298-302

Question 1

why do we use custom trays instead of elastomeric impressions

Answer 1

more accurate in uniform, thin layers of 2-3 mm

Question 2

the tray should be prepared how many hours in advance of making impression

Answer 2

6 hours

Question 3

as the monomer undergoes polymerization, it shrinks by ___%

Answer 3

8%

Question 4

significant linear changes occur during the __ of tray fabrication

Answer 4

first 40 minutes

Question 5

how can an arylic resin tray be stabilized against further shrinkage and distortion

Answer 5

boiling it before placing impression material in it

Question 6

why should elastomeric impression material not be stored in a moist environment

Answer 6

acrylic resin train may imbibe water and distort

Question 7

what happens if you don’t let the adhesive on the impression material dry

Answer 7

material may separate from tray when removed from mouth

Question 8

who says to use foil: gradoville or shil

Answer 8

shil