineering, Hsinchu 30013, Taiwan, R.O.C.
Ekaterina E. Novitskaya
Affiliation:
University of California, San Diego, Materials Science and Engineering Program, 9500 Gilman Dr., La Jolla, CA 92093 USA
Antoni P. Tomsia
Affiliation:
Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, CA 94720 USA
Adah Almutairi
Affiliation:
University of California, San Diego, Skaggs School of Pharmacy, 9500 Gilman Dr., La Jolla, CA 92093 USA
Marc A. Meyers
Affiliation:
University of California, San Diego, Materials Science and Engineering Program, 9500 Gilman Dr., La Jolla, CA 92093 USA University of California, San Diego, Dept. of Mechanical and Aerospace Engineering, 9500 Gilman Dr., La Jolla, CA 92093 USA
Joanna McKittrick
Affiliation:
University of California, San Diego, Materials Science and Engineering Program, 9500 Gilman Dr., La Jolla, CA 92093 USA University of California, San Diego, Dept. of Mechanical and Aerospace Engineering, 9500 Gilman Dr., La Jolla, CA 92093 USA
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Abstract

Natural and synthetic hydroxyapatite (HA) scaffolds for potential load-bearing bone implants were fabricated by two methods. The natural scaffolds were formed by heating bovine cancellous bone at 1325°C, which removed the organic and sintered the HA. The synthetic scaffolds were prepared by freeze-casting HA powders, using different solid loadings (20–35 vol.%) and cooling rates (1–10°C/min). Both types of scaffolds were infiltrated with polymethylmethacrylate (PMMA). The porosity, pore size, and compressive mechanical properties of the natural and synthetic scaffolds were investigated and compared to that of natural cortical and cancellous bone. Prior to infiltration, the sintered cancellous scaffolds exhibited pore sizes of 100 – 300 μm, a strength of 0.4 – 9.7 MPa, and a Young’s modulus of 0.1 – 1.2 GPa. The freeze-casted scaffolds had pore sizes of 10 – 50 μm, strengths of 0.7 – 95.1 MPa, and Young’s moduli of 0.1 –19.2 GPa. When infiltrated with PMMA, the cancellous bone- PMMA composite showed a strength of 55 MPa and a Young’s modulus of 4.5 GPa. Preliminary data for the synthetic HA-PMMA composite showed a strength of 42 MPa and a modulus of 0.8 GPa.

Type
Research Article
Copyright
Copyright © Materials Research Society 2012

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