In a high copper amalgam the phase, which is eliminated is_______________?

Related Mcqs:

1. Copper content in low copper amalgam is________________?

   A. 6%
   B. 12-30%
   C. 29%
   D. 19%

2. High copper dental amalgams are superior to other amalgams because high copper dental amalgems______________?

   A. Have less marginal breakdown
   B. Are workable at lower Hg-alloy ratio
   C. Have a higher ratio of tensile to compressive strength
   D. Have less resistance to tarnish and corrosion

3. 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

4. High copper amalgam can be produced_____________?

   A. From smooth atomized particles
   B. From irregular and spherical particles
   C. From lathe cut particles
   D. From traditional alloy particles

5. Which of the following are characteristic feature of high copper amalgam alloy ?

   A. Low compressive strength
   B. High marginal breakdown
   C. Less marginal #
   D. High creep

6. 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

7. The percentage of copper in high copper alloy is______________?

   A. 10-12%
   B. 0-6%
   C. 13-30%
   D. 20-30%

8. Advantage of zinc containing amalgam is_______________?

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

9. Amalgam restorations give the best clinical service when the residual mercury content is_______________?

   A. 38-42%
   B. 48-52%
   C. 58-62%
   D. 68-72%

10. High strength amalgam is achieved by_____________?

    A. Maximum matrix and minimum alloy phase
    B. Minimum matrix and maximum alloy phase
    C. Maximum matrix phase
    D. Minimum alloy phase