A. High Bisque stage
B. Low Bisque stage
C. Medium Bisque stage
D. Fusion stage
✅ The correct answer is option C. Medium Bisque stage.
Dental Materials
Which of the following phases of dental amalgam has minimum strength____________?
A. Gamma 1
B. Gamma 2
C. Epsilon 1
D. Gamma 3
✅ The correct answer is option B. Gamma 2.
In spherical alloys as compared to lathe cut____________?
A. Less condensing force is required
B. More condensing force is required
C. Both require same condensing force
D. Manipulation is easy
✅ The correct answer is option A. Less condensing force is required.
Amalgam means_____________?
A. A metallic powder composed of silver, tin, copper and zinc
B. An alloy of two or more metals one of which is mercury
C. An alloy of two or more metals that have been dissolved in each other in the molten state
D. A metallic substances in powder or tablet from that is mixed with mercury
✅ The correct answer is option B. An alloy of two or more metals one of which is mercury.
Porcelain denture teeth________________?
A. Have a higher coefficient of thermal expansion than acrylic teeth:
B. Have a lower abrasion resistance than enamel
C. Should be used where the inter dental clearance is small
D. Have a higher abrasion resistance than gold
✅ The correct answer is option D. Have a higher abrasion resistance than gold.
The addition of which of the following can accelerate the setting time of zinc oxide cement_____________?
A. Zinc acetate
B. Barium sulphate
C. Zinc sulphate
D. Barium chloride
✅ The correct answer is option A. Zinc acetate.
PH of which cement remain below 7 even after 1 month after insertion into the cavity ?
A. Glass Ionomer Cement
B. Zinc Phosphate
C. Resin cement
D. Silicate cement
✅ The correct answer is option D. Silicate cement.
Which is not true about high copper amalgam alloys______________?
A. Low tensile and compressive strength
B. Low Hg: Alloy ratio
C. High tensile strength
D. Low creep
✅ The correct answer is option A. Low tensile and compressive strength.
Porosity in porcelain at condensation stage depends on_________________?
A. Shape and size of particle
B. Uniform distribution of particle size
C. Number of particles
D. None of the above
✅ The correct answer is option A. Shape and size of particle.
Greening occuring when porcelains are fired on silver free alloys may be attributed to________________?
A. Vaporization of silver from the walls of contaminated furnaces
B. Surface diffusion of silver from the marginal metal
C. More rapid silver diffusion in sodium containing glass
D. Silver ionization by porcelains with high oxygen potential
✅ The correct answer is option A. Vaporization of silver from the walls of contaminated furnaces.