Impression Materials MCQs

Option A: Solid

Option B: Liquid

Option C: Gas

Option D: Colloid

Correct Answer: Colloid ✔

Option A: It should be rapidly displaced from the mouth

Option B: It may exhibit fluid exudates on the surface as a result of imbibition of water

Option C: It will take up water and expand if kept wet

Option D: It will shrink as a result of syneresis

Correct Answer: It may exhibit fluid exudates on the surface as a result of imbibition of water ✔

Option A: Their use

Option B: Their hardness after setting

Option C: Water content

Option D: Eugenol content

Correct Answer: Their hardness after setting ✔

Option A: Imbibition

Option B: Syneresis

Option C: Hysteresis

Option D: Gelation

Correct Answer: Imbibition ✔

Option A: Addition poly silicone

Option B: Agar-agar

Option C: Polysulphide

Option D: Polyether

Correct Answer: Addition poly silicone ✔

Option A: Act as a scavenger

Option B: Helps as surfactant

Option C: Acts as plasticizer

Option D: Acts as a catalyst

Correct Answer: Act as a scavenger ✔

Option A: Condensation polysillicon

Option B: Addition Polysilicon

Option C: Polyether

Option D: A and B

Correct Answer: Condensation polysillicon ✔

Option A: High viscosity elastomeric impression material

Option B: Medium viscosity elastomeric impression material

Option C: Low viscosity elastomeric impression material

Option D: None of the above

Correct Answer: Low viscosity elastomeric impression material ✔

Option A: Non-elastic impression material

Option B: Thermoplastic impression material

Option C: More mucostatic than ZOE

Option D: Less mucostatic than ZOE

Correct Answer: Less mucostatic than ZOE ✔

Option A: High viscosity elastomer

Option B: Medium viscosity elastomer

Option C: Medium & low viscosity elastomer

Option D: Low viscosity elastomer

Correct Answer: Low viscosity elastomer ✔

Option A: Impression wax

Option B: Modelling compound

Option C: Hydro-colloid

Option D: Hydro cal

Correct Answer: Hydro-colloid ✔

Option A: Mechanical action of saliva

Option B: Physical change

Option C: Evolution

Option D: Chemical change

Correct Answer: Physical change ✔

Option A: Irreversible hydrocolloid

Option B: Reversible hydrocolloid

Option C: Impression plaster

Option D: Metallic oxide paste

Correct Answer: Reversible hydrocolloid ✔

Option A: Raising the temperature of water used for maxing

Option B: Using excess water for maxing

Option C: Lowering the temperature of water used for mixing

Option D: None of the above

Correct Answer: Raising the temperature of water used for maxing ✔

Option A: Continue to polymerize

Option B: Become elastic

Option C: Show imbibition and syneresis

Option D: Show gelation

Correct Answer: Continue to polymerize ✔

Option A: Thin mix of plaster of paris

Option B: Zinc oxide eugenol impression paste

Option C: Free flowing wax

Option D: Reversible hydrocolloids

Correct Answer: Thin mix of plaster of paris ✔

Option A: Slight rocking of the impression to disengage it from the undercut

Option B: Wetting the periphery of the impression with moist cotton to break the peripheral seal

Option C: Sudden jerking of the impression to prevent tearing

Option D: Supporting the impression along with the tray to prevent disengaging of the tray alone

Correct Answer: Sudden jerking of the impression to prevent tearing ✔

Option A: Silicone

Option B: Agar-agar

Option C: Impression paste

Option D: Impression plaster

Correct Answer: Agar-agar ✔

Option A: Decrease flow

Option B: Increase flow

Option C: Accelerate reaction

Option D: Decrease irritation due to eugenol

Correct Answer: Increase flow ✔

Option A: Bullock heart

Option B: Chemicals

Option C: Sea weed

Option D: Chick cells

Correct Answer: Sea weed ✔

Option A: Alginate

Option B: Zinc oxide-eugenol

Option C: Agar-agar

Option D: Impression compound

Correct Answer: Alginate ✔

Option A: Trisodium phosphate reacts with sodium alginate

Option B: Trisodium phosphate reacts with calcium sulphate

Option C: Colloidal changes to sol

Option D: Material in contact with soft tissues sets last

Correct Answer: Trisodium phosphate reacts with calcium sulphate ✔

Option A: Accelerating the setting stage of gypsum

Option B: Increase strength

Option C: Give dimensional stability

Option D: None of the above

Correct Answer: Accelerating the setting stage of gypsum ✔

Option A: Impression plaster

Option B: Impression paste

Option C: Alginate

Option D: Rubber base impression material

Correct Answer: Impression paste ✔

Option A: polyether polymer

Option B: Colloidal silica

Option C: Glycol ether

Option D: Di-vinyl poly (dimethyl siloxane)

