Dental Materials MCQs

Page No. 20

The malleting force is directed______________?


aPerpendicular to the walls


bParallel to long axis of crown


c45° to the wall


dNone of the above


View Answer 45° to the wall

Which of the following is true about direct filling gold______________?


aProperly condensed mat gold has no voids


bWhatever may be the type voids are inherent


cVoids can be avoided with manual condensation


dNone of the above



Powdered gold is___________________?


aMade by a combination of chemical precipitation and atomization


bMade by electrolytic precipitation


cMade by beating pure gold at high temperatures


dMade by milling pure gold ingots



When Gold fused with porcelain is fired at very high temperature greenish discoloration of cervical margin is due to________________?


aHigh firing temperature


bDisintegration of opaque layer


cPresence of copper


dFormation of excess oxides


View Answer Presence of copper

Direct filling gold formed by electrolytic precipitation is called by all the terms EXCEPT______________?


aCrystalline


bGranular gold


cMat gold


dSponge gold


View Answer Granular gold

The carat for Au foil used for restorations is_______________?


a18


b20


c22


d24


View Answer 24

Electralloy is an alloy of________________?


aGold and Platinum


bCobalt and Chromium


cGold and Calcium


dTin and Chromium


View Answer Gold and Calcium

The pure form of gold used in dentistry is known as___________________?


aCohesive gold


bNon cohesive gold


cClass I casting gold


dClass IV casting gold


View Answer Cohesive gold

Average particle size of powdered gold is________________?


a10 um


b15 um


c30 um


d0.1 um


View Answer 15 um

Cohesion of gold foil is an example of______________?


aAtomic attraction and welding


bAnnealing


cWedging


dAdaptation



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