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.Management Sciences
Category: Amalgams
Cause of expansion in zinc containing amalgam is_____________?
A. Zinc and water
B. Water
C. Hydrogen
D. Nascent oxygen
Setting time of Amalgam is best controlled by _______________?
A. Using spherical particles
B. Lathe cut alloy
C. Altering Hg-Alloy ratio
D. Trituration time
Over-trituration of silver alloy and mercury_______________?
A. Reduces contraction
B. Increases the strength of lathe cut alloy but reduces the strength of spherical alloy amalgam
C. Decreases creep
D. Gives al dull and crumbly amalgam
What is the most frequently used restorative material ?
A. Silicate
B. Amalgam
C. Composite
D. Gold
Amalgam restorations give the best clinical service when the residual mercury content is_______________?
A. 38-42%
B. 48-52%
C. 58-62%
D. 68-72%
Absorption of mercury in the human body occurs least from_____________?
A. Lungs
B. Gastro-intestinal Track
C. Skin
D. Kidneys
Ag-Cu eutectic alloy has a characteristic Property of that fusion temp of_____________?
A. The resultant alloy is greater
B. The resultant alloy is lesser
C. The resultant alloy varies according to the content of Ag of Cu
D. None of the above
In amalgam alloy which acts as oxygen scavenger_____________?
A. Cu
B. Zn
C. Pd
D. Ag
Discolouration of silver alloy is due to_____________?
A. Tarnish
B. Tarnish and corrosion
C. Wet corrosion
D. Dry corrosion
During amalgamation, trituration is done to_____________?
A. Dissolve the alloy in mercury
B. Coat the alloy particle with mercury
C. Remove excess mercury from the amalgam
D. Dissolve Hg in alloy
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