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.Management Sciences
Category: Amalgams
Which phase provides maximum strength in hardened mercury/silver alloy ?
A. Silver / Mercury phase
B. Silver / Tin phase
C. Tin / Mercury phase
D. Zinc / Mercury phase
In a high copper amalgam the phase, which is eliminated is_______________?
A. Gamma 1
B. Gamma 2
C. Gamma 1 and 2
D. No phase is eliminated
Once triturated, the Dental amalgam should be condensed with in_____________?
A. 5 minutes
B. 6 minutes
C. 3 minutes
D. 15 minutes
Adequate mixing of mercury is indicated by_______________?
A. Dry Mix
B. Shiny Mix
C. Short Mixing Time
D. None of the above
The higher the Hg alloy ratio in dental amalgam________________?
A. Higher the strength
B. Lower the creep value
C. More matrix matrial formed
D. More gamma 1 phase formed
What is the recommended for condensation of dental amalgam ?
A. 35 pounds
B. 3 pounds
C. 15 lb
D. 25 lb
Co-efficient of Thermal exansion of amalgam is______________?
A. 6.6 a (ppm k-1)
B. 11.4 a (ppm k-1)
C. 14.0 a (ppm k-1)
D. 25.0 a (ppm k-1)
Gallium and indium added to Amalgam replace______________?
A. Silver
B. Tin
C. Mercury
D. Zinc
Mercury is toxic because it_____________?
A. Complexes with hemoglobinto form methemoglobin
B. Inhibits hemoglobin synthesis, producing anemia
C. Inhibits anaerobic glycolysis
D. Binds to sulfhydryl groups
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