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Crafting Custom Trays for Precision Impressions

Learn to make custom trays on diagnostic casts for accurate impressions. Explore techniques like border molding and wax spacers to minimize material distortion and ensure uniform thickness. Watch our tutorial videos for detailed guidance.

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Crafting Custom Trays for Precision Impressions

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  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 (135-140°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

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