Correct Answer: Glycol ether ✔

Option A: Concentration of filler and plasticizer

Option B: Percentage composition by weight of water

Option C: Concentration of potassium sulphate

Option D: Temperature

Correct Answer: Temperature ✔

Option A: Sol

Option B: Gel

Option C: Hydrocolloid

Option D: Colloid

Correct Answer: Hydrocolloid ✔

Option A: Hydrocolloids

Option B: Elastomers

Option C: Zinc oxide eugenol

Option D: Plaster of paris

Correct Answer: Hydrocolloids ✔

Option A: Has dimensional stability

Option B: Does not adhere to tissues

Option C: Is easy manipulation

Option D: Does not require special trays

Correct Answer: Has dimensional stability ✔

Option A: Remove excess impression material

Option B: Remove saliva

Option C: Hydrate the impression

Option D: Accelerate the setting

Correct Answer: Remove saliva ✔

Option A: Impression plaster

Option B: Irreversible hydrocolloid

Option C: Reversible hydroollioid

Option D: None of the above

Correct Answer: Irreversible hydrocolloid ✔

Option A: Impression plaster

Option B: Impression paste

Option C: Silicon impression material

Option D: None of the above

Correct Answer: None of the above ✔

Option A: CaCl2

Option B: Zinc acetate

Option C: Alcohol

Option D: Glycerine

Correct Answer: Glycerine ✔

Option A: Aromatic sulfonate esters

Option B: Stannous octate

Option C: Platinum salt catalyst

Option D: Lead dioxide

Correct Answer: Lead dioxide ✔

Option A: Custom trays facilitate uniform contraction of impression material

Option B: Custom trays require less impression material

Option C: Stock trays may be short in the flange area

Option D: Impressions made n the custom trays are easier to remove from the mouth

Correct Answer: Impressions made n the custom trays are easier to remove from the mouth ✔

Option A: Olive oil

Option B: Linseed oil

Option C: Zinc acetate

Option D: All of these

Correct Answer: Zinc acetate ✔

Option A: Addition silicone

Option B: Polysulphide

Option C: Polyetner

Option D: Condensation silicone

Correct Answer: Condensation silicone ✔

Option A: Liquefies between 71 – 100°C

Option B: Solidfies between 50 – 70°C

Option C: Facilitates fabrication of metal dyes

Option D: Cannot register fine surface details

Correct Answer: A. Liquefies between 71 – 100°C ✔

Option A: Borax

Option B: Water

Option C: Sulfates

Option D: Carbonates

Correct Answer: Borax ✔

Option A: 100 ml of water to 60 gms of powder

Option B: 40 ml of water to 40 gms of powder

Option C: 40 ml of water to 15 gms of powder

Option D: 15 ml of water to 40 gms of powder

Correct Answer: 40 ml of water to 15 gms of powder ✔

Option A: Alginate

Option B: Agar

Option C: Elastome

Option D: Zno paste

Correct Answer: Elastome ✔

Option A: 43.5°C

Option B: 39°C

Option C: 65°C

Option D: 100°C

Correct Answer: 39°C ✔

Option A: Air incorporated during mixing

Option B: Improper application of pressure during impression making

Option C: Presence of excessive saliva in impression area

Option D: Due to improper ratio of polymer and monomer

Correct Answer: Due to improper ratio of polymer and monomer ✔

Option A: 4%

Option B: 6%

Option C: 8%

Option D: 10%

Correct Answer: 6% ✔

Option A: Unpleasant odor and taste

Option B: Low accuracy

Option C: Least permanent deformation

Option D: Highest curing shrinkage

Correct Answer: Unpleasant odor and taste ✔

Option A: Hysterisis

Option B: Imbibition

Option C: Recrytallisation

Option D: Syneresis

Correct Answer: Recrytallisation ✔

Option A: Zinc oxide eugenol

Option B: Impression compound

Option C: Alginate

Option D: Plaster of paris

Correct Answer: Impression compound ✔

Option A: Light body and putty used at the same time

Option B: Putty used first and light body used second

Option C: Light body first and putty later

Option D: None of the above

Correct Answer: Putty used first and light body used second ✔

Option A: 2 mm

Option B: 2-4 mm

Option C: Greater than 3 mm

Option D: Maximum in the area of operation

Correct Answer: Maximum in the area of operation ✔

Option A: Rockwell tester

Option B: Barcol indenter

Option C: Knoop pyramid

Option D: Shore durometer

Correct Answer: Shore durometer ✔

Option A: Inadequate mixing

Option B: Air bubbles

Option C: Too rapid polymerization

Option D: Incomplete polymerization caused by premature removal from mouth

Correct Answer: Incomplete polymerization caused by premature removal from mouth ✔

