Dental Materials MCQs

Page No. 40

Crucible indicated for casting base metal alloys is______________?


aCarbon crucible


bClay crucible


cQuartz crucible


dHigh melting plastic crucible


View Answer Quartz crucible

Heat hardening is the process done at_______________?


aHeating 750°C and slowly cooling to zero degree


bHeating quickly upto 450°C followed by sudden quenching


cHeating upto 250°C for 15 to 30 min


dHeating at 750°C and then quenching to room temperature



Titanium casting is done_____________?


aUnder vacuum in argon atmosphere


bUnder air pressure in nitrogen atmosphere


cIn specially fabricated aluminium vanadium


dUsing CAD-CAM technique



Gold content of an 18 carat alloy is______________?


a25%


b50%


c75%


d100%


View Answer 75%

The sprue in wax pattern should be placed________________?


aAt right angle


bAt 45°C angle


cAt obtuse angle


dIt depend upon type of wax pattern


View Answer At 45°C angle

Quartz in investment material is added for_______________?


aStrength


bExpansion components for casting shrinkage


cDecrease strength


dContraction



Inlay wax is used to_______________?


aTemporarily cement inlays:


bMake inlay wax patterns


cInvest inlay patterns


dBox models



18-B Stainless steel orthodontic wire has_______________?


a18% Nickel 8% Chrominum


b18% Chromium 8% Nickel


c18% Chromium 8% Cobalt


d18% Carbon 8% Iron



Disadvantage of having a short sprue is________________?


aRapid solidification of metal


bNo place for reservoirs


cIncomplete evacuation of gases


dDifficulty in removing casting from investment



Who was the first person to introduce cast inlay restoration into dentistry ?


aWilliam H Taggart


bBuonocore


cG.V. Black


dBowen


View Answer William H Taggart

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