Dental Materials MCQs

Page No. 48

The strength of a gypsum investment is dependent on_______________?


aCarbon content

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bSilica content

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cGypsum

✓


dCopper

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View Answer Gypsum

The main form of iron carbide found in 18-8 steel________________?


aMartensite

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bAustenite

✓


cFerrite

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dPearlite

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View Answer Austenite

NiTi alloy have_______________?


aShape memory

✓


bHyper rigidity

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cCorrosion resistance

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dWeldable properties

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View Answer Shape memory

Pickling________________?


aIs accomplished by soaking the casting in baking soda

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bCauses porosity in gold

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cRemoves surface oxides from gold castings

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dRemove investment from gold casting

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Stainless steel orthodontic wire can be hardened by________________?


aTempering

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bWork hardening

✓


cAge hardening

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dPrecipitation hardening

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View Answer Work hardening

A thinner mix of a gypsum bonded investment will_______________?


aProduce a smoother casting

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bDecrease setting expansion

✓


cIncrease setting expansion

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dIncrease thermal expansion

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Which one of the following is most elastic ?


aa-titanium

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bB-titanium

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cChrome-cobalt-nickel

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dNickel-titanium

✓


View Answer Nickel-titanium

Cleaning of base metal alloy is done by______________?


aWarm HCl

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bCold HF

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cCold H2SO4

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dSand blasting with aluminium oxide

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Which of the following zones is used for melting alloy during casting______________?


aReducing flame

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bOxidizing flame

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cGreen flame

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dAll of the above

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View Answer Reducing flame

Back pressure porosity can be avoided by________________?


aUsing asbestos linear

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bPlacing the sprue at least one quarter inch away form the end of casting ring

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cPreventing rapid heating the investment in burnout oven

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dUsing a short and wide sprue

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