A. Glass ionomer
B. Resin cement
C. Polycarboxylate cement
D. Silico-Phosphate cement
✅ The correct answer is option B. Resin cement.
Dental Materials
In amalgam alloy which acts as oxygen scavenger_____________?
A. Cu
B. Zn
C. Pd
D. Ag
✅ The correct answer is option B. Zn.
In non zinc containing dental amalgam alloy the percentage of zinc present is______________?
A. Less than 0.02%
B. Less than 0.1%
C. Less than 0.01%
D. None of the above
✅ The correct answer is option C. Less than 0.01%.
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 correct answer is option C. 3-5 days.
The tow cements which hold with the tooth are_______________?
A. GIC and polycarboxylate
B. GIC and ZnPO4
C. ZnPO4 and silicate
D. GIC and silicate
✅ The correct answer is option A. GIC and polycarboxylate.
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
✅ The correct answer is option B. It has poor tarnish and corrosion resistance.
Which of the following does not occur in High Copper Amalgam ?
A. Electrochemical Corrosion
B. Chemical Corrosion
C. Penetrating Corrosion
D. Corrosion does not occur at all
✅ The correct answer is option C. Penetrating Corrosion.
Dynamic creep is the______________?
A. Continuing alloying between silver-tin alloy and mercury during the life of restoration
B. Deformation of set amalgam during function
C. Process whereby alloy is wetted by murcury
D. Spread of amalgam during packing
✅ The correct answer is option B. Deformation of set amalgam during function.
Amalgam achieves 70% of the strength by____________?
A. hours
B. 4 hours
C. 8 hours
D. 16 hours
✅ The correct answer is option C. 8 hours.
Minimum thickness for type I zinc phosphate cement should be_______________?
A. 15 microns
B. 25 microns
C. 50 microns
D. 100 microns
✅ The correct answer is option B. 25 microns.