1. Custom Trays Individualized trays for making final impressions
Made on a diagnostic cast

2. Purpose of a Custom Tray
Improve retention (border molded)
Minimize:
Impression material distortion
Uniform thickness
Rigid tray

3. Purpose of a Custom Tray
Minimize:
Tissue distortion
Less viscous material
Accurately adapted tray
Costs
less impression material used

4. Extension 3-4 mm short of the peripheral role
Diagnostic casts often overextended (irreversible hydrocolloid)

5. Block-Out Undercuts Baseplate wax Prevent tray from locking onto cast
Lubricate cast (Petroleum jelly or Alcote)

6. Wax Spacer Minimizes hydraulic pressures
Do not place relief over blockout
Already relief in those areas
Provides room for impression material

7. Auxiliary Handles Mandible
For stabilization
Orient the tongue
Area of 2nd premolars / 1st molars

8. Finish
Do not polish - adhesion
No holes until border molded

9. Custom Tray Videos
Outlines for Custom Trays
Custom trays

10. Border Molding Performed with Thermoplastic modeling compound Waxes
Impression materials

11. Heat Source for Compound
Hanau Torch for resoftening of borders already on tray
Bunsen Burner or Butane Torch for Initial
Softening of stick

12. Tray Wax Spacer
Remains in place during border molding procedures

13. Wax Spacer Keep out of hot water bath to prevent melting
Difficult to replace tray intraorally in the same position
Results in uneven border molding

14. Tempering Compound
Temper in a water bath ( °F) for several seconds
Prevent burning
Hot water bath will keep compound soft for an extended period

15. After Removal Chill in cold water
Trim excess over wax spacer or external material that is thicker than 4-5 mm
Clean debris from tray

16. Assessing Peripheral Role
Proper thickness
No overlap

17. Mandible
More difficult
Changing position of the floor of the mouth

18. Posterior Buccal Areas
Pull cheek upward while holding tray in place
Have patient suck cheeks inward while holding tray in place

19. Retromolar Pad
Should be covered (at least partially) to provide a seal and comfort to the patient

20. External Oblique Ridge
Don’t extend past
Palpate cheek at angle of the mandible
Smooth transition between mandible & border - not palpable

21. Buccal Extension
Look for fold in vestibule

22. Retromylohyoid Space Distolingual border can extend
Straight down from the retromolar pads
Anteriorly to varying degrees
Almost never angles posteriorly from retromolar pads

23. Posterior Lingual Areas
Denture should not lift with normal tongue movements

24. Border Molding Video