A. Polyacrylic acid is liquid
B. Chemical bond to tooth structure
C. Chelation
D. Substitution o eugenol by EBA to increase strength of cement
✅ The correct answer is option C. Chelation.
Dental Materials
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
✅ The correct answer is option B. Coat the alloy particle with mercury.
Which of the following constituents of amalgam alloy decreases expansion____________?
A. Copper
B. Zinc
C. Silver
D. Tin
✅ The correct answer is option D. Tin.
The setting time of ZnPO4 cement can be retarded by_____________?
A. mixing more powder to the liquid
B. mixing powder to liquid, checked by water
C. slower addition of powder to liquid
D. faster addition of powder to liquid
✅ The correct answer is option C. slower addition of powder to liquid.
By increasing the percentage of which metal, the strength and hardness of amalgam increases_____________?
A. Ag
B. Zn
C. Cu
D. Hg
✅ The correct answer is option C. Cu.
Absorption of mercury in the human body occurs least from_____________?
A. Lungs
B. Gastro-intestinal Track
C. Skin
D. Kidneys
✅ The correct answer is option D. Kidneys.
Which cement is irritating to the pulp ?
A. Carboxylate cement
B. Zinc oxide-eugenol cement
C. Zinc phosphate
D. Ethoxybenzoic acid
✅ The correct answer is option C. Zinc phosphate.
Which of the following silver amalgam alloy have the maximum strength________________?
A. Lathe cut
B. Spherical
C. Admixed
D. Single composition
✅ The correct answer is option D. Single composition.
Age hardening is a process done at______________?
A. Heating up to 200 – 450°C for 15 – 30 min and quenching in water
B. Heating at 700°C for 10 – 15 min and quenching in water
C. Heating at 700°C for 1 hour and quenching in water
D. Heating above 700°C for 30 min and quenching in water
✅ The correct answer is option A. Heating up to 200 – 450°C for 15 – 30 min and quenching in water.
The major component of zinc phosphate cement is_____________?
A. Zinc oxide
B. Phosphoric acid
C. Zinc
D. None of the above
✅ The correct answer is option A. Zinc oxide.