primary impressions

Question 1

what is the purpose of a tray try in?

Answer 1

to fit the width, depth and length of arch

Question 2

what should you do before trying a tray/ which tray to pick?

Answer 2

examine px and estimate size of tray

use dentures as a guide

Question 3

what should you do if no tray is perfect?

Answer 3

addition of wax or removal of areas with a handpiece

Question 4

why does alginate suit most situations?

Answer 4

elastic

irreversible hydrocolloid

Question 5

what may you choose to use to capture free end saddle areas? why?

Answer 5

impression compound
stabilizes tray
supports alginate

Question 6

what should not be captured with impression compound?

Answer 6

teeth

Question 7

how would you prepare a tray with impression compound on it?

Answer 7

brush alginate adhesive onto the compound tray

use alginate to was over the compound and fill tray

Question 8

what should be done once the impression has been taken?

Answer 8

rinse away gross debris and saliva to decontaminate

place in perform for 10 min to disinfect

Question 9

how should the impression be inspected?

Answer 9

good light
should be acceptable quality to
-record denture bearing areas
-facilitate design
-primary cast should be good enough to enable subsequent unambiguous articulation of the casts

Question 10

what is the last step in taking an impression?

Answer 10

label bag and write instructions of lab prescription card