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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