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CAD-CAM IN FPD

CAD-CAM IN FPD. TECHNOLOGICAL TRENDS IN DENTISTRY. Information systems Treatment systems. INTRAORAL IMAGING SYSTEM . COMPUTER IMAGING SYSTEM . CAD-CAM SYSTEM. DIGITAL RADIOGRAPHIC SYSTEM. COMPUTERIZED PERIODONTAL PROBE. RADIOGRAPHIC IMAGE PROCESSING SYSTEM. TREATMENT SYSTEMS .

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CAD-CAM IN FPD

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  1. CAD-CAM IN FPD www.rxdentistry.net

  2. www.rxdentistry.net

  3. TECHNOLOGICAL TRENDS IN DENTISTRY Information systems Treatment systems www.rxdentistry.net

  4. INTRAORAL IMAGING SYSTEM www.rxdentistry.net

  5. COMPUTER IMAGING SYSTEM www.rxdentistry.net

  6. CAD-CAM SYSTEM www.rxdentistry.net

  7. DIGITAL RADIOGRAPHIC SYSTEM www.rxdentistry.net

  8. COMPUTERIZED PERIODONTAL PROBE www.rxdentistry.net

  9. RADIOGRAPHIC IMAGE PROCESSING SYSTEM www.rxdentistry.net

  10. TREATMENT SYSTEMS Abrasive system Laser system www.rxdentistry.net

  11. CAD-CAM SYSTEM Acronym for computer aided designing and computer aided milling or machining. www.rxdentistry.net

  12. BRIEF HISTORY • Increasing demand • Restoration at a single appointment • Development- began in 1970’s with Duret in France. • French system - in 1983 by Dr.Francois Duret www.rxdentistry.net

  13. On September 19, 1985, the first ceramic inlay was produced- at the dental Institute of the University of Zurich. • Mormann 1985 in Zurich, Switzerland www.rxdentistry.net

  14. www.rxdentistry.net

  15. www.rxdentistry.net

  16. FUNDAMENTAL PRINCIPLES OF CAD/CAM SYSTEM CSD CAD CAM www.rxdentistry.net

  17. ADVANTAGES • One visit restoration • Time saving • Improved esthetics • Good morphology • Improved crown fit www.rxdentistry.net

  18. Excellent polish • Less fracture due to single homogenous block • Wear hardness similar to enamel (Craig 1980) • Minimize cross infection • Good patient acceptance www.rxdentistry.net

  19. DISADVANTAGES • Need for costly equipment • Need for extended training • Technique sensitive • Inability to image in a wet environment www.rxdentistry.net

  20. MACHINABLE CERAMIC MATERIALS • Dicor MGC • Vita Mark II • Inceram Alumina • Inceram Spinell • Inceram Zirconia • Pro-Cad • Procera Allceram www.rxdentistry.net

  21. www.rxdentistry.net

  22. CERAMIC BLOCKS • Available in wide range of shades and sizes • More homogenous • Less porous • Mounted on a metal stub www.rxdentistry.net

  23. Effects of surface finish and fatigue testing on the fracture strength of CAD-CAM and pressed – ceramic crown (Hickel - JPD 1999) Purpose To determine the fracture strength of various all ceramic crowns with and without cyclic loading. www.rxdentistry.net

  24. Material & Method Machinable ceramic material, Vita Mark II and ProCAD and conventional heat-pressed IPS – Empress crowns were fabricated, with either a polished or an oven – glazed surface finish. Cyclic loading that simulated oral conditions were performed on half of each group. www.rxdentistry.net

  25. Conclusion The Cerec Pro-CAD crowns had significantly greater strength than the Vita Mark II crowns, better resistance to cyclic loading and lower failure probability than laboratory fabricated IPS empress crowns. www.rxdentistry.net

  26. Cyclic loading significantly reduced the strength of all-ceramic crowns, but had less effect on cerec crowns than on the IPS Empress crowns. Oven-glazing of ProCAD crowns resulted in significantly higher strength and higher resistance to cyclic loading than surface polishing. www.rxdentistry.net

