Dental Materials MCQs

Page No. 43

The term ordered hardening heat treatment used in which of the following dental alloys ?


aGold-Copper


bNickel-Chromium


cNickel-Titanium


dSilver-Palladium


View Answer Gold-Copper

Stages of annealing in order_________________?


aRecovery recrystallization grain growth


bRecrystallization recovery, grain growth


cGrain Growth Recrystallization recovery


dMelting point, grain growth, Recrystallization



Nickel is added to wrought gold alloys as______________?


aStrengthener


bHardener


cWhitens the alloy


dScavenger


View Answer Strengthener

Modern dental noble metal casting alloys generally have equiaxed fine grain structures because of the incorporation of small amounts of______________?


aChromium


bIndium


cIrridium


dPalladium


View Answer Irridium

Which of the following cast gold alloys is used for fabricating partial denture frameworks______________?


aType I – Soft


bType II– Hard


cType III – Hard


dType IV – Extra Hard



The linear solidification shrinkage of Type IV Ni-Cr based alloys is_______________?


a2.3%


b1.56%


c1.37%


d3%


View Answer 2.3%

With indirect spruing. Which one of the following porosities can be minimised_______________?


aBack pressure porosity


bLocalized shrinkage porosity


cPinhole porosity


dMicro porosity



The effects associated with cold working can be eliminated by a heat treatment called______________?


aAge hardening heat treatment


bAnnealing heat treatment


cHomogenization heat treatment


dSolution heat treatment



Mechanical properties of Cp Titanium are similar to alloys_____________?


aType III and Type IV gold


bType V and Type VI gold


cType VII and Type VIII gold


dNone of the above



Compared with noble metals, base metals show_______________?


aIncreased hardness


bIncreased ductility


cBetter biocompatibility


dIncreased density


View Answer Increased hardness

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