What is the working time of amalgam?

Related Mcqs:

1. 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

2. Well premeasured capsules of amalgam can release mercury vapour during_______________?

   A. Mulling
   B. Carving
   C. Condensation
   D. Trituration

3. 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

4. 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

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. Cavo surface angle for amalgam resoration is butt joint as____________?

   A. It increases compresssive and tensile strengths
   B. Decreased compressive, increased strength
   C. Decreased compressive, decrease tensile strength
   D. Increased compressive, increased tensile strength

7. Amalgam achieves 70% of the strength by____________?

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

8. 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

9. What is the recommended for condensation of dental amalgam ?

   A. 35 pounds
   B. 3 pounds
   C. 15 lb
   D. 25 lb

10. Setting time of Amalgam is best controlled by _______________?

    A. Using spherical particles
    B. Lathe cut alloy
    C. Altering Hg-Alloy ratio
    D. Trituration time