Untitled Flashcard Set

  1. What are the main advantages of the combination of porcelain and metal for fixed crown and bridge prosthodontics?
    Answer: Strength from the metal + esthetics from the porcelain.

  2. The metals used as the core for PFM crowns are alloys that will form a (an) ____________ layer as the metal is heated.
    Answer: Oxide layer.

  3. The first layer of porcelain applied to the metal during fabrication of porcelain-metal restorations is known as the ____________.
    Answer: Opaque layer.

  4. The best arrangement for the coefficient of thermal expansion between porcelain and metal is for the porcelain to have ____________ thermal expansion than the metal.
    Answer: Slightly lower.

  5. Computer-assisted machining for crown and bridge techniques does not require that dies be poured or a temporary made.
    A. True   B. False
    Answer: A. True

  6. When should a shade of a tooth be taken?
    Answer: Before tooth preparation, with the tooth hydrated and in natural/neutral lighting.

  7. Shade tabs should be moistened and held adjacent to the teeth to be matched.
    A. True   B. False
    Answer: A. True

  8. ____________ is the fusion of ceramic particles at their borders by heating them to the point of beginning to melt.
    Answer: Sintering.

  9. A CAD/CAM machined crown uses an optical scanner to ____________.
    A. design the crown
    B. make the temporary
    C. make the impressions (digital images)
    D. design the prep
    Answer: C. make the impressions (digital images)

  10. Noble dental casting alloys do not require any gold but must contain at least 25% noble metals by weight.
    A. True   B. False
    Answer: A. True

  11. One of the noble metals used for dental casting alloys is platinum.
    A. True   B. False
    Answer: A. True

  12. Chromium is a base metal with the highest incidence of allergic response.
    A. True   B. False
    Answer: B. False (Nickel has the highest).

  13. ____________ is used when gold castings are soldered to remove surface oxides so the solder can flow freely.
    Answer: Flux.

  14. Which metal is added to gold and silver solders to lower the melting range?
    Answer: Tin.

  15. What are silver-based solders primarily used for in dentistry?
    Answer: Joining or repairing metal components (frameworks, appliances).

  16. What is dental wrought wire primarily used for in dentistry?
    Answer: Orthodontic wires, clasps, splints, and appliance components.

  17. Why would zinc be added to a base-metal mixture?
    A. Makes it stronger
    B. Reduces oxidation when the alloy is cast
    C. Decreases solubility
    D. Provides luster
    Answer: B. Reduces oxidation when the alloy is cast

Gold Karat Calculations

  1. 24 Karat =
    Answer: 100% gold

  2. 12 Karat =
    Answer: 50% gold

Matching

  1. _____ Alloy composed of non-noble metals
    Answer: B. Base-metal alloy

  2. _____ A solid compound made of two or more elements, one of which is a metal
    Answer: A. Alloy

  3. _____ Alloy containing at least 60% noble metals, 40% of which must be gold
    Answer: D. High-noble metal

  4. _____ Classification of metal based on its high cost
    Answer: E. Precious metal

  5. _____ Alloy composed of metals that do not corrode readily; at least 25% must be noble metals
    Answer: C. Noble alloy