Dental Ceramics

~ Exam ~

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You must correctly answer 11 of 15 questions. If needed, you may retake the exam. Please complete the evaluation form that will appear on your screen after passing the exam.

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This test has 15 questions.

All questions must be answered before the test can be graded.

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1. Which of the following is not an essential constituent of potter's clay?

  a. Feldspar

  b. Glass

  c. Quartz

  d. Kaolinite

2. Water's main function in clay is to:

  a. Hydrate feldspathic substances.

  b. Breakdown kaolinite into gibbsite and silica.

  c. Reduce friction between clay particles.

  d. Create alkaline metal oxides from non-hydrous fluxes.

3. Sintering means:

  a. Shock cooling of molten glass to make frits.

  b. The molecular bonding of ceramic particles below their melting point.

  c. Melting of non-refractory clay constituents.

4. Which of the following statements is false?

  a. Stoneware is harder than earthenware, because it contains more feldspar.

  b. Earthenware is porous and requires glaze to make vessels waterproof.

  c. Dental porcelains contain no aluminum oxide.

  d. Domestic porcelain is made from short clay.

5. Fluxes in glass:

  a. Are alkaline, metallic oxides.

  b. Disrupt the crystalline structure of silica.

  c. Raise the melting temperature of feldspar.

  d. None of the above.

6. Earthenware clay contains little feldspar glass which binds particles together, and fills pores between sintered alumina and silicon particles

  a. True

  b. False

7. In porcelain, the kaolin causes lack of translucency. By 1938, little or no kaolin was left in porcelains chosen for dental use.

  a. True

  b. False

8. When clay melts at high temperature, it consists of the following constituents:

  a. Feldspathic glass.

  b. Glass from kaolinite.

  c. Refractory alumina and quartz crystals.

  d. All of the above.

9. Quartz is feldspathic.

  a. True

  b. False

10. Refractory particles create a skeletal structure throughout the clay piece helping it to maintain its original shape.

  a. True

  b. False

11. Refractory skeletal structures are made of particles of:

  a. Alumina

  b. Silica

  c. Alumina and silica

  d. All of the above

12. Porcelain clays are very short and difficult to throw.

  a. True

  b. False

13. Issues facing dental ceramics fabrications:

  a. Biocompatibility

  b. Esthetics

  c. Durability

  d. All of the above

14. Tooth structure is harder than porcelain.

  a. True

  b. False

15. A veneer can be bonded to tooth structure or a metal subframe.

  a. True

  b. False