Dental Materials MCQs

Page No. 41

The main ingredient of inlay wax is__________________?


aCandelelia wax


bParaffin wax


cCarnauba wax


dGum dammar


View Answer Paraffin wax

Casting flux is used to_______________?


aPrevent the oxidation of the metal during melting


bincrease the melting point of the flux


cFlaring the point of the sprue attachment


dNone of the above



Gases dissolved in molten metals are liberated when cooled giving rise to________________?


aSuckback porosity


bGas inclusion porosity


cLocalized shrinkage porosity


dMicro porosity



Percentage of gold in high noble alloy is______________?


aN 25%


b25%


c>40%


d0%


View Answer >40%

Which of the following is function of fluoride flux in soldering process ?


aIt prevents the formation of copper oxide


bIt prevents the formation of chromium oxide or dissolves chromic oxide layer


cIt prevents the flow of material in undesirable area


dIncrease the strength of solder



Which one of the following elements is NOT added is small amount to be used as grain refiners ?


aIridium


bRuthinium


cIndium


dPlatinum


View Answer Platinum

Binder in phosphate bonded investment is______________?


aMagnesium oxide & phosphate


bMagnesium oxide & phosphoric acid


cMagnesium oxide & Monoammonium phosphate


dMagnesium oxide & ortho phosphoric acid



Which of the following fuel gases used for soldering, has the highest heat content______________?


aHydrogen


bNatural gas


cAcetylene


dPropane


View Answer Propane

Which of the following increases castability of base metal alloys________________?


aTin


bBeryllium


cMolybdenum


dCarbon


View Answer Beryllium

During soldering, the solidus temperature of the filler material should be_____________?


aGreater than the substrate material


bLesser than the substrate material


cEqual to the substrate material


dTemperature not relevant



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