1. Week 4 Sessions 1>3
Unit 6ADT4305

2. A 3mm wax spacer is
applied to the model.
A tray is then made
over it. When the wax
is boiled away, the
space permits an even
thickness of alginate
impression material
inside the tray.

3. Session 1
Upper special tray for partially
dentate case

4. Draw a clear pencil line around the
depth of the sulcus. Allow movement
of the frena
Apply a SINGLE wax spacer accurately
over the model. Adapt TIGHTLY

5. Apply a SECOND sheet and cut back to
the line
Cut tray stops into the wax as shown
here

6. Before adding the sheet of tray
material, fill the tray stop holes with
some off-cuts of tray material

7. Adapt a sheet of tray material to
cover the wax. AVOID THINNING AT
THE PERIPHERY

9. Cure for 5 minutes then place in the
boiling out machine to remove the
wax. Remove tray and flush with hot
water
The tray stops can now be seen
clearly here

10. Draw a pencil line along the tray at
the same angle as the frena.
Trim away a rounded notch to allow
space around it.

11. Draw dots 8mm apart and no closer
than 5mm to the periphery
Don’t cover the occlusal
surface to allow
compression of the
material over the teeth
Keep your fingers OUT of the tray when cutting perforations.
You REALLY don’t want a TC bur going through your nail at 15,000rpm

12. Rest your work on the
bench page when cutting
perforations and during
trimming

13. Round the periphery over.
FEEL if it is sharp!
Use your sense of touch here …
This cross-section through a finished
lower tray shows how the tray stops
prevent the tray from sinking

14. Session 2
Lower special tray for partially
dentate case

15. Apply a SINGLE wax spacer accurately
over the model. Adapt TIGHTLY

16. Apply a SECOND sheet and cut back to
the line

17. Before adding the sheet of tray
material, fill the tray stop holes with
some off-cuts of tray material

18. Adapt a sheet of tray material to
cover the wax. AVOID THINNING AT
THE PERIPHERY
Cut tray stops into the wax as shown
here

20. Draw dots 8mm apart and no closer
than 5mm to the periphery
Don’t cover the occlusal surface to
allow compression of the material
over the teeth

21. Cross-section
through tray.
The spacer is boiled away
leaving a clear space for
the impression material.

22. Session 3
Upper special tray for partially
dentate implant case

24. After the second wax
spacer has been applied,
add some wax blocks in th
5-6 region. Make them
higher than the teeth

25. Cut windows around the
wax blocks to allow the
implant impression
analogues to protrude
through the tray in the
clinic.

26. Cure, boil away wax
spacer trim and finish as
before