Primary Impressions

Question 1

what is the first step of primary impressions?

Answer 1

examine the patient and estimate the size of the tray

Question 2

what may you use to help with impression materials in cases with a free end saddle?

Answer 2

impression compound to capture the saddle areas

Question 3

what does impression compound do?

Answer 3

stabilises tray, supports the alginate material

Question 4

for lower free end saddles what do you do?

Answer 4

customise the saddle area of the tray using impression compound, do not capture the teeth as part of the compound impression, brush alginate adhesive onto compound tray, use alginate to wash over the compound and fill the tray

Question 5

what do you do for upper free end saddles?

Answer 5

customise the saddle area of the tray using impression compound, do not capture teeth as part of the compound impression, remove excess compound and brush alginate adhesive onto the compound tray, use alginate to wash over the compound and fill the tray

Question 6

what do you do once the impressions are taken?

Answer 6

decontaminate the impressions - place in perform for 10mins to disinfect

Question 7

what should you be able to see when inspecting the impression

Answer 7

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

Question 8

summarise the steps of primary impression

Answer 8

select tray and modify peripheries with wax or compound, apply adhesive and use alginate, disinfect and then place in sealed bag with wet cotton wool, label bag and write instructions on laboratory prescription card