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.Management Sciences
Category: Amalgams
Which of the following phases of dental amalgam has minimum strength____________?
A. Gamma 1
B. Gamma 2
C. Epsilon 1
D. Gamma 3
Which is true regarding lathe cut silver alloy_______________?
A. Requires least amount of mercury
B. Achieves lowest compressive strength at 1 hr.
C. Has tensile strength both at 15 min & 7 days comparable to high copper unicompositional alloy
D. Has low creep
The threshold limit value of mercury exposures is_______________?
A. mg / m3
B. 0.05 mg / m3
C. mg / m3
D. mg / m3
A patient who has had a recent amalgam filling in the upper teeth has a gold filling in the lower teeth, the patient complains of pain. The reason for this can be mainly_____________?
A. Improper amalgam filling
B. Pulp exposure
C. Galvanism
D. None of the above
Moisture contamination of amalgam can lead to_____________?
A. Marginal breakdown
B. Shrinkage
C. Delayed expansion
D. increased stresses
Compare to conventional amalgams, spherical amalgams_______________?
A. Require more mercury
B. Require heavy compection forces
C. Have longer setting times
D. None of the above
The solid solution of silver and mercury is called_______________?
A. y1
B. y2
C. B1
D. y
Increase in the residual mercury in silver amalgam filling can_____________?
A. Cause fracture of the filling
B. Tarnish and corrosion
C. Increase the strength
D. Decrease condensation pressure
Advantage of minimum mercury technique or Eames technique is all Except________________?
A. High strength
B. Sets quickly
C. Needs no squeezing of excess mercury
D. Greater plasticity and adapts well to cavity walls
Advantage of zinc containing amalgam is_______________?
A. Better handling property
B. Dimensional Stability
C. Resistance to creep
D. Toxicity to pulp and dentin
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