Impression Tray handles

Question 1

When may a large handle be required?

Answer 1

If big undercuts following extraction

-> easier to remove if impregum

Question 2

What are the advantages of an intra-oral handle?

Answer 2

Smaller- stays in mouth

Doesn’t interfere with lip (easier impression)

Question 3

What are the advantages of finger rests?

Answer 3

Keeps tray in right position and prevent distortion of impression material

-> Good for stabilising in resorbed ridge
-> Can be combined with certain handles

Question 4

Why may 2 post dams be beneficial?

Answer 4

If patient doesn’t tolerate further back post dam you can cut it to the first

Question 5

What is the purpose of foil relief?

Answer 5

Gives gap to prevent acrylic pressing on bony prominences (tori)

Question 6

What are the likely causes of a denture not fitting at delievery? What can be done?

Answer 6

 Issue during impression taking- not noticed at trial
 Processing issue within lab
 Movement of teeth

-> Check for areas of acrylic that need adjusting that are not allowing denture to seat (Remake if required)