Master Impressions for Complete Dentures

Question 1

What is check prior to taking a master impression?

Answer 1

• Fit and extension

- -> If stretching muscle attachments, adjust with acrylic bur and straight handpiece

Question 2

Where is tracing compound (greenstick) placed in relation to the special tray?

Answer 2

UPPER

• Along post dam area
• Canine ‘stops’

LOWER

• Along retromolar pad area
• Ridge of canines

Question 3

What instructions are given to the lab following master impressions?

Answer 3

• Please pour impressions in 100% stone
• Construct upper and lower record blocks with wax rims
• Upper with shellac base and lower with wire strengthener