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Impression Materials Part - 1
- 2. Impression
- 3. Impression • An impression is an exact negative replica of the oral structure with an accurate reproduction of all the finer details maintaining the correct spatial dimensions.
- 4. Purpose of Making Impression • Many dental appliances are constructed outside the patient’s mouth on a cast of hard and / or soft tissues. As the fabrication required many laboratory procedures and the patient cannot be asked to sit in dental office during this considerable period of fabrication.Therefore, they are constructed on the cast in the absence of patient.The accuracy of fit and the functional efficiency of the appliance depend upon how well the cast replicates the natural oral tissues.The accuracy of the cast depends on the accuracy of the impression in which it was cast.
- 5. Armamentarium for conventional impression •Tray •Impression material •etc
- 9. Classification of ImpressionTrays Based on Availability Stock Custom Need of retention Perforated Non perforated Special tray patient’s arch shape and size U1, U2, U3, U4 L1, L2, L3, L4 Edentulousim Dentulous Edentulous Locking Rim locked Perforated Non perforated Extension Sectional Full arch
- 10. How many impressions r needed for CD
- 11. Stock tray
- 12. Primary impression and primary cast
- 13. Secondary Impression with ZOE
- 14. v
- 15. Master cast after trimming
- 16. Impression Diagnostic Primary/diagnostic Secondary/ final Recent advancement Intraoral scanner
- 17. Digital impression • Scanning equipment
- 19. Classification of impression Technique Mucostatic Mucompressive Selective pressure Stage Primary Secondary Extension Sectional Full arch Consistency Rigid Elastic Treatment CD FPD CPD Implant
- 20. Classification of impression materials setting mechanism Inelasticity elasticity
- 21. REQUIREMENTS • Biological Requirements • Chemical Requirements • Rheological Requirements • Mechanical Requirements • Thermal Requirements • Esthetic Requirements • Minor Requirements
- 22. REQUIREMENTS Biological Biocompatibility Disinfection Chemical Requirements Inertness Moisture compatibility Rheological Fluidity and viscosity Mucostatic MucoCompressive Pseudoplasticity Mechanical Accuracy Elasticity Tear strength Thermal Thermal conductivity Coefficient of thermal expansion Esthetic Color contrast Minor Requirements Acceptable taste & odor Shelf-life Economic Availability Easy manipulation Sterilization
- 27. Rim locked perforated Rim locked sectional perforated Rim locked non perforated Dentulous perforated edentulous perforated Dentulous perforated sectional edentulous non perforated Triple tray Stock trays for implant
- 30. MIND MAPPING
- 31. Impression Types of impression Requirements of impression Types of trays Difference b/w stock and custom tray Difference b/w primary and secondary impression Classification impression Classification of impression material Digital impression
- 32. Is prostho limited to oral cavity????