Dental Materials MCQs

Page No. 5

Co-efficient of Thermal exansion of amalgam is______________?


a6.6 a (ppm k-1)


b14.0 a (ppm k-1)


c25.0 a (ppm k-1)


d11.4 a (ppm k-1)


View Answer 25.0 a (ppm k-1)

Which of the following are characteristic feature of high copper amalgam alloy ?


aLow compressive strength


bHigh marginal breakdown


cLess marginal


dHigh creep


View Answer Less marginal

Cavo surface angle for amalgam resoration is butt joint as____________?


aIt increases compresssive and tensile strengths


bDecreased compressive, increased strength


cDecreased compressive, decreased strength


dIncreased compressive, increased tensile strength



Decrease in creep occurs in_______________?


aUnder trituration or over trituration of amalgam


bDecreases with condensation pressure


cIncrease with condensation pressure


dCannot be predictable



The effect of trituration on strength in an amalgam restoration depends on______________?


aAmalgam alloy


bTrituration time


cSpeed of amalgamator


dAll of the above


View Answer All of the above

What fraction of inhaled mercury vapors retained in the body ?


a45-55%


b55-65%


c65-85%


dMore than 85%


View Answer 65-85%

Mercury is toxic because it_____________?


aComplexes with hemoglobinto form methemoglobin


bInhibits hemoglobin synthesis, producing anemia


cInhibits anaerobic glycolysis


dBinds to sulfhydryl groups



Amalgam achieves 70% of the strength by____________?


a2 hours


b4 hours


c8 hours


d16 hours


View Answer 8 hours

Creep value of which of the following is the highest ?


aLow copper amalgam alloy


bAdmix alloy


cSingle composition alloys


dCreep value of all the above mentioned alloys is same



Which of the following statement is true regarding lathe cut low Copper silver alloy ?


aRequires least amount of mercury


bAchieves high compressive strength at 1 hr.


cHas tensile strength both at 15 minutes and 7 days is comparable to high copper, unicompositional alloys


dHas lower creep value



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