Option A: Polyether

Option B: Polysulphide

Option C: Addition silicone

Option D: Condensation silicone

Correct Answer: Polyether ✔

Option A: Polyether

Option B: Addition silicone

Option C: Polysulphide

Option D: Condensation silicone

Correct Answer: Addition silicone ✔

Option A: Condensation silicone

Option B: Polyether

Option C: Polysulfide

Option D: Poly vinyl siloxane

Correct Answer: Poly vinyl siloxane ✔

Option A: After the start of appearing elastic properties of impression material

Option B: Just after the start of appearing elastic properties of impression material

Option C: Just before the start of appearing elastic properties of impression material

Option D: Loss of luster of impression material

Correct Answer: Just before the start of appearing elastic properties of impression material ✔

Option A: Sodium alginate

Option B: Potassium alginate

Option C: Trisodium phosphate

Option D: Calcium alginate

Correct Answer: Calcium alginate ✔

Option A: Reducing the diatomaceous earth

Option B: Adding heavy metal salts

Option C: Coating with dihydric alcohol

Option D: Altering the matrix

Correct Answer: Coating with dihydric alcohol ✔

Option A: Zinc Oxide eugenol impression paste

Option B: Hydrocolloid impression material

Option C: Elastomeric impression material

Option D: All of the above

Correct Answer: Elastomeric impression material ✔

Option A: Injecting technique

Option B: Laminate technique

Option C: Immersion technique

Option D: Tempering technique

Correct Answer: Laminate technique ✔

Option A: Addition polysilicone

Option B: Condensation polysilicone

Option C: Polyether

Option D: Polysulfide

Correct Answer: Polysulfide ✔

Option A: Improper application of pressure during impression making

Option B: Air incorporated during mixing

Option C: Too rapid polymerization

Option D: Presence of moisture in impression area

Correct Answer: Too rapid polymerization ✔

Option A: Plaster of paris

Option B: Agar – agar

Option C: Zinc oxide eugenol

Option D: Elastomers

Correct Answer: Plaster of paris ✔

Option A: Hydrocolloids, silicones, polyether, polysulfide

Option B: Silicones, hydrocolloids, polyether, polysulfide

Option C: Polysulfide, hydrocolloids, silicones, polyether

Option D: Hydrocolloids, polyether, silicones, polysulfide

Correct Answer: Hydrocolloids, silicones, polyether, polysulfide ✔

Option A: Impression compound

Option B: Alginate

Option C: ZOE paste

Option D: Elastomer

Correct Answer: ZOE paste ✔

Option A: Agar

Option B: Alginate

Option C: Elastomers

Option D: Impression compound

Correct Answer: Agar ✔

Option A: Ethyl alcohol

Option B: Glycol

Option C: Acetate

Option D: Propanolol

Correct Answer: Ethyl alcohol ✔

Option A: Zinc Sulphate & Zinc chloride

Option B: Zinc chloride & Eugenol

Option C: Zinc Sulphate & Eugenol

Option D: Glycerin

Correct Answer: Zinc Sulphate & Zinc chloride ✔

Option A: Polysulphide > polyether > Condensation silicone > Addition silicone

Option B: polyether > Condensation silicone > Polysulphide > Addition silicone

Option C: Addition silicone > polyether > Polysulphide > Condensation silicone

Option D: Addition silicone> Condensation silicone > Polysulphide > polyether

Correct Answer: Addition silicone > polyether > Polysulphide > Condensation silicone ✔

Option A: Syringe agar and chilled tray alginate

Option B: Syringe agar and tray agar

Option C: Syringe agar and impression compound

Option D: Chilled alginate and impression compound

Correct Answer: Syringe agar and chilled tray alginate ✔

Option A: Impression compound

Option B: Impression paste

Option C: Addition silicone

Option D: Alginate

Correct Answer: Impression compound ✔

Option A: Addition silicone < polyether < polysulfide < condensation silicone

Option B: Addition silicone < polysulfide < Polyether < condensation silicone

Option C: condensation silicone < polyether < polysulfide < Addition silicone

Option D: condensation silicone < polysulfide < polyether < Addition silicone

Correct Answer: Addition silicone < polyether < polysulfide < condensation silicone ✔

Option A: After the start of appearing elastic properties of impression material

Option B: Just after the start of appearing elastic properties of impression material

Option C: The time for start of mixing till just before the start of appearing elastic properties of impression material

Option D: Loss of lusture of impression material

Correct Answer: The time for start of mixing till just before the start of appearing elastic properties of impression material ✔

Option A: 2% Potassium sulfate

Option B: 0.2% Potassium sulfate

Option C: 2% sodium sulfate

Option D: 4% Potassium sulfate

Correct Answer: 2% Potassium sulfate ✔

Option A: Polymerization occurs with repeated elimination of small molecules

Option B: Polymerization occurs with elimination of single byproduct

Option C: By condensation of repeated molecules of monomers

Option D: Condensation does not occur at all

Correct Answer: Polymerization occurs with repeated elimination of small molecules ✔

