Dental Materials MCQs

Page No. 15

The addition of which of the following can accelerate the setting time of zinc oxide cement_____________?


aZinc acetate

✓


bBarium sulphate

✖


cZinc sulphate

✖


dBarium chloride

✖


View Answer Zinc acetate

Which of the following is common to both zinc eugenol cement and polycarboxylate cement?


aPolyacrylic acid is liquid

✖


bChemical bond to tooth structure

✖


cChelation

✓


dSubstitution o eugenol by EBA to increase strength of cement

✖


View Answer Chelation

Minimum thickness for type I zinc phosphate cement should be_______________?


a15 microns

✖


b25 microns

✓


c50 microns

✖


d100 microns

✖


View Answer 25 microns

Glass ionomer cements are composed of______________?Glass ionomer cements are composed of______________?


aAlumino silicate powder and phosphoric acid

✖


bAluminosillicate powder and polyacrylate

✓


cZinc oxide powder and phosphoric acid

✖


dZinc oxide powder and polyacrylate liquid

✖



Porcelain denture teeth________________?


aHave a higher coefficient of thermal expansion than acrylic teeth:

✖


bHave a lower abrasion resistance than enamel

✖


cShould be used where the inter dental clearance is small

✖


dHave a higher abrasion resistance than gold

✓



The opacity in ceramics is achieved by adding_______________?


aBoric oxide

✖


bCopper oxide

✖


cSilica

✖


dTitanium oxide

✓


View Answer Titanium oxide

Porosity in porcelain at condensation stage depends on_________________?


aShape and size of particle

✓


bUniform distribution of particle size

✖


cNumber of particles

✖


dNone of the above

✖



In porcelain metal elements are embedded in the matrix of________________?


aRubber matrix

✖


bPlastic

✖


cGlass

✓


dResin matrix

✖


View Answer Glass

Phenomenon in which porcelain appears different under varying light condition is______________?


aTranslucency

✖


bRefractive optics

✖


cMetamerism

✓


dOpacification

✖


View Answer Metamerism

Machineable glass ceramic is________________?


aCerestore

✖


bDecor MGC

✓


cInfusium

✖


dLeucite

✖


View Answer Decor MGC

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