Impression Materials

A. Seen as water loss
B. Water absorption
C. Shrinkage
D. Gelation

A. Agar-agar
B. Alginate
C. Zinc oxide eugenol
D. Plaster of paris

A. Marcaptan group
B. Hydroxyl group
C. Silane group
D. Virryl group

A. Moisture absorption
B. Temperature lag between gelation and liquefaction temperature
C. Phenomenon of conversion of gel into sol
D. All of the above

A. Adding a small amount of glycerine
B. Adding a small amount of water
C. Altering the amounts of the two pastes used
D. Cooling mixing slab

A. They evolve hydrogen when cast if they are not fully cured
B. They exhibit a very low setting shrinkage
C. They have a lower tear resistance than polysulphide rubbers
D. They set by condensation polymerisation

A. Chemical reaction
B. Cold
C. Heat
D. Pressure