Dental Materials MCQs

Page No. 25

Plaster mix____________?


aRapid spatulation results in decreased setting time


b2% potassium sulphate is accelerator


cCitrates are retarders


dAll of the above


View Answer All of the above

The Zinc oxide-eugenol impression pastes harden by________________?


aChemical reaction


bCold


cHeat


dPressure


View Answer Chemical reaction

All of the following statements about Type II silicon impression material are true EXCEPT_______________?


aThey evolve hydrogen when cast if they are not fully cured


bThey exhibit a very low setting shrinkage


cThey have a lower tear resistance than polysulphide rubbers


dThey set by condensation polymerisation



All of the following can be used to slow down the setting of Zinc oxide eugenol impression paste EXCEPT_________________?


aAdding a small amount of glycerine


bAdding a small amount of water


cAltering the amounts of the two pastes used


dCooling mixing slab



Hysteresis in a hydrocolloid gel is______________?


aMoisture absorption


bTemperature lag between gelation and liquefaction temperature


cPhenomenon of conversion of gel into sol


dAll of the above



The base paste of the condensation poly sillicone has a low molecular weight dimethyl siloxane with a terminal-group_______________?


aMarcaptan group


bHydroxyl group


cSilane group


dVirryl group


View Answer Hydroxyl group

Best material for duplicating cast is_______________?


aAgar-agar


bZinc oxide eugenol


cAlginate


dPlaster of Paris


View Answer Agar-agar

Syneresis seen in hydrocolloid gel is______________?


aSeen as water loss


bWater absorption


cShrinkage


dGelation


View Answer Seen as water loss

Impression techniques are used for recording________________?


aOral mucosal tissues


bDental hard tissues


cOral mucosal tissues and dental hard tissues


dNone of the above



Vulcanization refers to the setting of__________________?


aReversible hydrocolloid


bMercaptan impression material


cZinc Phosphate cement


dZinc oxide eugenol



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