Dental Materials MCQs

Page No. 42

The solvent flux used for base metal soldering is_______________?


aBoric acid


bBorax


cFluoride


dRouge


View Answer Borax

In Base metal alloys, Corrosion resistance occurs due to___________________?


aPassivity


bHigh Fusion Temperature


cHigh Molecular Weight


dCo-efficient of Thermal Expansion


View Answer Passivity

The castability of chromium-cobait base metal alloys when compared to gold based noble metal alloys is_______________?


aMore


bLess


cEqual


dDepends on the alloy type


View Answer Less

Fins and spines on the casting is seen due to_______________?


aRapid heating


bProlonged heating


cWater film contamination


dToo high pressure during casting


View Answer Rapid heating

Solder and flux used for joining Elgiloy wires are_____________?


aGold solder and borax flux


bGold solder and fluoride flux


cSilver solder and borax flux


dSilver solder and fluoride flux



Which of the following fuel gases is the best choice of heat source to carry out soldering process ?


aPropane


bAcetylene


cNatural gas


dHydrogen


View Answer Propane

The best fuel gas when used with oxygen is______________?


aHydrogen


bNatural gas


cPropane


dAcetylene


View Answer Propane

Annealing is also known as_______________?


aSoft heat treatment


bHaed heat treatment


cPrecipitating heat treatment


dStress relieving heat treatment



Quartz is added to gypsum bonded investment to______________?


aIncrease the strength


bCounter balance contraction of gypsum during heating


caid in hygroscopic expansion


dIncrease the shelf life of investment



Linear coefficient of thermal expansion of metal used for metal caramic restoration range from________________?


a11.5-12.5×10-6/°C


b10.5-11.5×10-6/°C


c13.5-14.5×10-6/°C


d16.5-17.5×10-6/°C


View Answer 13.5-14.5×10-6/°C

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