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Final Impressions for Complete Dentures

Final Impressions for Complete Dentures. Polyvinyl Siloxanes Addition Reaction Silicone. Hydrophobic Newer materials more hydrophilic Similar to Polysulfides & Polyethers Flow Thixotropic Require pressure to flow . Polyvinyl Siloxanes Addition Reaction Silicone.

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Final Impressions for Complete Dentures

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  1. Final Impressions for Complete Dentures

  2. Polyvinyl Siloxanes Addition Reaction Silicone • Hydrophobic • Newer materials more hydrophilic • Similar to Polysulfides & Polyethers • Flow • Thixotropic • Require pressure to flow

  3. Polyvinyl Siloxanes Addition Reaction Silicone • Good dimensional stability • Excellent elastic recovery • Excellent dimensional accuracy • Material of choice

  4. Wax Spacer Removal • After border molding, remove wax spacer • Do not dislodge border molding

  5. Custom Trays • Smooth sharp surfaces of border molding or tray

  6. Effect of Sharp Borders

  7. Custom Trays • Place holes in tray to allow release of hydraulic pressure

  8. Adhesive • Paint inside of tray & border molding • Allow to dry 7-15 minutes

  9. Final Impressions • Dry tissues with 2x2 gauze folded in cotton pliers

  10. Tissue Rest • Leave dentures out 24 hours • Tissue recovery • Use low viscosity polyvinyl siloxane material • Use adhesive

  11. Tray Insertion • Insert side of tray against commissure of mouth & rotating the tray into place while pulling outward on the commissure of the contralateral side

  12. Final Impressions Subsurface Voids Tech. Dentist A B C TOTAL F-B 3 2 1 6 Even 4 3 6 13 B-F 6 4 3 13 __________________________ TOTAL 13 9 10 32 • Seat tray front to back - use gauze over holes in tray • Ensure tray is centered & properly oriented

  13. Tissue ManipulationMaxilla • Slight manipulation of cheeks, lips • Patient moves mandible to side to side for maxillary impression

  14. Tissue ManipulationMandible • Hold tray in position & have patient: • Pucker lips • Lift & move tongue forward & side to side

  15. Impressions Videos Final Impressions Two Mirror Impression Technique

  16. Set Time • Most polyvinyl siloxane materials set within 6 minutes

  17. Evaluating Impression Video

  18. Post-palatal Seal • Compensates for polymerization shrinkage away from palate • Enhances retention

  19. Post-palatal Seal • Mark post-palatal seal with indelible stick – Glandular area & vibrating line • Place impression in mouth, line transfers to impression

  20. Post-palatal Seal • Disinfect • Refresh the line with new indelible stick • Prescribe a mechanical post-palatal seal • Pour impression in Type III stone (ie. Microstone)

  21. Boxing Final ImpressionsRationale • Superior hardness of cast surface • Provides land area & preserves peripheral role • Minimizes trimming

  22. Trimming the Cast

  23. Trimming the CastLand Area = 4mm Wide

  24. Boxing Impression Video

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