  27. An upto 5 year Clinical Evaluation of posterior In-ceram CAD/CAM core crowns (Mormann – Int. J Prosthodont 2002) Evaluated the clinical performance of posterior CAD-CAM generated In-ceram alumina and In-ceram spinelll core crowns using the corec 2 CAD-CAM system and after 5 years of service concluded that the clinical quality of CAD-CAM generated In-ceram Alumina and In-ceram Spinell posterior crowns was excellent www.rxdentistry.net

  28. CLINICAL PROCEDURE Preparation Design Optical Impression Computer generated restoration design Milling Polishing and cementation     www.rxdentistry.net

  29. PREPARATION DESIGN www.rxdentistry.net

  30. OPTICAL IMPRESSION • Lacks reflectivity • Special Powder • Rubber dam www.rxdentistry.net

  31. www.rxdentistry.net

  32. COMPUTER GENERATED RESTORATION DESIGN • Restoration is designed • Operator moves the cursor • 3-D image • Design phase – 2 – 8 min. www.rxdentistry.net

  33. MILLING • Computer selects • Block is inserted • Milling device is activated • Three axis of rotation cutting machine www.rxdentistry.net

  34. www.rxdentistry.net

  35. PROCESSING TIME www.rxdentistry.net

  36. POLISHING • Rough ceramic surfaces are smoothed with clean white stones • Polished with - Rubber wheel of fine grit - Diamond impregnated wheels & points www.rxdentistry.net

  37. CEMENTATION • Composite resin cement • Zinc phosphate • Glass ionomer • Ceramic restoration that have been etched internally and bonded with a composite resin cement are 50% stronger than similar restoration cemented with zinc phosphate cement (Ludwig 1994) www.rxdentistry.net

  38. Effects of Preparation and Luting system on All-ceramic computer generated crowns (Mormann – Int. J Prosthodont 1998) Examined the effect of inside crown form on fracture strength of cemented and bonded crowns. • Four preparation types were used www.rxdentistry.net

  39. Machined crown were placed on abutments a. Without any media as control group b. Cemented with zinc phosphate c. Bonded And were loaded until fracture www.rxdentistry.net

  40. RESULTS • Zinc phosphate cemented crowns showed significant increase of fracture load values compared to uncemented control crowns. • Fracture load values of bonded crowns were significantly higher than those for cemented crowns. • Bonded crowns with thick occlusal dimension showed the highest fracture load values. www.rxdentistry.net

  41. He concluded that bonded all ceramic CAD-CAM crowns with defect oriented inside morphology and increased occlusal dimension showed high fracture load values. www.rxdentistry.net

  42. CEREC CAD/CAM SYSTEM • PROCERA CAD/CAM SYSTEM • TITAN CAD/CAM SYSTEM • CELAY CAD/CAM SYSTEM • CICERO CAD/CAM SYSTEM • LAVA CAD/CAM SYSTEM www.rxdentistry.net

  43. CEREC SYSTEM • Chair side economical reconstruction of esthetic ceramic. - Cerec – 1985 - Cerec 2 – 1996 - Cerec 3 – Feb’ 2000 www.rxdentistry.net

  44. CEREC CAD-CAM SYSTEM Limitation • Cannot mill the occlusal surface • Only inlays and onlays www.rxdentistry.net

  45. CEREC – 2 CAD-CAM SYSTEM • Milling of occlusal surface possible • Inlays, Onlays, veneers and crowns • Milling time approx. 10min www.rxdentistry.net

  46. The grinding precision of the cerec-2 is 2.4 times higher than cerec system (Mormann 1997) www.rxdentistry.net

  47. CEREC – 3 CAD-CAM SYSTEM • Advanced version • Technical improvements • Designing and grinding- less time (27%) • Grinding unit – 2 cutters www.rxdentistry.net

  48. www.rxdentistry.net

  49. Marginal and Internal Fit of Cerec 3 Cad/CAM All Ceramic Crowns (Kojima – Int. J Prosthodont 2003) Examined the effect of the occlusal convergence angle of the abutment and the computer luting space setting on the marginal and internal fit of cerec 3 CAD-CAM all ceramic crowns. Mandibular second premolar all ceramic crowns were fabricated for nine different conditions using cerec-3 CAD-CAM system www.rxdentistry.net

  50. Occlusal convergence angle of 4,8 and 12° • Luting space settings of 10, 30 and 50µm. www.rxdentistry.net

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