Which of the following does not occur in High Copper Amalgam ?

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 are characteristic feature of high copper amalgam alloy ?

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

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

   A. Gamma 1
   B. Gamma 2
   C. Gamma 1 and 2
   D. No phase is eliminated

5. 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

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. 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

9. How soon after a moisture contamination does a zinc containing amalgam alloy start expanding________________?

   A. 24 hours
   B. 1-2 days
   C. 3-5 days
   D. 7 days

10. Which of the following statements about high copper silver alloy compared to conventional alloy is not true ?

    A. It has increased tensile and compressive strength
    B. It has poor tarnish and corrosion resistance
    C. It’s edge strength is greater
    D. Mercury content in the final restoration is less