Impression Materials MCQs

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 ✔