Dental Materials MCQs

Page No. 47

Sub surface porosity can be decreased by_______________?


aDecreasing the sprue length

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bDecreasing the sprue thickness

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cIncreasing the melting temperature

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dIncreasing the mould temperature

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Localised shrinkage porosity is seen when there________________?


aThin sprue

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bNo reservoir

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cInvestment heated strongly

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dInadequate air discharge

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View Answer Thin sprue

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


aOxidizing zone

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bReducing zone

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cCombustion zone

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dNone of the above

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View Answer Oxidizing zone

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


aAlpha form

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bBeta form

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cGamma form

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dNone of the above

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View Answer Gamma form

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


aMolybdenum

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bGermanium

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cTitanium

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dchromium

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View Answer Titanium

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


aWrought alloy

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bPalladium alloys

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cCobalt-chrome alloys

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dPartial denture casting gold in hardened condition

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View Answer Cobalt-chrome alloys

Tempering of steel cause________________?


aIncreases its toughness

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bIncrease hardness

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cIncrease ductility

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dDecreases its toughness

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View Answer Increase ductility

The contraction of gold alloy on solidifying is approximately_____________?


a0.4%

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b1.4%

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c2.4%

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d3.4%

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View Answer 1.4%

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


aInlay wax type-II

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bBoxing wax

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cModelling wax

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dCasting wax

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View Answer Casting wax

Ideal requirement of metal ceramic casting____________?


aLow fusing ceramic and high fusing alloys

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bMatching of coefficients of thermal expansion of ceramics and alloy

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cBonding between ceramic and alloy

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dAll of the above

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View Answer All of the above

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