Definitive impressions

Question 1

Why are master impressions taken

Answer 1

To get the most accurate working cast of the teeth, after any tooth prep is done, to produce the denture from

Question 2

What material is typically used for master impressions

Answer 2

Polyvinylsiloxane (medium bodied)

Question 3

When asking for the trays, how much space should you ask to be accounted for?

Answer 3

1.5-3mm for medium bodied silicone

Question 4

What should you do if the tray is over/under extended?

Answer 4

If over, trim with an acrylic bur

If under, use green stick to extend

Question 5

What is the procedure for taking master impressions?

Answer 5

Disinfect the tray in the perform then try it in

Adjust if need be then fill with impression medium and take the impression

Question 6

What should be written on the lab card for a CoCr denture?

Answer 6

Pour in improved stone

Construct CoCr framework per design

Sign the design

Question 7

What should be written on the lab card for an acrylic denture?

Answer 7

Pour in 100% dental stone

Construct record blocks

(Shellac base upper)

(Wire strengthened lower)