Impressions for Complete Dentures

Question 1

What is the aim of primary impressions?

Answer 1

Should accurately record clinically relevant landmarks without excessive distortion

Question 2

What is the aim of master impressions (2nd impressions)?

Answer 2

Record denture bearing area, functional depth and width of sulci
Use custom made special trays prescribed after primary impressions

Question 3

What materials are commonly used for master impressions?

Answer 3

Alginate and greenstick (for tray adaptation)

Question 4

How do you disinfect an impression?

Answer 4

Rinse in running water to remove saliva, blood or debris
Disinfect for 10 minutes in disinfectant solution in perform
Rinse thoroughly
Cover alginate impressions with a damp paper towel
Label and place is a plastic lab bag
On lab prescription indicate that impressions have been disinfected which must be signed by supervising clinician