601. Advantage of minimum mercury technique or Eames technique is all Except________________?

A. High strength
B. Sets quickly
C. Needs no squeezing of excess mercury
D. Greater plasticity and adapts well to cavity walls

602. Mercury rich condition in a slow setting amalgam alloy system in a resoration in______________?

A. Accelerated corrosion
B. Fracture of the restoration
C. Merginal damage
D. All of the above

603. Over-trituration of silver alloy and mercury_______________?

A. Reduces contraction
B. Increases the strength of lathe cut alloy but reduces the strength of spherical alloy amalgam
C. Decreases creep
D. Gives al dull and crumbly amalgam

604. Mercury intoxication in dental office mainly results from____________?

A. Direct contact with the mercury
B. Inhalation of mercury vapours
C. Ingestion of mercury
D. None of the above

605. The threshold limit value of mercury exposures is_______________?

A. mg / m3
B. 0.05 mg / m3
C. mg / m3
D. mg / m3

606. 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

607. 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

608. Copper content in low copper amalgam is________________?

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

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

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

610. What is the most frequently used restorative material ?

A. Silicate
B. Amalgam
C. Composite
D. Gold

NOTE
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