Dental Materials MCQs

Page No. 47

Sub surface porosity can be decreased by_______________?


aDecreasing the sprue length


bDecreasing the sprue thickness


cIncreasing the melting temperature


dIncreasing the mould temperature



Localised shrinkage porosity is seen when there________________?


aThin sprue


bNo reservoir


cInvestment heated strongly


dInadequate air discharge


View Answer Thin sprue

Which zone is the hottest and efficient burning zone of the flame used for casting ?


aOxidizing zone


bReducing zone


cCombustion zone


dNone of the above


View Answer Oxidizing zone

Austenite is an alloy of iron of and carbon with the iron in______________?


aAlpha form


bBeta form


cGamma form


dNone of the above


View Answer Gamma form

Apart from composites and ceramics, another material that could be copy milled easily and inexpensively is_________________?


aMolybdenum


bGermanium


cTitanium


dchromium


View Answer Titanium

Which of the following will produce the most rigid restoration for framework of same dimension ?


aWrought alloy


bPalladium alloys


cCobalt-chrome alloys


dPartial denture casting gold in hardened condition


View Answer Cobalt-chrome alloys

Tempering of steel cause________________?


aIncreases its toughness


bIncrease hardness


cIncrease ductility


dDecreases its toughness


View Answer Increase ductility

The contraction of gold alloy on solidifying is approximately_____________?


a0.4%


b1.4%


c2.4%


d3.4%


View Answer 1.4%

The pattern for the metallic framework of a removable partial denture is fabricated from________________?


aInlay wax type-II


bBoxing wax


cModelling wax


dCasting wax


View Answer Casting wax

Ideal requirement of metal ceramic casting____________?


aLow fusing ceramic and high fusing alloys


bMatching of coefficients of thermal expansion of ceramics and alloy


cBonding between ceramic and alloy


dAll of the above


View Answer All of the above

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