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

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    17-Dec-2015
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Transcript of Custom Trays Individualized trays for making final impressions Made on a diagnostic cast...

  • Slide 1
  • Custom Trays Individualized trays for making final impressions Made on a diagnostic cast Individualized trays for making final impressions Made on a diagnostic cast
  • Slide 2
  • Purpose of a Custom Tray Improve retention (border molded) Minimize: Impression material distortion Uniform thickness Rigid tray Improve retention (border molded) Minimize: Impression material distortion Uniform thickness Rigid tray
  • Slide 3
  • Purpose of a Custom Tray Minimize: Tissue distortion Less viscous material Accurately adapted tray Costs less impression material used Minimize: Tissue distortion Less viscous material Accurately adapted tray Costs less impression material used
  • Slide 4
  • Custom Material Light-cure resins (Triad) Auto polymerizing acrylic resin (e.g. SR-Ivolin) Fume hood Vacuum-form poly vinyl Thermoplastic materials Light-cure resins (Triad) Auto polymerizing acrylic resin (e.g. SR-Ivolin) Fume hood Vacuum-form poly vinyl Thermoplastic materials
  • Slide 5
  • Monomer Hygiene Autopolymerizing resins have a liquid monomer that should be used in a fume hood Light cure materials for students Autopolymerizing resins have a liquid monomer that should be used in a fume hood Light cure materials for students
  • Slide 6
  • Extension 3-4 mm short of the peripheral role Diagnostic casts usually overextended (irreversible hydrocolloid) 3-4 mm short of the peripheral role Diagnostic casts usually overextended (irreversible hydrocolloid)
  • Slide 7
  • Extension Outline the depth of vestibule vertical portion turns toward horizontal Through hamular notches across vibrating line Provide room for frenal attachments Outline the depth of vestibule vertical portion turns toward horizontal Through hamular notches across vibrating line Provide room for frenal attachments
  • Slide 8
  • Block-Out Undercuts Baseplate wax Prevent tray from locking onto cast Lubricate cast (Petroleum jelly or Alcote) Baseplate wax Prevent tray from locking onto cast Lubricate cast (Petroleum jelly or Alcote)
  • Slide 9
  • Wax Spacer One thickness of base plate wax over the cast Trim line in vestibule Trim tobutterfly configuration glandular tissue One thickness of base plate wax over the cast Trim line in vestibule Trim tobutterfly configuration glandular tissue
  • Slide 10
  • Wax Spacer Minimizes hydraulic pressures Do not place relief over blockout Already space from tissue Provides room for impression material Minimizes hydraulic pressures Do not place relief over blockout Already space from tissue Provides room for impression material
  • Slide 11
  • Triad Resin Light-cure Heat will melt wax spacer Cure under water Cures on exposure to ambient light Light-cure Heat will melt wax spacer Cure under water Cures on exposure to ambient light
  • Slide 12
  • Triad Resin Exposed surface has air inhibited layer Air Barrier Coating Cytotoxic Must be thoroughly removed Cure under water Exposed surface has air inhibited layer Air Barrier Coating Cytotoxic Must be thoroughly removed Cure under water
  • Slide 13
  • Triad Resin Wear gloves to minimize exposure to material Hypersensitivity potential minimal Wear gloves to minimize exposure to material Hypersensitivity potential minimal
  • Slide 14
  • Tru-Tray Material Remove from wrapper Adapt the resin over the spacer Palatal area adapted first Remove from wrapper Adapt the resin over the spacer Palatal area adapted first
  • Slide 15
  • Large Casts Use portion of another sheet Adapt well until seam is gone Reclose material in wrapper, tape shut Infection control Use portion of another sheet Adapt well until seam is gone Reclose material in wrapper, tape shut Infection control
  • Slide 16
  • Tru-Tray Material Trim excess with a scalpel, then readapt Cut down through resin Pulling blade will tear resin Trim excess with a scalpel, then readapt Cut down through resin Pulling blade will tear resin
  • Slide 17
  • Trimming the Tray
  • Slide 18
  • Handle Addition Small vertical handle Does not pull vestibule Add before curing Small vertical handle Does not pull vestibule Add before curing
  • Slide 19
  • Auxiliary Handles Mandible For stabilization Orientation the tongue Area of 2nd premolars / 1st molars For stabilization Orientation the tongue Area of 2nd premolars / 1st molars
  • Slide 20
  • Curing in Water Prevents wax meltdown Water hazard Ensure: Top of container well sealed Outer container surface dry Prevents wax meltdown Water hazard Ensure: Top of container well sealed Outer container surface dry
  • Slide 21
  • Cure Time 4 minutes Cooling effect of water may extend cure time 4 minutes Cooling effect of water may extend cure time
  • Slide 22
  • Finish Arbor-bands and acrylic burs Round and smooth edges Mask and eye protection Arbor-bands and acrylic burs Round and smooth edges Mask and eye protection
  • Slide 23
  • Finish Do not polish - adhesion No holes until border molded Do not polish - adhesion No holes until border molded
  • Slide 24
  • Tray for Border Molding with Partner More difficult than edentulous border molding Removal from teeth & undercuts Easier to lock in place Hybrid design More difficult than edentulous border molding Removal from teeth & undercuts Easier to lock in place Hybrid design
  • Slide 25
  • Tray Design