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Progress Report on Materials Testing for Anatomically User-Matched Prosthetics

This progress report reviews the project goals for developing low-cost materials for anatomically user-matched prosthetics, focusing on various mold-making processes. Key materials such as wax molds, Kidz EZ Cast mold, and different molding putties are evaluated for their advantages and disadvantages. Interviews with industry expert Charles Mathis provided insights into improving methods for reversible mold creation. Future plans include optimizing materials for hardness and elasticity testing, enhancing the mold-making process, and addressing issues with existing materials.

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Progress Report on Materials Testing for Anatomically User-Matched Prosthetics

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  1. Progress Report: Materials Testing ManoTech Associates Jina Kim Forrest Liau David Lin Teresa Wang

  2. Review of Project Goals • Fulfills two criteria: • Low-cost materials • Anatomically user-matched • Does not include: • Detailed hand aesthetics (color, texture, etc.) • Articulating joints

  3. Progress Overview • Interview with Charles Mathis • “Clay Block” Materials • Reversible Glove Possibilities

  4. The 4-Step Process

  5. Interview with Charles Mathis • ManoTech met Charles last Thursday, 3/9 • Watched and practiced making wax molds

  6. Wax • Advantages • Gives better detail and shape of hand in final mold • little shrinkage • Is relatively easy to use • Allows for mistakes • Disadvantages • Must be maintained at 120 degrees F in a larger pot or deep-fryer

  7. Kidz EZ Cast Mold • Advantages • MoldGel sets in 4 – 5 min. • Works at room temperature • Disadvantages • Lumpy mixture • Water leaks from bottom • Air bubbles reduce detail

  8. 5-Minute Molding Putty • Advantages • Not messy • Takes ~10 minutes to set at room temperature • Disadvantages • Requires significant amount of material • Difficult to mold exactly around the hand and maintain shape

  9. Mini Casting Kit • Advantages • Comes in a kit • Disadvantages • Vapor and powder is toxic • Requires 4 – 8 hours for mold to set around hand • Cannot be used

  10. Gypsum-based Plaster of Paris • Advantages • Cures at room temperature in 1.5 hours • Retains detail of initial mold • Disadvantages • Hardened material is brittle, easily cracked • Transfers bubbles and cracks to solid hand

  11. Brushable Latex • Advantages • Brushes on easily • Reversible • Maintains shape • Able to use leftover latex • Disadvantages • Needs ~10 coats with a 20-minute incubation between coats

  12. RTV Polyurethane • Advantages • Very elastic • Potential to be reversed • Disadvantages • 30-minute pour time • Messy • By dipping, creates non-uniform layer • Dipping twice gave a thin coat that rips

  13. Summary of Materials

  14. Schedule TODAY

  15. Future Plans • Procedures • Improve reversible mold-making method • Materials Optimization • Solid hand mold • Prosthetic • Hardness & Elasticity Testing • Underlayer: silicone rubber • Reversible material: latex, RTV polyurethane

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