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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