Dental Alloys

~ Exam ~

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This test has 10 questions.

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1. The first centrifugal casting machine was invented
  a. In 1723 by Pierre Fauchard

  b. In 1855 by Giovanni d'Arcoli
  c. In 1895 by G.V, Black
  d. In 1907 by William H. Taggart

2. Which of the following statements is true?
  a. A crystal is made up of many grains
  b. A grain is made up of many crystals
  c. A metal with small grains is harder than one with large grains
  d. A metal with large grains is harder than one with small grains

3. Pure gold is soft because
  a. Its grain structure contains many edge dislocations
  b. Gold has a low melting temperature which causes cubic crystals to soften
  c. It has a low elastic deformation strength
  d. d. Perfect gold crystals are especially malleable

4. Wrought wire is springy and hard because
  a. It is heat treated
  b. It has an especially large crystalline structure
  c. It has especially small grains
  d. It has been cold forged

5. Which of the following is NOT a method of hardening metallic objects?
  a. Force the formation of small grains

  b. Allow longer cooling times to allow the formation of larger grains
  c. Applying shear forces across the crystalline lattice
  d. Contaminating the crystalline lattice with foreign atoms

6. The most commonly used type of gold ally in the fabrication of all-gold restorations is
  a. Type I
  b. Type II
  c. Type III
  d. Type IV

7. What must be present in a metallic substructure in order for porcelain to adhere?
  a. Diatoric retention
  b. Palladium
  c. Metallic oxides presenting on the surface
  d. Ruthenium, Iridium or Rhenium to act as grain formers

8. Noble metals contain

  a. At least 60% noble metals
  b. At least 25% noble metals
  c. At least 35% gold
  d. Gold, palladium and platinum only

9. Base metal alloys
  a. Have twice the hardness and elasticity of noble and high noble alloys
  b. Offer poor sag resistance
  c. Have a low casting shrinkage
  d. Are used today mostly for fixed partial dentures

10. The metal used in trace amounts as an oxygen scavenger is
  a. Gallium
  b. Tin
  c. Cobalt
  d. Zinc