Upper partial special tray

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Upper partial special tray

  1. 1. Week 4 Sessions 1>3 Unit 6ADT4305
  2. 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. 3. Session 1 Upper special tray for partially dentate case
  4. 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. 5. Apply a SECOND sheet and cut back to the line Cut tray stops into the wax as shown here
  6. 6. Before adding the sheet of tray material, fill the tray stop holes with some off-cuts of tray material
  7. 7. Adapt a sheet of tray material to cover the wax. AVOID THINNING AT THE PERIPHERY
  8. 8. 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
  9. 9. Draw a pencil line along the tray at the same angle as the frena. Trim away a rounded notch to allow space around it.
  10. 10. 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
  11. 11. Rest your work on the bench page when cutting perforations and during trimming
  12. 12. 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
  13. 13. Session 2 Lower special tray for partially dentate case
  14. 14. Apply a SINGLE wax spacer accurately over the model. Adapt TIGHTLY
  15. 15. Apply a SECOND sheet and cut back to the line
  16. 16. Before adding the sheet of tray material, fill the tray stop holes with some off-cuts of tray material
  17. 17. Adapt a sheet of tray material to cover the wax. AVOID THINNING AT THE PERIPHERY Cut tray stops into the wax as shown here
  18. 18. 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
  19. 19. Cross-section through tray. The spacer is boiled away leaving a clear space for the impression material.
  20. 20. Session 3 Upper special tray for partially dentate implant case
  21. 21. After the second wax spacer has been applied, add some wax blocks in th 5-6 region. Make them higher than the teeth
  22. 22. Cut windows around the wax blocks to allow the implant impression analogues to protrude through the tray in the clinic.
  23. 23. Cure, boil away wax spacer trim and finish as before

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