Dental Materials MCQs

Page No. 48

The strength of a gypsum investment is dependent on_______________?


aCarbon content


bSilica content


cGypsum


dCopper


View Answer Gypsum

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


aMartensite


bAustenite


cFerrite


dPearlite


View Answer Austenite

NiTi alloy have_______________?


aShape memory


bHyper rigidity


cCorrosion resistance


dWeldable properties


View Answer Shape memory

Pickling________________?


aIs accomplished by soaking the casting in baking soda


bCauses porosity in gold


cRemoves surface oxides from gold castings


dRemove investment from gold casting



Stainless steel orthodontic wire can be hardened by________________?


aTempering


bWork hardening


cAge hardening


dPrecipitation hardening


View Answer Work hardening

A thinner mix of a gypsum bonded investment will_______________?


aProduce a smoother casting


bDecrease setting expansion


cIncrease setting expansion


dIncrease thermal expansion



Which one of the following is most elastic ?


aa-titanium


bB-titanium


cChrome-cobalt-nickel


dNickel-titanium


View Answer Nickel-titanium

Cleaning of base metal alloy is done by______________?


aWarm HCl


bCold HF


cCold H2SO4


dSand blasting with aluminium oxide



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


aReducing flame


bOxidizing flame


cGreen flame


dAll of the above


View Answer Reducing flame

Back pressure porosity can be avoided by________________?


aUsing asbestos linear


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


cPreventing rapid heating the investment in burnout oven


dUsing a short and wide sprue



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