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Tooth preparation for Metal ceramic crowns.

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Tooth preparation for Metal ceramic crowns.

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Tooth preparation for Metal ceramic crowns.

  1. 1. Metal Ceramic Crown Preparation
  2. 2. • Most widely used. • Improvement in: 05/21/16 2 Technology. Skills. Growing cosmetic demands.
  3. 3. • Complete coverage by metal. • Veneer porcelain mimics 3 Extention varies natural teethnatural teeth
  4. 4. Major requirement: 05/21/16 4 More amount of tooth reduction areas Metal veneered with ceramic. Place for - Metal - Porcelain Sufficient bulk. - Mask metal. - Esthetics.
  5. 5. Least conservative preparation. 05/21/16 5
  6. 6. 05/21/16 6
  7. 7. Other problems • Alloy’s compatibility with ceramics. 05/21/16 7 - Physical properties. - Adequate bond strength. High fusing range. Low thermal expansion.
  8. 8. Indications • Esthetic demands. • Durability More ( than all ceramic ). 05/21/16 8 Marginal fit better in all ceramics.
  9. 9. • Crown and bridges metal substrate. • Allows placement of rests, if RPD is a part of treatment. 05/21/16 9 connectors
  10. 10. • Extensive tooth destruction: • Correction of malocclusion. • Correction of occlusal plane. 05/21/16 10 - Caries. - Trauma - Existing restoration - Endodontically treated
  11. 11. Contra indications • Patient with active caries. • Untreated periodontal diseases. • Young patients with large pulp chambers. 05/21/16 11 Risk of pulp exposure - Porcelain laminates. - Composite laminates.
  12. 12. • If more conservative restoration is possible. • Long Spans. • If facial walls are intact. 05/21/16 12 Partial veneer is possible and favorable.
  13. 13. Advantages • Strength Good, compared to all ceramics • Mimic natural appearance Characterization • Good retention All axial walls are included. 05/21/16 13 Reinforcement and support to brittle ceramic. stains Intrinsic External.
  14. 14. Disadvantages • More amount of tooth removal. • Facial margins often Subgingivally • Inferior esthetics compared to all ceramics. 05/21/16 14 PDL disease Margins supra gingivally esthetics not a problem Indicated:
  15. 15. • Brittle fracture Poor design. • Difficulty design / shaping and shade matching. • Many procedural steps. • Expensive. 05/21/16 15 - Casting. - Porcelain adaptation.
  16. 16. 05/21/16 16
  17. 17. 05/21/16 17
  18. 18. Preparation • Guiding groves. • Incisal / Occlusal reduction. • Labial / buccal reduction. • Axial reduction • Final finishing. 05/21/16 18 Proximal . Lingual surfaces.
  19. 19. Anterior tooth preparation 05/21/16 Free Template from Brainybetty.com 19
  20. 20. 05/21/16 20 PUTTY INDEX
  21. 21. 05/21/16 Free Template from Brainybetty.com 21
  22. 22. 05/21/16 22
  23. 23. 05/21/16 Free Template from Brainybetty.com 23
  24. 24. Incisal bevel • Palatally directed Maxillary anteriors. • Buccaly directed Mandibular anteriors. 05/21/16 24
  25. 25. Incisal Preparation • Incisal edge 2mm reduction. 05/21/16 Free Template from Brainybetty.com 25 Adequate thickness Translucency
  26. 26. 05/21/16 Free Template from Brainybetty.com 26
  27. 27. 05/21/16 Free Template from Brainybetty.com 27
  28. 28. 05/21/16 Free Template from Brainybetty.com 28
  29. 29. 05/21/16 Free Template from Brainybetty.com 29
  30. 30. • Cervical plane of reduction determines • Incisal plane Provides space for porcelain veneer. 05/21/16 30 Path of withdrawal.
  31. 31. 05/21/16 Free Template from Brainybetty.com 31
  32. 32. 05/21/16 32
  33. 33. 05/21/16 33
  34. 34. 05/21/16 34
  35. 35. 05/21/16 Free Template from Brainybetty.com 35
  36. 36. 05/21/16 Free Template from Brainybetty.com 36
  37. 37. 05/21/16 Free Template from Brainybetty.com 37
  38. 38. 05/21/16 Free Template from Brainybetty.com 38
  39. 39. Lingually • Concavity • Use foot ball shaped bur / doughnut or any other suitable bur. 05/21/16 Free Template from Brainybetty.com 39 Adequate clearance Centric contacts
  40. 40. 05/21/16 40
  41. 41. 05/21/16 41
  42. 42. Wing preparation 05/21/16 42
  43. 43. 05/21/16 43
  44. 44. Variants • Wing less preparation. 05/21/16 Free Template from Brainybetty.com 44 No definite Trancession from chamfer to shoulder Shoulder gradually narrows lingually.
  45. 45. Prevention of trauma to pulp • Adequate coolant while preparing ( copious irrigation ). 05/21/16 45 • Intermittent strokes Preparation.
  46. 46. • Care while preparation of Subgingival margins 05/21/16 46 • Permanent gingival recession.
  47. 47. Finishing • Smooth glass like / satin like finish. • Rounden all line angles. • No scratches marks. • Use gingival retraction. 05/21/16 47
  48. 48. 05/21/16 48
  49. 49. POSTERIOR TOOTH PREPARATION
  50. 50. POSTERIOR METAL-CERAMIC CROWN
  51. 51. POSTERIOR METAL-CERAMIC CROWNS STEP NO : 1 OCCLUSAL REDUCTION FOLLOWED BY FUNCTIONAL CUSP BEVEL.barell
  52. 52. POSTERIOR METAL-CERAMIC CROWNS STEP NO : 2 DEPTH ORIENTATION GROOVES
  53. 53. POSTERIOR METAL-CERAMIC CROWNS STEP NO :3 FACIAL REDUCTION- OCCLUSAL HALF
  54. 54. POSTERIOR METAL-CERAMIC CROWN STEP NO :4 FACIAL REDUCTION GINGIVAL HALF
  55. 55. POSTERIOR METAL-CERAMIC CROWN STEP NO: 5 PROXIMAL AXIAL REDUCTION
  56. 56. POSTERIOR METAL-CERAMIC CROWN STEP NO :6 LINGUAL AXIAL REDUCTION
  57. 57. POSTERIOR METAL-CERAMIC CROWN STEP NO : 7 AXIAL FINISHING
  58. 58. POSTERIOR METAL-CERAMIC CROWN STEP NO :8 GINGIVAL BEVEL
  59. 59. POSTERIOR METAL-CERAMIC CROWN

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