Setting time of Amalgam is best controlled by _______________?

Related Mcqs:

1. Mercury rich condition in a slow setting amalgam alloy system in a resoration in______________?

   A. Accelerated corrosion
   B. Fracture of the restoration
   C. Merginal damage
   D. All of the above

2. Setting time of ZOE is best controlled by______________?

   A. Adding a drop of eugenol
   B. Adding a drop of water
   C. Cooling the glass slab
   D. Altering ratio of two pastes

3. The ADA specification No 1 for composition of amalgam alloy recommends______________?

   A. 65% silver, 32% tin and 3% copper
   B. 49% silver, 32% tin and 19% cooper
   C. 65% silver, 29% tin and 5-6% copper
   D. None of the above

4. The tarnished layer of silver amalgam consists of________________?

   A. Sulphides of silver
   B. Oxides of tin
   C. Chlorides of tin
   D. All of the above

5. Once triturated, the Dental amalgam should be condensed with in_____________?

   A. 5 minutes
   B. 6 minutes
   C. 3 minutes
   D. 15 minutes

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 achieves 70% of the strength by____________?

   A. hours
   B. 4 hours
   C. 8 hours
   D. 16 hours

9. 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

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