High strength amalgam is achieved by_____________?
High strength amalgam is achieved by_____________? A. Maximum matrix and minimum alloy phaseB. Minimum matrix and maximum alloy phase C. Maximum matrix phase D. Minimum alloy phase
High strength amalgam is achieved by_____________? A. Maximum matrix and minimum alloy phaseB. Minimum matrix and maximum alloy phase C. Maximum matrix phase D. Minimum alloy phase
Once triturated, the Dental amalgam should be condensed with in_____________? A. 5 minutes B. 6 minutesC. 3 minutes D. 15 minutes
The solid solution of silver and mercury is called_______________? A. y1 B. y2 C. B1 D. y
Advantage of minimum mercury technique or Eames technique is all Except________________? A. High strength B. Sets quickly C. Needs no squeezing of excess mercuryD. Greater plasticity and adapts well to cavity walls
Mercury rich condition in a slow setting amalgam alloy system in a resoration in______________? A. Accelerated corrosion B. Fracture of the restoration C. Merginal damageD. All of the above
Over-trituration of silver alloy and mercury_______________? A. Reduces contractionB. 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
Mercury intoxication in dental office mainly results from____________? A. Direct contact with the mercuryB. Inhalation of mercury vapours C. Ingestion of mercury D. None of the above
The threshold limit value of mercury exposures is_______________? A. mg / m3B. 0.05 mg / m3 C. mg / m3 D. mg / m3
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
Which phase provides maximum strength in hardened mercury/silver alloy ? A. Silver / Mercury phaseB. Silver / Tin phase C. Tin / Mercury phase D. Zinc / Mercury phase