Dental Materials MCQs

Page No. 28

Brush heap structure is found in______________?


aZinc oxide impression material


bAgar


cCondensation silicone


dPolyether


View Answer Agar

Gelation temparature of agar is between________________?


a20°C to 25°C


b27°C to 33°C


c37°C to 50°C


d55°C to 60°C


View Answer 37°C to 50°C

Alginate impression material is similar to Agar-agar impression material in the following respect________________?


aGelation increase in both on increase in temperature


bMixing time is increased to reduce the setting time


cDeformation during removal of impression occurs due to distortion of gel fibers


dBoth can be re-used for fresh impressions



Hardening solutions are used with impression made of________________?


aHydrocolloid


bImpression compound


cElastomer


dZinc oxide eugenol


View Answer Hydrocolloid

Elastomers except: Polyether are_______________?


aHydrophilic


bHydrophobic


cWater loving impression materials


dPotassium alginates


View Answer Hydrophobic

Which of the following impression material is rigid ?


aZinc oxide-eugenol


bReversible hydrocolloid


cAlginate


dPolysulphide rubber


View Answer Zinc oxide-eugenol

Rapid removal of rubber impression with a single firm motion results in____________________?


aReduced dimensional instability


bImproved adhesion of the impression to the tray


cMinimal permanent deformation


dReduced contamination by saliva



Impression compound is characterized by all of the following except_______________?


aWarps at room temperature


bIs a thermoset material


cShows increased flow when kneaded with water


dLow coefficient of thermal conductivity



Which of the following is not true about elastomeric impression ?


aSingle mix material have higher viscosity


bShear thinning is related to viscosity of non phase impression material


cImproper mixing of material can cause permanent deformation of impression


dPutty – wash technique of impression reduces dimensional change of setting



The process of changing the rubber base product or liquid polymer, to a rubber like material is generally known as_____________?


aBoiling


bCondensation


cVulconization


dChain lengthening


View Answer Vulconization

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