In amalgam alloy which acts as oxygen scavenger_____________?
A. Cu
B. Zn
C. Pd
D. Ag
Amalgams
By increasing the percentage of which metal, the strength and hardness of amalgam increases_____________?
By increasing the percentage of which metal, the strength and hardness of amalgam increases_____________?
A. Ag
B. Zn
C. Cu
D. Hg
Which of the following statement is true regarding lathe cut low Copper silver alloy ?
Which of the following statement is true regarding lathe cut low Copper silver alloy ?
A. Requires least amount of mercury
B. Achieves high compressive strength at 1 hr.
C. Has tensile strength both at 15 minutes and 7 days is comparable to high copper, unicompositional alloys
D. Has lower cree value
Creep value of which of the following is the highest ?
Creep value of which of the following is the highest ?
A. Low copper amalgam alloy
B. Admix alloy
C. Single composition alloys
D. Creep value of all the above mentioned alloys is same
Amalgam achieves 70% of the strength by____________?
Amalgam achieves 70% of the strength by____________?
A. hours
B. 4 hours
C. 8 hours
D. 16 hours
Mercury is toxic because it_____________?
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
What fraction of inhaled mercury vapors retained in the body ?
What fraction of inhaled mercury vapors retained in the body ?
A. 45-55%
B. 55-65%
C. 65-85%
D. More than 85%
The effect of trituration on strength in an amalgam restoration depends on______________?
The effect of trituration on strength in an amalgam restoration depends on______________?
A. Amalgam alloy
B. Trituration time
C. Speed of amalgamator
D. All of the above
Decrease in creep occurs in_______________?
Decrease in creep occurs in_______________?
A. Under trituration or over trituration of amalgam
B. Decreases with condensation pressure
C. Increase with condensation pressure
D. Cannot be predictable
Cavo surface angle for amalgam resoration is butt joint as____________?
Cavo surface angle for amalgam resoration is butt joint as____________?
A. It increases compresssive and tensile strengths
B. Decreased compressive, increased strength
C. Decreased compressive, decrease tensile strength
D. Increased compressive, increased tensile strength