Option A: Using less water powder ratio

Option B: Storing the impression under water

Option C: Prolonged manipulation

Option D: Using humidor

Correct Answer: Using humidor ✔

Option A: Mineral oil

Option B: Surfactant

Option C: Water

Option D: Plasticizer

Correct Answer: Surfactant ✔

Option A: Retarder

Option B: Modifier

Option C: Plasticier

Option D: Accelerator

Correct Answer: Accelerator ✔

Option A: Glycol

Option B: Glyecrol

Option C: Glutamic acid

Option D: alcohol

Correct Answer: Glyecrol ✔

Option A: Boiling

Option B: Condensation

Option C: Vulconization

Option D: Chain lengthening

Correct Answer: Vulconization ✔

Option A: Single mix material have higher viscosity

Option B: Shear thinning is related to viscosity of non phase impression material

Option C: Improper mixing of material can cause permanent deformation of impression

Option D: Putty – wash technique of impression reduces dimensional change of setting

Correct Answer: Single mix material have higher viscosity ✔

Option A: Warps at room temperature

Option B: Is a thermoset material

Option C: Shows increased flow when kneaded with water

Option D: Low coefficient of thermal conductivity

Correct Answer: Is a thermoset material ✔

Option A: Reduced dimensional instability

Option B: Improved adhesion of the impression to the tray

Option C: Minimal permanent deformation

Option D: Reduced contamination by saliva

Correct Answer: Minimal permanent deformation ✔

Option A: Zinc oxide-eugenol

Option B: Reversible hydrocolloid

Option C: Alginate

Option D: Polysulphide rubber

Correct Answer: Zinc oxide-eugenol ✔

Option A: Hydrophilic

Option B: Hydrophobic

Option C: Water loving impression materials

Option D: Potassium alginates

Correct Answer: Hydrophobic ✔

Option A: Hydrocolloid

Option B: Impression compound

Option C: Elastomer

Option D: Zinc oxide eugenol

Correct Answer: Hydrocolloid ✔

Option A: Gelation increase in both on increase in temperature

Option B: Mixing time is increased to reduce the setting time

Option C: Deformation during removal of impression occurs due to distortion of gel fibers

Option D: Both can be re-used for fresh impressions

Correct Answer: Deformation during removal of impression occurs due to distortion of gel fibers ✔

Option A: 20°C to 25°C

Option B: 27°C to 33°C

Option C: 37°C to 50°C

Option D: 55°C to 60°C

Correct Answer: 37°C to 50°C ✔

Option A: Zinc oxide impression material

Option B: Agar

Option C: Condensation silicone

Option D: Polyether

Correct Answer: Agar ✔

Option A: Polysulphide

Option B: Silicone

Option C: Impression plaster

Option D: Zinc oxide eugenol paster

Correct Answer: Impression plaster ✔

Option A: Impression compound

Option B: Alginate

Option C: Agar-agar

Option D: Polyether

Correct Answer: Impression compound ✔

Option A: Close adaptation to soft tissues

Option B: With drawl without permanent distortion

Option C: Reproduction of surface details

Option D: Compatibility with gypsum products

Correct Answer: With drawl without permanent distortion ✔

Option A: Low thermal conductivity

Option B: Crystalline structure

Option C: Formation of cross linkage with heating

Option D: High fusion temperature

Correct Answer: Low thermal conductivity ✔

Option A: polysulfides

Option B: Condensation silicones

Option C: addition silicones

Option D: Polyether

Correct Answer: Polyether ✔

Option A: Retarder

Option B: Reactor

Option C: Accelerator

Option D: Plasticizer

Correct Answer: Retarder ✔

Option A: Impression compound

Option B: Zinc Oxide eugenol (ZOE) paste

Option C: Wax

Option D: Polyvinyl siloxane

Correct Answer: Polyvinyl siloxane ✔

Option A: 19

Option B: 20

Option C: 21

Option D: 26

Correct Answer: 19 ✔

Option A: Alginate

Option B: Agar

Option C: Polyethers

Option D: Imp. Compound

Correct Answer: Polyethers ✔

Option A: Condensation silicone

Option B: Alginate

Option C: Polysulfide

Option D: Addition silicone

Correct Answer: Polysulfide ✔

Option A: increasing the working time of alginate impression material

Option B: Acts as an accelerator

Option C: Initiating the setting reaction

Option D: Provides gel strength

Correct Answer: increasing the working time of alginate impression material ✔

Option A: Agar

Option B: Alginate impression material

Option C: Both of the above

Option D: Primary impression

Correct Answer: Both of the above ✔