Dental Materials MCQs

Page No. 38

Incomplete casting is the result of_____________?


aMore porous investment in the mould

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bNarrow sprue diameter

✓


cHollow sprue pin

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dLarge reservoir

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View Answer Narrow sprue diameter

Mouth temperature waxes are_______________?


aIowa wax

✓


bModeling wax

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cGreen stick wax

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dNone of the above

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View Answer Iowa wax

Indium in metal alloys_______________?


aImprove bonding

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bHarden the metal ceramic Ag-Pd alloy

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cBoth A and B

✓


dNone of the above

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View Answer Both A and B

In a patient with allergy to costume jewelry, which of the following is contraindicated______________?


aHigh gold

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bLow gold

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cPalladium – Ag

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dNi – Cr

✓


View Answer Ni – Cr

Tublulence of molten gold is due to _____________?


aImpurities in gold

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bImproper venting

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cBoth A and B

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dNone of the above

✓


View Answer None of the above

A highly polished surface on a metallic dental restoration aids considerably in the prevention of the____________?


aDimensional change

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bThermal conductivity

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cWarpage

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dTarnish and corrosion

✓


View Answer Tarnish and corrosion

The yield strength of AUstenite (NiTi alloy) is______________?


a100 Mpa

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b240 Mpa

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c560 Mpa

✓


d700 Mpa

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View Answer 560 Mpa

Stabilization of stainless steel is achieved by adding____________?


aCarbon

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bchromium

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cNickel

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dTitanium

✓


View Answer Titanium

The function of a sprue is to_______________?


aForm an opening of molten metal to enter the mold

✓


bHelp polish cast restorations

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cEliminate air bubbles on the wax pattern

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dReproduce fine detail

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Softening heat treatment of alloy increases_________________?


aProportional limit

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bTensile strength

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cDuctility

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dHardness

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View Answer Ductility

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