Dental Materials MCQs

Page No. 37

Gap between true end of casting ring and wax pattern should be______________?


a½ inch

✖


b¼ inch

✓


c3/8 inch

✖


done inch

✖


View Answer ¼ inch

Which is the use of boxing an impression______________?


aEase of construction of denture

✖


bPreserving the sulci

✖


cEase of pouring an impression

✓


dAll of the above

✖



Resistance to corrosion in a cobalt-chrome casting is due to presence of_______________?


aHigh quality iron

✖


bChrome

✓


cCobalt

✖


dNickel

✖


View Answer Chrome

Flux is used during casting to________________?


aRemove the oxides formed on the gold alloy

✓


bLower the melting point

✖


cReplace casting wax

✖


dSpeed the burnout process

✖



The maximum carbon content of steel used in dentistry is__________________?


a19%

✖


b2%

✖


c1.7%

✓


d4%

✖


View Answer 1.7%

Wax pattern is ideally invested immediately to decrease the dimensional changes caused by_______________?


aDecrease flow

✖


bContinuous expansion

✖


cRelaxation of the internal stresses

✓


dWater loss

✖



The most commonly used Titanium alloy for dental and medical purposes is________________?


aTi 6Al 4V

✓


bTi 5Al 4V

✖


cTi 5Al 5V

✖


dTi 6Al 6V

✖


View Answer Ti 6Al 4V

Cobalt-Chrominum alloys contains_______________?


a30% cobalt and 60% chrominum

✖


b60% cobalt and 30% chrominum

✓


c1% palladium

✖


d20% gold

✖



Gypsum bonded investment should not be heated over______________?


a700°C

✓


b1300°C

✖


c1063°C

✖


d900°C

✖


View Answer 700°C

Glossy smooth margins of a casting are due to_____________?


aShrinkage of alloy on cooling

✖


bInvestment breakdown

✖


cIncomplete wax elimination

✓


dIncomplete gas elimination

✖



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