Dental Materials MCQs

Page No. 19

The best tissue tolerated material for crown and bridge_______________?


aHighly polished acrylic


bHighly polished porcelain


cHighly glazed porcelain


dHighly polished metal



Which of the following is the main constituent of porcelain__________________?


aFeldspar


bKaolin


cQuartz


dClay


View Answer Feldspar

Porosity in porcelain can be prevented by_______________?


aThoroughness of condensation


bRapidity of firing


cHigh firing temperature


dAll of the above



Porcelain is best fired__________________?


aIn open air


bUnder air compression


cWhen several layer are fired simultaneously


dUnder minimum pressure


View Answer Under air compression

Condensation shrinkage of porcelain during firing depends on__________________?


aRate of arriving at firing temperature


bUniformity of particle size


cShape and size of particle


dType of investment used



Pyroplastic flow of porcelain is due to___________________?


aHigh temperature during glazing


bLow temperature during glazing


cImproper condensation


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


bDispersion of crystalline phase


cInducing residual compressive strength


dAll of the above



The cohesive gold used as bulk filler is_____________?


aElectra alloy


bMat gold


cSpherical gold


dGold foil


View Answer Mat gold

Pitting of direct filling old restoration usually results from_________________?


aImproper stepping of condenser point


bUsing small condenser point


cUsing contaminated gold foil


dPoor finished preparation



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