Dental Materials MCQs

Page No. 46

Impurities in casting is removed by________________?


aAnnealing


bDegassing


cPickling


dConditioning


View Answer Pickling

The gold alloys used for casting contain at least…. percent of precious metal according to ADA specification number 5________________?


a55


b65


c75


d85


View Answer 75

Casting shrinkage is compensated by_______________?


aThermal expansion


bHygroscopic expansion


cWax expansion


dAll of the above


View Answer All of the above

Shape memory in NiTi is because of stress induced form__________________?


aAustenite to martensite


bMartensite to austenite


cFerrite to austenite


dAustenite to ferrite



Boxing wax is also called as________________?


aCarding wax


bInlay wax


cUtilty wax


dSticky wax


View Answer Carding wax

Silica sol__________________?


aIs applied to the walls of the investment to produce hygroscopic expansion


bIncrease the strength and the setting expansion of the phosphate-bonded investment


cActs as a retarder in the silica bonded investments


dActs as a refractory in the silica bonded investments



Investment material used for cobalt-chromium alloys is_____________?


aGypsum bonded


bPhosphate bonded


cSilica bonded


dNone of the above


View Answer Phosphate bonded

In a metal ceramic crown for a FPD the function of tin, indium which are readily oxidized minor constituents is to________________?


aImprove bonding


bDecrease porosity


cThey react with the porcelain opaque layer, which masks the metal


dImproves the thermal expansion between the metal and porcelain


View Answer Improve bonding

The purity of gold is expressed in________________?


aCarats


bPercentage


cFineness


dGram


View Answer Fineness

The inlay wax most commonly used for direct technique_____________________?


aType 1


bType 2


cType 3


dType 4


View Answer Type 1

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