The tarnished layer of silver amalgam consists of________________?
A. Sulphides of silver
B. Oxides of tin
C. Chlorides of tin
D. All of the above
Amalgams
Which phase provides maximum strength in hardened mercury/silver alloy ?
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
Copper content in low copper amalgam is________________?
Copper content in low copper amalgam is________________?
A. 6%
B. 12-30%
C. 29%
D. 19%
Which of the following silver amalgam alloy have the maximum strength________________?
Which of the following silver amalgam alloy have the maximum strength________________?
A. Lathe cut
B. Spherical
C. Admixed
D. Single composition
What is the most frequently used restorative material ?
What is the most frequently used restorative material ?
A. Silicate
B. Amalgam
C. Composite
D. Gold
How soon after a moisture contamination does a zinc containing amalgam alloy start expanding________________?
How soon after a moisture contamination does a zinc containing amalgam alloy start expanding________________?
A. 24 hours
B. 1-2 days
C. 3-5 days
D. 7 days
The percentage of copper in high copper alloy is______________?
The percentage of copper in high copper alloy is______________?
A. 10-12%
B. 0-6%
C. 13-30%
D. 20-30%
What is the working time of amalgam?
What is the working time of amalgam?
A. One to two minutes
B. Three to four minutes
C. Five to six minutes
D. Seven to eight minutes
Advantage of zinc containing amalgam is_______________?
Advantage of zinc containing amalgam is_______________?
A. Better handling property
B. Dimensional Stability
C. Resistance to creep
D. Toxicity to pulp and dentin
Discolouration of silver alloy is due to_____________?
Discolouration of silver alloy is due to_____________?
A. Tarnish
B. Tarnish and corrosion
C. Wet corrosion
D. Dry corrosion