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

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Presentation on theme: "Custom Trays Individualized trays for making final impressions Individualized trays for making final impressions Made on a diagnostic cast Made on a diagnostic."— Presentation transcript:

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

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

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

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

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

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

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

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

9 Custom Tray Videos Outlines for Custom Trays Custom trays

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

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

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

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

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

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

16 Assessing Peripheral Role Proper thickness Proper thickness No overlap No overlap Proper thickness Proper thickness No overlap No overlap

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

18 Posterior Buccal Areas Pull cheek upward while holding tray in place Pull cheek upward while holding tray in place Have patient suck cheeks inward while holding tray in place Have patient suck cheeks inward while holding tray in place Pull cheek upward while holding tray in place Pull cheek upward while holding tray in place Have patient suck cheeks inward 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 Should be covered (at least partially) to provide a seal and comfort to the patient

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

21 Buccal Extension Look for fold in vestibule Look for fold in vestibule

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

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

24 Border Molding Video


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