Practice Test Geeks(CPT) Certified Prosthetic Technician Practice Test
← All CPT Flashcard Decks

Materials, Tools, & Safety in Prosthetics Flashcards

7 cards from real CPT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Materials, Tools, & Safety in Prosthetics flashcards as text

  1. Which property of carbon fiber composites makes them preferred over aluminum for high-activity prosthetic feet?

    Answer: Higher energy return and lower weight

    Carbon fiber stores and releases mechanical energy during gait while being significantly lighter than aluminum, improving functional outcomes.

  2. What does Shore hardness measure in the context of prosthetic materials?

    Answer: Resistance to permanent indentation

    Shore hardness quantifies a material's resistance to surface indentation, helping technicians select appropriate liner and padding materials.

  3. A technician is mixing two-part urethane foam. Which hazard requires IMMEDIATE attention if the mixture begins to expand faster than expected?

    Answer: Inhalation of exothermic vapors

    Rapid exothermic expansion generates heat and releases isocyanate vapors, which are respiratory sensitizers requiring immediate ventilation and respirator use.

  4. When drilling through carbon fiber laminate, which drill bit type is recommended to minimize delamination?

    Answer: Diamond-coated bit

    Diamond-coated bits cut through carbon fiber cleanly without creating the fraying or delamination that standard metal drill bits cause.

  5. Which material property is described as the ratio of stress to strain in the elastic region of a material?

    Answer: Young's modulus

    Young's modulus (elastic modulus) describes material stiffness—how much a material resists deformation under load before permanent change occurs.

  6. What is the correct disposal method for resin-contaminated gloves and mixing cups in a prosthetics lab?

    Answer: Disposal as hazardous waste per local regulations

    Uncured resin and resin-contaminated materials are classified as hazardous waste and must be disposed of according to local and federal regulations.

  7. Which lamination layup sequence provides the greatest torsional rigidity for a transfemoral socket?

    Answer: ±45° carbon fiber outer with 90° inner

    Placing carbon fiber layers at ±45° to the principal axis maximizes resistance to twisting forces encountered during ambulation.