Dental Materials MCQs

Page No. 39

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


aPlatinum

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bCopper

✓


cSilver

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dGold

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View Answer Copper

Function of carnauba wax_________________?


aTo provide a smooth and glossy surface

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bIncrease toughness

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cDecrease toughness

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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

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bGas inclusion porosity

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cMicro porosity

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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

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cBreading wax

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dBoxing wax

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View Answer Utility wax

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


aAnimal

✓


bMineral

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cInsect

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dVegetable

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View Answer Animal

Stainless steel is used mostly in dentistry_________________?


aTo strength amalgam

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bIn orthodontic wires

✓


cTo construct clasps for partial dentures

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dTo replace internal gold restorations

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View Answer In orthodontic wires

A common electrolyte used for plating copper indirect dies is_______________?


aCopper cynide

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bIonic copper

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cAcidic copper sulfate

✓


dSilver cynide

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View Answer Acidic copper sulfate

Waxes are used for_______________?


aPrimary impressions

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bCorrective impressions

✓


cImpression of single tooth

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dNone of the above

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Passivating alloys are_______________?


aCr, Al, Ti

✓


bCr, Mo, Ti

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cCr, Gold, Ti

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dCr, Fe, Ti

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View Answer Cr, Al, Ti

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


aQuartz

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bCristobalite

✓


cTridymite

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dCorundum

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View Answer Cristobalite

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