Dental Materials MCQs

Page No. 39

Reduction in the fusion temperature of dental gold casting alloys is caused by presence of______________?


aPlatinum


bCopper


cSilver


dGold


View Answer Copper

Function of carnauba wax_________________?


aTo provide a smooth and glossy surface


bIncrease toughness


cDecrease toughness


dDecrease flow at room temperature



The porosity formed due to simultaneous nucleation of solid grains and gas bubbles at the first moment that metal freezes at the mold walls is called__________?


aPinhole porosity


bGas inclusion porosity


cMicro porosity


dSubsurface porosity


View Answer Subsurface porosity

The standard perforated tray for us with alginate impression materials may be brought to more customized contour by_______________?


aUtility wax


bBase plate wax


cBreading wax


dBoxing wax


View Answer Utility wax

The base constituents of dental waxes come from three main sources except______________?


aAnimal


bMineral


cInsect


dVegetable


View Answer Animal

Stainless steel is used mostly in dentistry_________________?


aTo strength amalgam


bIn orthodontic wires


cTo construct clasps for partial dentures


dTo replace internal gold restorations


View Answer In orthodontic wires

A common electrolyte used for plating copper indirect dies is_______________?


aCopper cynide


bIonic copper


cAcidic copper sulfate


dSilver cynide


View Answer Acidic copper sulfate

Waxes are used for_______________?


aPrimary impressions


bCorrective impressions


cImpression of single tooth


dNone of the above



Passivating alloys are_______________?


aCr, Al, Ti


bCr, Mo, Ti


cCr, Gold, Ti


dCr, Fe, Ti


View Answer Cr, Al, Ti

Which of the following refractory is used to counteract most of the expansion________________?


aQuartz


bCristobalite


cTridymite


dCorundum


View Answer Cristobalite

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