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Precision Extruding Deposition for Freeform Fabrication of PCL and PCL-HA Tissue Scaffolds

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Printed Biomaterials

Part of the book series: Biological and Medical Physics, Biomedical Engineering ((BIOMEDICAL))

Abstract

Computer-aided tissue engineering approach was used to develop a novel Precision Extrusion Deposition (PED) process to directly fabricate Polycaprolactone (PCL) and composite PCL/Hydroxyapatite (PCL-HA) tissue scaffolds. The process optimization was carried out to fabricate both PCL and PCL-HA (25% concentration by weight of HA) with a controlled pore size and internal pore structure of the 0°/90° pattern. Two groups of scaffolds having 60 and 70% porosity and with pore sizes of 450 and 750 microns, respectively, were evaluated for their morphology and compressive properties using Scanning Electron Microscopy (SEM) and mechanical testing. The surface modification with plasma was conducted on PCL scaffold to increase the cellular attachment and proliferation. Our results suggested that inclusion of HA significantly increased the compressive modulus from 59 to 84 MPa for 60% porous scaffolds and from 30 to 76 MPa for 70% porous scaffolds. In vitro cell–scaffolds interaction study was carried out using primary fetal bovine osteoblasts to assess the feasibility of scaffolds for bone tissue engineering application. In addition, the results in surface hydrophilicity and roughness show that plasma surface modification can increase the hydrophilicity while introducing the nano-scale surface roughness on PCL surface. The cell proliferation and differentiation were calculated by Alamar Blue assay and by determining alkaline phosphatase activity. The osteoblasts were able to migrate and proliferate over the cultured time for both PCL as well as PCL-HA scaffolds. Our study demonstrated the viability of the PED process to the fabricate PCL and PCL-HA composite scaffolds having necessary mechanical property, structural integrity, controlled pore size and pore interconnectivity desired for bone tissue engineering.

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Acknowledgment

Support from the National Science Foundation Grant No. 235342 “Computer-Aided Tissue Engineering” to this research is acknowledged.

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Authors and Affiliations

  1. Laboratory for Computer-Aided Tissue Engineering, Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA, 19104, USA

    L. Shor, E. D. Yildirim, S. Güçeri & W. Sun

Authors
  1. L. Shor
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  2. E. D. Yildirim
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  3. S. Güçeri
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  4. W. Sun
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Corresponding author

Correspondence to W. Sun .

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Editors and Affiliations

  1. Chapel Hill, University of North Carolina,, MacNider Hall, Chapel Hill, 27599-7575, U.S.A.

    Roger Narayan

  2. Biomedical Engineering Program, University of Texas, El Paso, W. University Ave 500, El Paso, 79968, U.S.A.

    Thomas Boland

  3. Edward P. Fitts Dept. Industrial &, North Carolina State University, Daniels Hall 400, Raleigh, 27695, U.S.A.

    Yuan-Shin Lee

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Shor, L., Yildirim, E.D., Güçeri, S., Sun, W. (2010). Precision Extruding Deposition for Freeform Fabrication of PCL and PCL-HA Tissue Scaffolds. In: Narayan, R., Boland, T., Lee, YS. (eds) Printed Biomaterials. Biological and Medical Physics, Biomedical Engineering. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-1395-1_6

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