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Impression Material

Impression Material. IMPRESSION MATERIALS, TYPES and TRAYS. Impression are negative reproduction of teeth and surrounding structure Preliminary Impression done by the assistant poor dimensional stability stock impressions trays Final Impressions done by the doctor only

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Impression Material

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  1. Impression Material

  2. IMPRESSION MATERIALS, TYPES and TRAYS • Impression are negative reproduction of teeth and surrounding structure • Preliminary Impression • done by the assistant • poor dimensional stability • stock impressions trays • Final Impressions • done by the doctor only • good dimensional stability • stock impressions trays /custom trays

  3. Preliminary Impression Material • Irreversible Hydrocolloid/Alginate • Thermo-dots • Polyvinylsiloxane Condensation material • Uses: • Diagnostic models • Opposing arch models • Fabrication of custom trays • Fabrication of provisional restorations

  4. IMPRESSION TRAYS • Full arch • custom made • preformed plastic • perforated rim lock • max/mand • Quadrant • custom made • preformed plastic • perforated rim lock • Triple Tray • quadrant • sextant • take upper and lower in one • Sextant Tray • custom made • preformed plastic • perforated rim lock • ant/post

  5. INITIAL IMPRESSIONS • Negative is poured in gypsum to create a positive model. • Models can be articulated together, articulator recreates the TMJ. • Models can be used as opposing for bite registration

  6. FINAL IMPRESSIONS • Negatives poured in gypsum to create positive model • Models are articulated together and the prep tooth is cut out of the model to create a die • A die is a replication of the prepared tooth or teeth or the edentulous mouth

  7. CUSTOM TRAYS • Acrylic light cured or self cured resin material • need a polymer and monomer • polymerization = setting

  8. CUSTOM TRAYS • Vacuum formed custom trays • resin sheets are heated and formed over the initial impression using heat and vacuum

  9. CUSTOM TRAYS • Thermoplastic tray material • beads or buttons that are pliable when heated

  10. Preformed rim lock • Locks impression material into tray

  11. Preformed Plastic • Need tray adhesive

  12. Triple Trays • Takes final impression, opposing impression, and bite registration

  13. CUSTOM TRAYS • Acrylic resin tray • Much like the thermoplastic beads • Needs spacer and stops because of the custom fit • Spacer can be pink wax, aluminum foil or wax paper

  14. ELASTOMERIC MATERIALS • Rubberlike qualities • Used when precise duplication is needed • No distortion, great dimensional stability • Supplied in a two paste system • base and catalyst • Supplied in either a two tube system or extruder gun • Can be one or multiple body types

  15. Polysulfide • Advantages • good stability,accuracy • sharpness in detail • light = syringe, wash medium, heavy = tray material • long shelf life • used for crown, bridge, partial, denture impressions • Disadvantages • stains, tastes bad and stinks • ten minute setting time

  16. Polyether • Advantages • excellent accuracy • great dimensional stability • medium body only, used as both syringe and tray material • used for crown, bridge, denture and partial impressions • Disadvantages • only one body type

  17. Silicone • Polysiloxane • Condensation – putty • used for bite registration, custom tray • Polyvinylsiloxane • addition silicone • advantages • high degree of accuracy and dimensional stabilty • three body types • disadvantages • expensive

  18. Bite Registration • Polysiloxane bite registration material • open bite (shown) • closed bite • Wax bite registration material • pink wax • horseshoe wax • bees wax • aluwax

  19. Preparation for Impression • Select material • Select type of tray or trays • Obtain an opposing arch, if necessary • Apply adhesive as directed to impression tray • Mix syringe material, deliver to provider • Mix tray material, place in tray and deliver to provider • Remove impression. disinfect and evaluate • Prepare provisional if necessary

  20. What to send to Lab • Lab slip • Final Impression • Opposing arch • Bite registration • It is important to give the lab tech everything they will need to produce a quality product

  21. Deliver Appointment • Prosthetic should be due two days before appointment. • Any adjustments can be done outside the mouth before cementation or placement • Final adjustment of cemented appliance can be done in the mouth • Oral hygiene instructions

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