Dental Materials MCQs

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 ✔

Option A: Low thermal conductivity

Option B: High flow property

Option C: Degradation is presence of moisture

Option D: Remain distortion free up to 72 hrs. pouring can be safely delayed

Correct Answer: Low thermal conductivity ✔

Option A: Mercaptan

Option B: Silicone

Option C: Reversible hydrocolloid

Option D: A and B

Correct Answer: A and B ✔

Option A: Metallic oxide paste

Option B: Silicone impression material

Option C: Reversible hydrocolloid

Option D: Impression plaster

Correct Answer: Metallic oxide paste ✔

Option A: Increase gel strength

Option B: Prevent syneresis

Option C: Prevent distortion

Option D: Wash off saliva on impression

Correct Answer: Wash off saliva on impression ✔

Option A: Agar

Option B: Alginic acid

Option C: Gelatin

Option D: alginate

Correct Answer: Agar ✔

Option A: Impression plaster

Option B: Hydrocolloids

Option C: Elastomer

Option D: Impression compound

Correct Answer: Hydrocolloids ✔

Option A: Adding a drop of eugenol

Option B: Adding a drop of water

Option C: Cooling the glass slab

Option D: Altering ratio of two pastes

Correct Answer: Cooling the glass slab ✔

Option A: Less compressive than alginate

Option B: More compressive than alginate

Option C: As compressive as alginate

Option D: More compressive than hydrocolloids

Correct Answer: Less compressive than alginate ✔

Option A: Reversible hydrocolloid

Option B: Mercaptan impression material

Option C: Zinc Phosphate cement

Option D: Zinc oxide-eugenol

Correct Answer: Mercaptan impression material ✔

Option A: Oral mucosal tissues

Option B: Dental hard tissues

Option C: Oral mucosal tissues and dental hard tissues

Option D: None of the above

Correct Answer: Oral mucosal tissues ✔

Option A: Seen as water loss

Option B: Water absorption

Option C: Shrinkage

Option D: Gelation

Correct Answer: Seen as water loss ✔

Option A: Agar-agar

Option B: Alginate

Option C: Zinc oxide eugenol

Option D: Plaster of paris

Correct Answer: Agar-agar ✔

Option A: Marcaptan group

Option B: Hydroxyl group

Option C: Silane group

Option D: Virryl group

Correct Answer: Hydroxyl group ✔

Option A: Moisture absorption

Option B: Temperature lag between gelation and liquefaction temperature

Option C: Phenomenon of conversion of gel into sol

Option D: All of the above

Correct Answer: Temperature lag between gelation and liquefaction temperature ✔

Option A: Adding a small amount of glycerine

Option B: Adding a small amount of water

Option C: Altering the amounts of the two pastes used

Option D: Cooling mixing slab

Correct Answer: Adding a small amount of water ✔

Option A: They evolve hydrogen when cast if they are not fully cured

Option B: They exhibit a very low setting shrinkage

Option C: They have a lower tear resistance than polysulphide rubbers

Option D: They set by condensation polymerisation

Correct Answer: They set by condensation polymerisation ✔

Option A: Chemical reaction

Option B: Cold

Option C: Heat

Option D: Pressure

Correct Answer: Chemical reaction ✔

Option A: Rapid spatulation results in decreased setting time

Option B: 2% potassium sulphate is accelerator

Option C: Citrates are retarders

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Not waiting for 20 min before pouring

Option B: High speed accelerator

Option C: Air incorporation in the mix

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Increased spatulation

Option B: Adding potassium sulfate

Option C: Less water powder ratio

Option D: Allowing setting under water

Correct Answer: Adding potassium sulfate ✔

Option A: Na2 So4

Option B: Nacl

Option C: Citrales

Option D: K2 So4

Correct Answer: Citrales ✔

Option A: Impression plaster

Option B: Model plaster

Option C: Stone plaster

Option D: Die stone

Correct Answer: Die stone ✔

Option A: Testing the strength of plaster of paris

Option B: Evaluating the setting time of plaster of pris

Option C: Testing the metal hardness

Option D: Testing the purity of noble metals

Correct Answer: Evaluating the setting time of plaster of pris ✔

Option A: Difference in solubility of CaSo4 ½ H2O + CaSO4+ 2H2O

Option B: Reaction between CaSO4+ 2H2O and water

Option C: Nucleation and growth of CaSo4 ½ H2O crystals

Option D: Reaction between hemihydrate and hihydrate

Correct Answer: Difference in solubility of CaSo4 ½ H2O + CaSO4+ 2H2O ✔

Option A: Impression plaster

Option B: Class I stone / Hydrocal

Option C: Class II stone/Densite

Option D: Model plaster

Correct Answer: Impression plaster ✔

Option A: Is wet calcined hemihydrate

Option B: Has porous and irregular crystals

Option C: Is a – hamihydrate

Option D: Has a W / P of 0.2

Correct Answer: Has porous and irregular crystals ✔

Option A: 0.05

Option B: 0.10

Option C: 0.15

Option D: 0.20

Correct Answer: 0.10 ✔

Option A: Chemical composition

Option B: Self life

Option C: Sharpe and size of particles

Option D: Solubility in water

Correct Answer: Sharpe and size of particles ✔

Option A: Impressions

Option B: Casts

Option C: Die

Option D: Casts and Dies

Correct Answer: Casts ✔

Option A: Dry strength

Option B: Green strength

Option C: Water strength

Option D: Compressive strength

Correct Answer: Green strength ✔

Option A: Which undergoes rapid expansion

Option B: In which accelerators or retarders have been added according to need

Option C: In which amount of water of hydration is controlled

Option D: In which the crystals are all of uniform size

Correct Answer: In which accelerators or retarders have been added according to need ✔

Option A: Plaster of paris

Option B: Soluble plaster

Option C: Anti – expansion solution

Option D: Die stones

Correct Answer: Soluble plaster ✔

Option A: Solubility

Option B: Shelf life

Option C: Chemical formula

Option D: Particle porosity

Correct Answer: Particle porosity ✔