Moh operative

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Moh operative

  1. 1. Page 207 1.In minimizing the firing shrinkage of porcelain, the principal factor is the  A. fusion temperature.  B. ratio of flux to feldspar.  C. uniformity of particle size.  D. thoroughness of condensation.
  2. 2. 2.The higher modulus of elasticity of a chromium-cobalt-nickel alloy, compared to a Type IV gold alloy, means that chromium- cobalt-nickel partial denture clasp will require  A. a heavier cross section for a clasp arm.  B. a shorter retentive arm.  C. more taper.  D. a shallower undercut. Applied dental materials p 75
  3. 3. 4. The addition of platinum to a dental gold alloy results in increased  1. strength.  2. hardness.  3. melting point.  4. resistance to corrosion. A. (1) (2) (3) B.(1) and (3) C.(2) and (4) D.(4) only E. All of the above. Applied Dental Material page 153
  4. 4. 5.The main purpose of flux in soldering is to  A. dissolve surface oxides and prevent further oxidation.  B. prevent recrystallization and grain growth.  C. prevent oxidation and lower the melting range of the solder.  D. dissolve surface oxides and lower the melting range. Applied Dental Material page 79
  5. 5. 6. During the setting phase, a dental stone mixture will exhibit  A expansion.  B contraction.  C. loss in compressive strength.  D. gain in moisture content. Applied Dental Material page 46
  6. 6. 7. Zinc-oxide-eugenol cements are  A. less soluble than zinc phosphate cements.  B. more soluble than zinc phosphate cements.  C. as soluble as zinc phosphate cements.  D. less soluble than glass ionomer cements.
  7. 7. Page 208 1.To ensure the greatest accuracy, rubber base impressions should be poured  A. within 10 minutes.  B. within 1 hour.  C. within 8 hours.  D. after 24 hours.
  8. 8. 2. An epinephrine-containing retraction cord has the potential of  A. interfering with the setting of the impression material.  B. causing tissue necrosis.  C. producing a systemic reaction.  D. discoloring gingival tissue Applied materials P144
  9. 9. Page 209 1. The purpose of a temporary restoration in an anterior tooth is to  A. maintain aesthetics.  B. protect dentin and pulp.  C. prevent gingival inflammation and recession.  D. prevent tooth movement.  E. All of the above.
  10. 10. 2. The polymerization of methyl methacrylate is  A. endothermic.  B hydrophilic.  C hydrolytic.  D. exothermic. Applied dental materials P 196
  11. 11. 4.Alginate hydrocolloids  A. shrink when stored in air.  B. show syneresis.  C. expand when stored in water.  D. All of the above. Applied Dental Material page 161

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