Dental Materials MCQs

Page No. 25

Plaster mix____________?


aRapid spatulation results in decreased setting time

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b2% potassium sulphate is accelerator

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cCitrates are retarders

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dAll of the above

✓


View Answer All of the above

The Zinc oxide-eugenol impression pastes harden by________________?


aChemical reaction

✓


bCold

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cHeat

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dPressure

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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

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bThey exhibit a very low setting shrinkage

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cThey have a lower tear resistance than polysulphide rubbers

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dThey set by condensation polymerisation

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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

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bAdding a small amount of water

✓


cAltering the amounts of the two pastes used

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dCooling mixing slab

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Hysteresis in a hydrocolloid gel is______________?


aMoisture absorption

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bTemperature lag between gelation and liquefaction temperature

✓


cPhenomenon of conversion of gel into sol

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dAll of the above

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


aMarcaptan group

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bHydroxyl group

✓


cSilane group

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dVirryl group

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View Answer Hydroxyl group

Best material for duplicating cast is_______________?


aAgar-agar

✓


bZinc oxide eugenol

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cAlginate

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dPlaster of Paris

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View Answer Agar-agar

Syneresis seen in hydrocolloid gel is______________?


aSeen as water loss

✓


bWater absorption

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cShrinkage

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dGelation

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View Answer Seen as water loss

Impression techniques are used for recording________________?


aOral mucosal tissues

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bDental hard tissues

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cOral mucosal tissues and dental hard tissues

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dNone of the above

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Vulcanization refers to the setting of__________________?


aReversible hydrocolloid

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bMercaptan impression material

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cZinc Phosphate cement

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dZinc oxide eugenol

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