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.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
4. The addition of platinum to a dental gold alloy results in increased
3. melting point.
4. resistance to corrosion.
A. (1) (2) (3)
B.(1) and (3)
C.(2) and (4)
E. All of the above.
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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.
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6. During the setting phase, a dental stone mixture will exhibit
C. loss in compressive strength.
D. gain in moisture content.
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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.
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.
2. An epinephrine-containing retraction cord has the potential
A. interfering with the setting of the impression material.
B. causing tissue necrosis.
C. producing a systemic reaction.
D. discoloring gingival tissue
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1. The purpose of a temporary restoration in an anterior tooth
A. maintain aesthetics.
B. protect dentin and pulp.
C. prevent gingival inflammation and recession.
D. prevent tooth movement.
E. All of the above.
2. The polymerization of methyl methacrylate is
Applied dental materials P 196
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