Dental Materials MCQs

Page No. 46

Impurities in casting is removed by________________?


aAnnealing

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bDegassing

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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

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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

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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

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

✖


dImproves the thermal expansion between the metal and porcelain

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View Answer Improve bonding

The purity of gold is expressed in________________?


aCarats

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bPercentage

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cFineness

✓


dGram

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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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