Compare to conventional amalgams, spherical amalgams_______________?

Related Mcqs:

1. 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

2. 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

3. In spherical alloys as compared to lathe cut____________?

   A. Less condensing force is required
   B. More condensing force is required
   C. Both require same condensing force
   D. Manipulation is easy

4. The term trituration means____________?

   A. Lysing amalgam alloy
   B. Mixing of amalgam alloy and mercury
   C. Removal of excess of mercury
   D. None of the above

5. What is the working time of amalgam?

   A. One to two minutes
   B. Three to four minutes
   C. Five to six minutes
   D. Seven to eight minutes

6. The solid solution of silver and mercury is called_______________?

   A. y1
   B. y2
   C. B1
   D. y

7. Which is true regarding lathe cut silver alloy_______________?

   A. Requires least amount of mercury
   B. Achieves lowest compressive strength at 1 hr.
   C. Has tensile strength both at 15 min & 7 days comparable to high copper unicompositional alloy
   D. Has low creep

8. 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)

9. Mercury is toxic because it_____________?

   A. Complexes with hemoglobinto form methemoglobin
   B. Inhibits hemoglobin synthesis, producing anemia
   C. Inhibits anaerobic glycolysis
   D. Binds to sulfhydryl groups

10. 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