Dental Materials MCQs

Page No. 7

Percentage of tin in low copper alloy is______________?


a30-35%


b26-28%


c13-32%


d23-30%


View Answer 26-28%

Amalgam restorations give the best clinical service when the residual mercury content is_______________?


a38-42%


b48-52%


c58-62%


d68-72%


View Answer 48-52%

During amalgamation, trituration is done to_____________?


aDissolve the alloy in mercury


bCoat the alloy particle with mercury


cRemove excess mercury from the amalgam


dDissolve Hg in alloy



The largest component of amalgam alloy is_____________?


aSilver


bTin


cZinc


dCopper


View Answer Silver

High copper dental amalgams are superior to other amalgams because high copper dental amalgems______________?


aHave less marginal breakdown


bAre workable at lower Hg-alloy ratio


cHave a higher ratio of tensile to compressive strength


dHave less resistance to tarnish and corrosion



In non zinc containing dental amalgam alloy the percentage of zinc present is______________?


aLess than 0.02%


bLess than 0.1%


cLess than 0.01%


dNone of the above


View Answer Less than 0.01%

Setting time of Amalgam is best controlled by _______________?


aUsing spherical particles


bLathe cut alloy


cAltering Hg-Alloy ratio


dTrituration time


View Answer Trituration time

Finishing and polishing of Amalgam make the restoration______________?


aIncrease in tarnish and corrosion resistance


bIncrease the marginal strength


cDecrease the tarnish and corrosion resistance


dIncrease compressive strength



Admixed high copper alloy powder contains_________________?


a9-20% copper


b13-20% copper


c9-30% copper


d13-30% copper


View Answer 9-20% copper

According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be________________?


a80 Mpa


b140 Mpa


c260 Mpa


d510 Mpa


View Answer 80 Mpa

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