Dental Materials MCQs

Page No. 19

The best tissue tolerated material for crown and bridge_______________?


aHighly polished acrylic

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bHighly polished porcelain

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cHighly glazed porcelain

✓


dHighly polished metal

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Which of the following is the main constituent of porcelain__________________?


aFeldspar

✓


bKaolin

✖


cQuartz

✖


dClay

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View Answer Feldspar

Porosity in porcelain can be prevented by_______________?


aThoroughness of condensation

✓


bRapidity of firing

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cHigh firing temperature

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dAll of the above

✖



Porcelain is best fired__________________?


aIn open air

✖


bUnder air compression

✓


cWhen several layer are fired simultaneously

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dUnder minimum pressure

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View Answer Under air compression

Condensation shrinkage of porcelain during firing depends on__________________?


aRate of arriving at firing temperature

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bUniformity of particle size

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cShape and size of particle

✓


dType of investment used

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Pyroplastic flow of porcelain is due to___________________?


aHigh temperature during glazing

✓


bLow temperature during glazing

✖


cImproper condensation

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dHigh firing temperature

✖



To prevent porosity in dental porcelain it should be backed________________?


aBoric oxide

✖


bIn vacuum

✓


cFor long period

✖


dUnder pressure

✖


View Answer In vacuum

Chemical tempering in porcelains is done to interrupt crack propagation by______________?


aTransformation toughening

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bDispersion of crystalline phase

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cInducing residual compressive strength

✓


dAll of the above

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The cohesive gold used as bulk filler is_____________?


aElectra alloy

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bMat gold

✓


cSpherical gold

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dGold foil

✖


View Answer Mat gold

Pitting of direct filling old restoration usually results from_________________?


aImproper stepping of condenser point

✓


bUsing small condenser point

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cUsing contaminated gold foil

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dPoor finished preparation

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