Dental Materials MCQs

Page No. 28

Brush heap structure is found in______________?


aZinc oxide impression material

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bAgar

✓


cCondensation silicone

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dPolyether

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View Answer Agar

Gelation temparature of agar is between________________?


a20°C to 25°C

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b27°C to 33°C

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c37°C to 50°C

✓


d55°C to 60°C

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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

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bMixing time is increased to reduce the setting time

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

✓


dBoth can be re-used for fresh impressions

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Hardening solutions are used with impression made of________________?


aHydrocolloid

✓


bImpression compound

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cElastomer

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dZinc oxide eugenol

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View Answer Hydrocolloid

Elastomers except: Polyether are_______________?


aHydrophilic

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bHydrophobic

✓


cWater loving impression materials

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dPotassium alginates

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View Answer Hydrophobic

Which of the following impression material is rigid ?


aZinc oxide-eugenol

✓


bReversible hydrocolloid

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cAlginate

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dPolysulphide rubber

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View Answer Zinc oxide-eugenol

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


aReduced dimensional instability

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bImproved adhesion of the impression to the tray

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cMinimal permanent deformation

✓


dReduced contamination by saliva

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Impression compound is characterized by all of the following except_______________?


aWarps at room temperature

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bIs a thermoset material

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cShows increased flow when kneaded with water

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dLow coefficient of thermal conductivity

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Which of the following is not true about elastomeric impression ?


aSingle mix material have higher viscosity

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bShear thinning is related to viscosity of non phase impression material

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cImproper mixing of material can cause permanent deformation of impression

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dPutty – wash technique of impression reduces dimensional change of setting

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


aBoiling

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bCondensation

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cVulconization

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dChain lengthening

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View Answer Vulconization

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