Over-trituration of silver alloy and mercury_______________?

Related Mcqs:

1. 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

2. Discolouration of silver alloy is due to_____________?

   A. Tarnish
   B. Tarnish and corrosion
   C. Wet corrosion
   D. Dry corrosion

3. Which of the following silver amalgam alloy have the maximum strength________________?

   A. Lathe cut
   B. Spherical
   C. Admixed
   D. Single composition

4. Which phase provides maximum strength in hardened mercury/silver alloy ?

   A. Silver / Mercury phase
   B. Silver / Tin phase
   C. Tin / Mercury phase
   D. Zinc / Mercury phase

5. Which of the following statement is true regarding lathe cut low Copper silver alloy ?

   A. Requires least amount of mercury
   B. Achieves high compressive strength at 1 hr.
   C. Has tensile strength both at 15 minutes and 7 days is comparable to high copper, unicompositional alloys
   D. Has lower cree value

6. 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

7. Which one of the following is not an objective of trituration ?

   A. Remove oxides from powder particle surface
   B. Keep the amount of gamma-1 or gamma-2 matrix crystals to maximum
   C. Pulverize pelletes into particles to aid in attack by mercury
   D. Achieve a workable mass of amalgam in minimum time

8. The effect of trituration on strength in an amalgam restoration depends on______________?

   A. Amalgam alloy
   B. Trituration time
   C. Speed of amalgamator
   D. All of the above

9. During amalgamation, trituration is done to_____________?

   A. Dissolve the alloy in mercury
   B. Coat the alloy particle with mercury
   C. Remove excess mercury from the amalgam
   D. Dissolve Hg in alloy

10. 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