Dental Materials MCQs

Page No. 20

The malleting force is directed______________?


aPerpendicular to the walls

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bParallel to long axis of crown

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c45° to the wall

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dNone of the above

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View Answer 45° to the wall

Which of the following is true about direct filling gold______________?


aProperly condensed mat gold has no voids

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bWhatever may be the type voids are inherent

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cVoids can be avoided with manual condensation

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dNone of the above

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Powdered gold is___________________?


aMade by a combination of chemical precipitation and atomization

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bMade by electrolytic precipitation

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cMade by beating pure gold at high temperatures

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dMade by milling pure gold ingots

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


aHigh firing temperature

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bDisintegration of opaque layer

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cPresence of copper

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dFormation of excess oxides

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View Answer Presence of copper

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


aCrystalline

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bGranular gold

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cMat gold

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dSponge gold

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View Answer Granular gold

The carat for Au foil used for restorations is_______________?


a18

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b20

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c22

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d24

✓


View Answer 24

Electralloy is an alloy of________________?


aGold and Platinum

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bCobalt and Chromium

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cGold and Calcium

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dTin and Chromium

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View Answer Gold and Calcium

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


aCohesive gold

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bNon cohesive gold

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cClass I casting gold

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dClass IV casting gold

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View Answer Cohesive gold

Average particle size of powdered gold is________________?


a10 um

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b15 um

✓


c30 um

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d0.1 um

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View Answer 15 um

Cohesion of gold foil is an example of______________?


aAtomic attraction and welding

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bAnnealing

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cWedging

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dAdaptation

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