Dental Materials MCQs

Page No. 40

Crucible indicated for casting base metal alloys is______________?


aCarbon crucible

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bClay crucible

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cQuartz crucible

✓


dHigh melting plastic crucible

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View Answer Quartz crucible

Heat hardening is the process done at_______________?


aHeating 750°C and slowly cooling to zero degree

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bHeating quickly upto 450°C followed by sudden quenching

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cHeating upto 250°C for 15 to 30 min

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dHeating at 750°C and then quenching to room temperature

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Titanium casting is done_____________?


aUnder vacuum in argon atmosphere

✓


bUnder air pressure in nitrogen atmosphere

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cIn specially fabricated aluminium vanadium

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dUsing CAD-CAM technique

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Gold content of an 18 carat alloy is______________?


a25%

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b50%

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c75%

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d100%

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View Answer 75%

The sprue in wax pattern should be placed________________?


aAt right angle

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bAt 45°C angle

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cAt obtuse angle

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dIt depend upon type of wax pattern

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View Answer At 45°C angle

Quartz in investment material is added for_______________?


aStrength

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bExpansion components for casting shrinkage

✓


cDecrease strength

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dContraction

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Inlay wax is used to_______________?


aTemporarily cement inlays:

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bMake inlay wax patterns

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cInvest inlay patterns

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dBox models

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18-B Stainless steel orthodontic wire has_______________?


a18% Nickel 8% Chrominum

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b18% Chromium 8% Nickel

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c18% Chromium 8% Cobalt

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d18% Carbon 8% Iron

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Disadvantage of having a short sprue is________________?


aRapid solidification of metal

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bNo place for reservoirs

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cIncomplete evacuation of gases

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dDifficulty in removing casting from investment

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


aWilliam H Taggart

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bBuonocore

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cG.V. Black

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dBowen

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View Answer William H Taggart

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