Dental Materials MCQs

Page No. 17

Compared with dental alloys, CERAMICS show____________________?


aHigh ductility

✖


bHigh hardness

✖


cLow esthetic value

✖


dSusceptibility to brittle fracture

✓



Greening occuring when porcelains are fired on silver free alloys may be attributed to________________?


aVaporization of silver from the walls of contaminated furnaces

✓


bSurface diffusion of silver from the marginal metal

✖


cMore rapid silver diffusion in sodium containing glass

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dSilver ionization by porcelains with high oxygen potential

✖



Electrolyte used for plating copper dies is________________?


aIonic copper

✖


bCopper cyanide

✖


cSilver cyanide

✖


dAcidic copper sulphate

✓



The melting point of titanium is __________ degree celsius?


a1056

✖


b1560

✖


c1668

✓


d1886

✖


View Answer 1668

Which of the following releases single wavelength of energy ?


aQTH

✖


bLED

✖


cPAC

✖


dArgon lasers

✓


View Answer Argon lasers

Clogging of an abrasive wheel with debris causing reduction of abrasive action is called________________?


aBlinding

✓


bBuffing

✖


cDressing

✖


dTruing

✖


View Answer Blinding

When porcelain is basked against metal, it should possess a________________?


ahigh fusion expansion

✖


bhigh fusion temperature

✖


clinear coefficient of thermal expansion less than but close to that of metal

✓


dlinear coefficient of thermal expansion greater than but close to that of metal

✖



Ceramics fired to metals are processed by_______________?


aHeat pressing

✖


bMachining

✖


cSintering

✓


dSlip casting

✖


View Answer Sintering

The most toxic form of mercury is_________________?


aMethyl and ethyl mercury

✓


bMercury vapor

✖


cInorganic mercury forms

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dMercury sulphide

✖



Crocus cloth is________________?


aEmery

✖


bGarnet

✖


cPumice

✖


dRouge

✓


View Answer Rouge

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