The tarnished layer of silver amalgam consists of________________?

Related Mcqs:

1. Increase in the residual mercury in silver amalgam filling can_____________?

   A. Cause fracture of the filling
   B. Tarnish and corrosion
   C. Increase the strength
   D. Decrease condensation pressure

2. Which of the following silver amalgam alloy have the maximum strength________________?

   A. Lathe cut
   B. Spherical
   C. Admixed
   D. Single composition

3. According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be________________?

   A. 80 Mpa
   B. 140 Mpa
   C. 260 Mpa
   D. 510 Mpa

4. The highest mercury concentration in amalgam filling is found_____________?

   A. At the margin of the restoration
   B. In the centre of the restoration
   C. In the deepest part of the restoration
   D. None of the above

5. Advantage of zinc containing amalgam is_______________?

   A. Better handling property
   B. Dimensional Stability
   C. Resistance to creep
   D. Toxicity to pulp and dentin

6. Gallium and indium added to Amalgam replace______________?

   A. Silver
   B. Tin
   C. Mercury
   D. Zinc

7. Co-efficient of Thermal exansion of amalgam is______________?

   A. 6.6 a (ppm k-1)
   B. 11.4 a (ppm k-1)
   C. 14.0 a (ppm k-1)
   D. 25.0 a (ppm k-1)

8. 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

9. What is common in amalgam and ceramics ?

   A. More compressive strength but less tensile strength
   B. More compressive strength and tensile strength
   C. Less compressive strength but more tensile strength
   D. Less compressive strength and tensile strength

10. 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