Dental Materials MCQs

Page No. 38

Incomplete casting is the result of_____________?


aMore porous investment in the mould


bNarrow sprue diameter


cHollow sprue pin


dLarge reservoir


View Answer Narrow sprue diameter

Mouth temperature waxes are_______________?


aIowa wax


bModeling wax


cGreen stick wax


dNone of the above


View Answer Iowa wax

Indium in metal alloys_______________?


aImprove bonding


bHarden the metal ceramic Ag-Pd alloy


cBoth A and B


dNone of the above


View Answer Both A and B

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


aHigh gold


bLow gold


cPalladium – Ag


dNi – Cr


View Answer Ni – Cr

Tublulence of molten gold is due to _____________?


aImpurities in gold


bImproper venting


cBoth A and B


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


bThermal conductivity


cWarpage


dTarnish and corrosion


View Answer Tarnish and corrosion

The yield strength of AUstenite (NiTi alloy) is______________?


a100 Mpa


b240 Mpa


c560 Mpa


d700 Mpa


View Answer 560 Mpa

Stabilization of stainless steel is achieved by adding____________?


aCarbon


bchromium


cNickel


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


cEliminate air bubbles on the wax pattern


dReproduce fine detail



Softening heat treatment of alloy increases_________________?


aProportional limit


bTensile strength


cDuctility


dHardness


View Answer Ductility

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