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Complete_Denture_Lab_Steps_Presentation_With_Images.pptx
- 1. Laboratory Steps of CompleteDenture Designing the Polished Surface, Flasking, Packing, and Processing Assel Alrifaie 210801281
- 2. Introduction • Complete denturesare prostheses that replace the entire dentition. • Laboratory steps include: • - Designing the polished surface • - Flasking • - Packing • - Processing
- 3. Designing the PolishedSurface • Definition: The outer surface of the denture contacting lips, cheeks, and tongue. • Importance: • - Provides stability and retention • - Supports proper muscle balance • - Aids in esthetics and hygiene
- 4. Designing the PolishedSurface - Principles • - Maxillary: Convex surface, supports lips & cheeks • - Mandibular: Proper tongue space, neutral zone • - Proper contours prevent food accumulation • - Must be smooth and easy to clean
- 5. Flasking • Definition: Investingthe waxed denture and cast in a flask with dental stone to form a mold. • Flask parts: • - Cap (top) • - Cope (middle) • - Drag (bottom)
- 6. Flasking - Steps(Part 1) • 1. Soak master cast • 2. Place cast in lower flask with dental stone • 3. Apply separating medium • 4. Position upper part of flask
- 7. Flasking - Steps(Part 2) • 5. Add second mix of stone over waxed denture • 6. Fill flask completely with stone • 7. Close flask and allow stone to set
- 8. Devaxing • • Flaskplaced in boiling water (4 min) • • Open flask and remove softened wax • • Residual wax cleaned with solvent • • Apply separating medium to mold surface
- 9. Separating Media • •Prevents resin from sticking to stone • • Types: • - Sodium alginate solution (most common) • - Tinfoil • - Cellulose lacquers • - Soaps • Failure distortion and porosity →
- 10. Packing • Definition: Placementand adaptation of denture base resin into the mold cavity. • Critical for fit and strength of denture.
- 11. Packing - Steps •1. Mix polymer and monomer to dough stage • 2. Roll into rope shape and place in mold • 3. Trial closure under press • 4. Remove excess resin (flash) • 5. Final closure of flask
- 12. Packing - Errors •• Too much resin thick denture base, malposition → of teeth • • Too little resin porosity and voids →
- 13. Processing • Definition: Polymerizationof denture base resin under controlled heat. • Goal: Proper curing with minimal shrinkage or porosity.
- 14. Processing - LongCure • • Water bath at 74°C for 8 hours • • No terminal boil • • Produces strong, accurate denture bases
- 15. Processing - ShortCure • • 74°C for 2 hours, then 100°C for 1 hour • • Faster method • • May increase porosity risk if rushed
- 16. Processing - InjectionMolding • • Resin injected into mold under pressure • • Maintains vertical dimension of occlusion • • More accurate adaptation • • Example: Ivocap system
- 17. Processing - Microwave Technique •• Uses special flask with resin and screws • • 3 minutes microwave curing • • Faster and energy efficient • • Produces good results with less water absorption
- 18. Deflasking - Step1 • • Bench cool flask for 30 minutes • • Immerse in cool water for 15 minutes
- 19. Deflasking - Step2 • • Carefully separate stone and retrieve denture • • Avoid damaging the denture base or cast
- 20. Finishing • • Removeexcess resin and smooth rough surfaces • • Polish polished surfaces for esthetics and hygiene
- 21. Importance of EachStep • • Designing polished surface stability & → retention • • Flasking accurate mold → • • Packing proper fit and strength → • • Processing durability & biocompatibility →
- 22. Common Errors • •Incomplete wax removal • • Poor separating medium application • • Over/under-packing resin • • Inadequate curing cycle
- 23. Clinical Relevance • Laboratoryaccuracy ensures: • - Good fit • - Comfort for patient • - Esthetics • - Long-term durability
- 24. Conclusion • Complete denturesuccess depends on precise lab procedures. • Flasking, packing, and processing must be done carefully to ensure a functional and esthetic denture.
- 25. References • • 12-Flaskingof Complete Dentures (provided file) • • Prosthodontics textbooks (Complete Denture) • • Pocket Dentistry, Chapter 19