Dental Materials MCQs

Page No. 44

Dendrites in cst alloys form by mechanism of_________________?


aConstitutional superconductivity


bConstitutional supercooling


cConstitutional supergritting


dConstitutional supergraining



Microstructure of cobalt chromium alloy in cast condition is______________?


aFibrous


bHomogenous


cInhomogenous


dAmorphous


View Answer Inhomogenous

Component of inlay wax which makes it flake resistant is_____________?


aParaffin


bCarnauba


cGum dammar


dCanadelila


View Answer Gum dammar

Advantage of titanium over other base metal alloys_______________?


aLow weight


bLow cost


cLow strength


dLow melting point


View Answer Low weight

Nickel-Titanium alloy has__________________?


aUnreliable spring back


bLow spring back


cMinimal spring back


dNone of the above


View Answer None of the above

Binder used in Gypsum investment is_________________?


aQuartz


bSilica


cCristobolite


dCalcium sulphate monohydrate



The component in very minor quantity in stainless steel that changes the properties to a maximum level is____________?


aCarbon


bMolybdenum


cNickel


dchromium


View Answer Carbon

Suck back porosity in the casting can be eliminated by________________?


aIncreasing the mould metal temperature difference


bIncreasing the flow of molten metal


cFlaring the point of the sprue attachment


dAll of the above



Which of the following decrease with strain hardening______________?


aProportional limit


bStrength


cSurface hardness


dCorrosion resistance


View Answer Corrosion resistance

Asbestos liner is used in a casting ring to________________?


aFacilitate venting of the mold


bRetard the heating of the investment


cPermit expansion of the world


dAll of the above



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