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Prosthetics II.

Prosthetics II. Fixed dentures Inlay, root canal inlay. Fixed dentures. Cemented (fixed) on/in pilots, abutment teeth. Inlays (inlays, onlays, overlays, partial crowns). Crowns Bridges. Inlays. Composit , cermic Metal. Fixed dentures.

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Prosthetics II.

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  1. Prosthetics II. Fixeddentures Inlay, rootcanal inlay

  2. Fixed dentures • Cemented (fixed) on/in pilots, abutment teeth. • Inlays (inlays, onlays, overlays, partial crowns). • Crowns • Bridges

  3. Inlays Composit, cermic Metal

  4. Fixed dentures • Cemented on the teeth – crowns, bridges, inlays Fixed bridge

  5. Fixeddentures • Material – metal alloy, ceramics

  6. Removabledentures • Partial • Complete (full)

  7. Procedures • In dental surgery • In dental laboratory • Special instruments • Basic (main) materials (metal alloys, ceramics,polymers) • Auxilliary (accessory) materials (impression, carving, die, insulating investing, grinding, polishing)

  8. Manufacturing of dentures Model of gypsum (plaster) – model of a denture (wax pattern). Model of a denture (wax pattern) directly in the mouth – rarely. Denture is formed without a wax pattern in the dental lab.

  9. Manufacturing of dentures Model of gypsum (plaster) – model of a denture (wax pattern).

  10. Impressions of the jaw - negativ The impression is filled with a casting material (gypsum) – poured into Model (various purpose)

  11. Models • Working model – the denture is produced on this model (special procedures) • Opposing model (antagonal) - necessary for the recognition of intermaxillary relationship • Bite regitration - wax

  12. Manufactoring of dentures • The denture (not the denture itself but the model of the denture) is produced on the working model. • The model of the denture is made of the carving wax. • The wax is replaced by the main (base) material.

  13. Fabrication of dentures The model (wax) of the denture is invested The wax is removed from the form and the base material is placed into the form. Wax removal: The wax is burned out (for metal alloys) or removed by hot water (for polymers)

  14. Impression material Impression Tooth

  15. Gypsum Impression

  16. Plaster

  17. The model (wax pattern)

  18. The investing material The model (wax pattern)

  19. The melted alloy The investing material The form

  20. The melted alloy The investing material The crown

  21. The metal crown Plaster

  22. Manufacturing of dentures The method described above = indirect method

  23. Manufacturing of dentures Direct method

  24. Manufacturing of dentures Direct method No impression The model of the denture is made directly in the mouth For inlays only

  25. Inlays • Rigid fillings • Manufactured in a dental lab • Direct or indirect method • Direct method rarely • Indirect method most common

  26. Inlay • Crown inlay - a part of a clinical crown is replaced • Root canal inlay - The inlay is cemented into the root canal and replaces a crown (abutment tooth – stump, snag)

  27. Crown inlay Material • Composit • Ceramics • Metal Alloys

  28. Angle of convergence • 0° - maximum • 6° - very good • 15°- acceptable • 20° - insuficient Optimum 6° - 15°.

  29. Crown inlays Indikations • A big lost of dental tissues • Big interdental spaces • Next to the crowns and bridges made of metal alloy

  30. Crown inlays Contra - indication • Too small - shallow (flat) cavities • High caries risk • Frontal area (metallic)

  31. Inlay

  32. Onlay

  33. Overlay

  34. Partial crown

  35. Korunka Crown

  36. Retention of rigid fillings Whitstand capability against axial forces: Geometry of the preparation (facilitating shape) Quality of the luting material

  37. Retention g/mm2 Angle of the convergence Outer or inner conus Rau G. 1994

  38. Retaining areal • Surface of contact Rigid filling Inlay or crown (internal, outer, combined)

  39. Stability of rigid fillings Whitstand capability against horizontal forces Angle of convergence Axial length contact surface

  40. Basic rules of cavity preparation • Box • No undercuts • Light divergence of the walls (facilitating shape)

  41. Box Undercuts Simple box Facilitating form

  42. Inlay of metal alloy • Direct method • Indirect method

  43. Inlay of metal alloy • Direct method Direct modellation in the mouth Special wax – casting wax, (special polymers) Sprue pin Investment Method of the lost wax

  44. Inlay of metal alloy Direct method • Central cavities (class I., classs V.) • Root canal inlays

  45. Inlay of metal alloy Indirect method Taking of the impression Model Modellation of the casting wax, (special polymers) Sprue pin Investment Method of the lost wax

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