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Custom Trays

Custom Trays. Individualized trays for making final impressions Made on a diagnostic cast. Purpose of a Custom Tray. Improve retention (border molded) Minimize: Impression material distortion Uniform thickness Rigid tray. Purpose of a Custom Tray. Minimize: Tissue distortion

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Custom Trays

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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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