Directions for edentulous casts

Question 1

posterior border on maxillary arch cast

Answer 1

posterior border extends from hamular notch to hamular notch

Question 2

what do you outline in pencil

Answer 2

deoth of the fold areas - relieving frenal attachments and an additional line 3 mm inferior to first - but parallel

Question 3

what do you block out?describe and give examples

Answer 3

undercuts - slightly divergent to analyzing rod - ridge, tuberosity, retro-mylohyoid spaces, with ax using a #7 wax spatula

Question 4

after waxing the block out - apply what?

Answer 4

model releasing agent to the blockout areas

Question 5

clear impression trey material thickness and technique

Answer 5

maintian initial 2-3 mm thickness - especially in block out areas

• should maintain 3mm short on facial or lingual
• excess use to make handle over central incisors at 45 degree angle

Question 6

cure in triad for how long?

Answer 6

4 minutes

Question 7

after triad cure add what?

Answer 7

air barrier coat

Question 8

where do you trim your casts?

Answer 8

to second line - the 3 mm line - except very back of mandibular or maxillary arch to allow sufficient room for border molding compound.
trim frenum attachment areas as well

Question 9

minimum ubdercut allowed

Answer 9

2mm to depth of the fold - do not want any undercuts on the INTERNAL WALL OF THE LAND