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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