Dental Materials MCQs

Page No. 45

Air bubbles formed on the surface of casting is probably due to________________?


aImproper casting pressure

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bImproper heating of the investment

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cImproper angulation of sprue

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dImproper wetting of the wax pattern by the investment

✓



Suck back porosity is due to_________________?


aAttached impurities on undersurface of casting

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bHot spot

✓


cNo rapid cooling

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dInadequate melting temperature

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View Answer Hot spot

Silver plated dyes use an electrolytic bath of_______________?


aSilver fluoride

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bSilver cyanide

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cSilver bromide

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dSilver iodide

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View Answer Silver cyanide

Which of the waxes are derived from the lignite_________________?


aParaffin wax

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bInlay wax

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cMicrocrystalline wax

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dMontan wax

✓


View Answer Montan wax

Most biocompatible material in oral cavity is_______________?


aPlatinum

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bPalladium

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cTitanium

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dGold

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View Answer Titanium

Which one of the following categories of dental materials has the highest thermal conductivity_________________?


aUnfilled acrylic plastics

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bGold alloys

✓


cPoreclains

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dZinc phosphate cements

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View Answer Gold alloys

The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing ?


aRecovery stage

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bRecrystallisation stage

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cGrain growth stage

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dAll of the above

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Corrosion of stainless steel is due to formulation of_________________?


aChromium carbide

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bCarbon carbide

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cIron carbide

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dNickel carbide

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View Answer Chromium carbide

The best pickling solution for gypsum bonded investment is_______________?


aHydrochloric acid

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bNitric acid

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cSulphuric acid

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dPhosphoric acid

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View Answer Hydrochloric acid

Shape memory is seen in________________?


aStainless steel wire

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bNITTINOL wire

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cTMA wire

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dAluminium

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View Answer NITTINOL wire

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