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


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


dMercury sulphide



Crocus cloth is________________?


aEmery


bGarnet


cPumice


dRouge


View Answer Rouge

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