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Fast Casters – Project Update February 16, 2006

Fast Casters – Project Update February 16, 2006. Rene Chen Byron Hsu Kimberly Kam Kelsey Vandermeulen Lisa Witmer. Objectives. Progress since last update New project candidates Technology of speed skate blade 3-D printing of bone scaffolding.

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Fast Casters – Project Update February 16, 2006

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  1. Fast Casters – Project UpdateFebruary 16, 2006 Rene Chen Byron Hsu Kimberly Kam Kelsey Vandermeulen Lisa Witmer

  2. Objectives • Progress since last update • New project candidates • Technology of speed skate blade • 3-D printing of bone scaffolding

  3. Important Material Characteristics in Speed Skates • Strong, resistant to wear • Low thermal conductivity • Able to be sharpened

  4. Titanium vs. Steel Blade + Increased durability + Needs to be sharpened less often - Sharpening takes time and may dull the tools

  5. Challenges • Analyzing advantages and difficulties of using a titanium blade • Analyzing advantages of casting over forging or water jet cutting • Finishing the blade

  6. 3D Printing of Hydroxyapatite Bone Scaffolds • Objective • 3D porous hydroxyapatite scaffold for bone replacement customized from patient’s CT scans Seitz et al, Wiley Periodicals

  7. CAD image of bone replacement CT scan from patient Surgeons implant customized scaffold into patient Bone scaffold fabricated from 3D printer The Process

  8. Requirements of HA Bone Scaffolds • Porosity • Strength • Interconnected channels • Channel size • Biocompatibility • Bone ingrowth Seitz et al, Wiley Periodicals

  9. Hydroxyapatite • Ca10(PO4)6(OH)2 • Chemically similar to the component of bones • Supports bone ingrowth • Biodegrades in the body over time • HA in powder form

  10. Why HA Bone Scaffolds Would Benefit from 3D Printing • Rapid prototyping • Quick customization using CT scan of patient • Complexity of scaffold Leukers et al, Journal of Mat. Sci.

  11. Challenges of 3D Printing Hydroxyapatite Scaffolds • HA particle size • Acceptable binder • polymeric • Small enough size resolution • Time constraints • Sintering • Shrinkage • Cell culture

  12. The Game Plan • Explore different combinations of hydroxyapatite and biocompatible materials • Uniaxial tension/compression tests • SEM imaging of microstructure • Different channel geometries

  13. Questions/Comments?

  14. Backup/Extra Information

  15. Material Candidates Spray-dried hydroxyapatite granulates with polymeric additives V5.2 and V12 Polymeric binder Schelofix dissolved in water (10 and 14wt%) • Hermann Seitz, “Three-Dimensional Printing of Porous Ceramic Scaffolds for Bone Tissue Engineering”, Wiley Periodicals, 2005.

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