Moisture contamination of amalgam can lead to_____________?
A. Marginal breakdown
B. Shrinkage
C. Delayed expansion
D. increased stresses
Amalgams
In a high copper amalgam the phase, which is eliminated is_______________?
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
Well premeasured capsules of amalgam can release mercury vapour during_______________?
Well premeasured capsules of amalgam can release mercury vapour during_______________?
A. Mulling
B. Carving
C. Condensation
D. Trituration
In spherical alloys as compared to lathe cut____________?
In spherical alloys as compared to lathe cut____________?
A. Less condensing force is required
B. More condensing force is required
C. Both require same condensing force
D. Manipulation is easy
Chronic mercury toxicity results from_____________?
Chronic mercury toxicity results from_____________?
A. Ingestion while removing old amalgam
B. Skin contact
C. Mercury vapour
D. All of the above
Increase in the residual mercury in silver amalgam filling can_____________?
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
Which of the following statements about high copper silver alloy compared to conventional alloy is not true ?
Which of the following statements about high copper silver alloy compared to conventional alloy is not true ?
A. It has increased tensile and compressive strength
B. It has poor tarnish and corrosion resistance
C. It’s edge strength is greater
D. Mercury content in the final restoration is less
Compare to conventional amalgams, spherical amalgams_______________?
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
Which of the following phases of dental amalgam has minimum strength____________?
Which of the following phases of dental amalgam has minimum strength____________?
A. Gamma 1
B. Gamma 2
C. Epsilon 1
D. Gamma 3
The ADA specification No 1 for composition of amalgam alloy recommends______________?
The ADA specification No 1 for composition of amalgam alloy recommends______________?
A. 65% silver, 32% tin and 3% copper
B. 49% silver, 32% tin and 19% cooper
C. 65% silver, 29% tin and 5-6% copper
D. None of the above