Dental Materials MCQs

Page No. 34

Syneresis is associated with______________?


aHydrocolloids


bElastomers


cZinc oxide eugenol


dPlaster of paris


View Answer Hydrocolloids

Alginates are_____________?


aSol


bGel


cHydrocolloid


dColloid


View Answer Hydrocolloid

In reversible hydrocolloid the property by which the transformation from sol to gel and gel to sol is a function of the_____________?


aConcentration of filler and plasticizer


bPercentage composition by weight of water


cConcentration of potassium sulphate


dTemperature


View Answer Temperature

The plasticizers used in polyether impression material is_______________?


apolyether polymer


bColloidal silica


cGlycol ether


dDi-vinyl poly (dimethyl siloxane)


View Answer Glycol ether

Wash or corrective impression is done by______________?


aAlginate


bImpression paste


cImpression plaster


dRubber base impression material


View Answer Impression paste

K2SO4 in agar-agar is for_______________?


aAccelerating the setting stage of gypsum


bIncrease strength


cGive dimensional stability


dNone of the above



During setting of alginate impression materials________________?


aTrisodium phosphate reacts with sodium sulphate


bTrisodium phosphate reacts with calcium sulphate


cColloidal changes to sol


dMaterial in contact with soft tissues sets last



Perforated impression tray are used for_______________?


aAlginate


bAgar-agar


cZinc oxide-eugenol


dImpression compound


View Answer Alginate

Agar is prepared from_______________________?


aBullock heart


bChemicals


cSea weed


dChick cells


View Answer Sea weed

Lenolin is added is ZOE paste to______________?


aDecrease flow


bIncrease flow


cAccelerate reaction


dDecrease irritation due to eugenol


View Answer Increase flow

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