Dental Materials MCQs

Page No. 1

The term trituration means____________?


aLysing amalgam alloy


bMixing of amalgam alloy and mercury


cRemoval of excess of mercury


dNone of the above



The highest mercury concentration in amalgam filling is found_____________?


aAt the margin of the restoration


bIn the centre of the restoration


cIn the deepest part of the restoration


dNone of the above



The ADA specification No 1 for composition of amalgam alloy recommends______________?


a65% silver, 32% tin and 3% copper


b49% silver, 32% tin and 19% cooper


c65% silver, 29% tin and 5-6% copper


dNone of the above



Which of the following phases of dental amalgam has minimum strength____________?


aGamma 1


bGamma 2


cEpsilon 1


dGamma 3


View Answer Gamma 2

Compare to conventional amalgams, spherical amalgams_______________?


aRequire more mercury


bRequire heavy compection forces


cHave longer setting times


dNone of the above


View Answer None of the above

Which of the following statements about high copper silver alloy compared to conventional alloy is not true ?


aIt has increased tensile and compressive strength


bIt has poor tarnish and corrosion resistance


cIt’s edge strength is greater


dMercury content in the final restoration is less



Increase in the residual mercury in silver amalgam filling can_____________?


aCause fracture of the filling


bTarnish and corrosion


cIncrease the strength


dDecrease condensation pressure



Chronic mercury toxicity results from_____________?


aIngestion while removing old amalgam


bSkin contact


cMercury vapour


dAll of the above


View Answer All of the above

In spherical alloys as compared to lathe cut____________?


aLess condensing force is required


bMore condensing force is required


cBoth require same condensing force


dManipulation is easy



Well premeasured capsules of amalgam can release mercury vapour during_______________?


aMulling


bCarving


cCondensation


dTrituration


View Answer Condensation

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