shlinberg casts and die 87-9-5

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shlinberg casts and die 87-9-5

shlinberg casts and die 87-9-5

  1. 1. WORKING CAST  is the cast that is mounted on an articulator. To provide the most accurate articulation, it normally should represent the entire arch
  2. 2. REQUIREMENTS FOR GOODREQUIREMENTS FOR GOOD CASTSCASTS  1. bubble free1. bubble free  especially along the finish lines of theespecially along the finish lines of the prepared teeth.prepared teeth.  2. distortion free.2. distortion free.  3. trimmed3. trimmed  to insure access for carving wax patternto insure access for carving wax pattern margins.margins.
  3. 3. WORKING CAST WITH A SEPARATE DIE
  4. 4. WORKING CAST WITH A SEPARATE DIE  disadvantages  wax pattern must be transferred from one to the other  internal adaptation  obtained from  separate impressions  pouring an elastomeric full-arch impression twice  first cast is used for fabrication of the die
  5. 5. IMPRESSION POURING
  6. 6. DIE PREPARATION Stone is added Tray is tilted
  7. 7. DIE PREPARATION Stone is added to the impression The die is first trimmed on a model trimmer
  8. 8. DIE PREPARATION handle is slightly larger than preparation. Improperly trimmed die
  9. 9. DIE PREPARATION The handle should be 1 inch long The die is trimmed with an acrylic bur.
  10. 10. DIE PREPARATION Shaping near the finish line with a scalpel The die is with the discoid end of a Tanner carver
  11. 11. ERROR !!! This die is too short, and it does not allow adequate access for margin finishing.
  12. 12. DIE CONTOURS SHOULD BE SIMILAR TO THOSE OF A NATURAL TOOTH
  13. 13. DIE PREPARATION Axial contours of the wax pattern are influenced by die trimming. finish line on die outlined with a redred pencil.
  14. 14. DIE PREPARATION Die relief agent One-piece die
  15. 15. WORKING CAST WITH A REMOVABLE DIE
  16. 16. IF A REMOVABLE DIE SYSTEM IS USED, IT SHOULD SATISFY THESE REQUIREMENTS17  The dies must return to their exact original positions.  2. The dies must remain stable, even when inverted.  3. The cast containing the dies must be easy to mount on an articulator
  17. 17. WORKING CAST WITH A REMOVABLE DIE  Most of these devices can either be oriented in the impression before it is poured  attached to the underside of a cast that has already been poured prepour technique post-pour technique
  18. 18. WORKING CAST WITH A REMOVABLE DIE  1. Straight dowel pin  2. Curved dowel pin  3. Pindex system  4. Di-Lok tray  5. Accutrac
  19. 19. TYPESOFANTIROTATIONAL DEVICESUSEDFORREMOVABLE DIES A, flat-sided single dowel; B, single curved dowel; C, double straight dowels with a common head; D, two separate parallel dowels; E, keyed plastic outer tray
  20. 20. STRAIGHT DOWEL PIN Dowel pins positioned over the impression Paper clips are added to nonremovable parts
  21. 21. The stone around the dowel pins is lubricated paper towel used to fill in the open, center portion
  22. 22. Wax at the ends of the dowel pins is removed Dies are separated from the rest of the cast
  23. 23. the ends of the dowel pins are tapped to loosen Base of die is trimmed with an acrylic bur.
  24. 24. Dies are reseated into the cast wax is removed from the ends of the dowel pins.
  25. 25. PART 2
  26. 26. ANY QUESTION ?
  27. 27. CURVED DOWEL PIN
  28. 28. curved dowel (A), positioning bar (B), straight pins (C) first pour of die stone (D) to the impression Depressions are made about 2.0 mm deep on either side of the dowels in the two large segments of the cast that will carry the unprepared teeth CURVED DOWEL PIN
  29. 29. coat of petrolatum is applied to stone & dowels Boxing wax with the tips of the dowels sticking CURVED DOWEL PIN
  30. 30. CURVED DOWEL PIN The completed cast is sawed Segment is removed by pressing on the exposed tip
  31. 31. CEMENTED CURVED PIN
  32. 32. CEMENTED CURVED PIN The working cast is trimmed to receive cemented dowels Holes are drilled into the underside of the cast, under the indicated locations
  33. 33. CEMENTED CURVED PIN The cast is keyed with a large acrylic bur cyanoacrylate cement
  34. 34. CEMENTED CURVED PIN The head of a curved dowel is seated saw cuts after the base is poured
  35. 35. PINDEX SYSTEM
  36. 36. PARTS OF THE PINDEX MACHINE.
  37. 37. PINDEX SYSTEM sufficient stone to allow for trimming is added The bottom of the cast is trimmed
  38. 38. PINDEX SYSTEM The cast should be 15 mm thick The periphery of the cast is trimmed
  39. 39. PINDEX SYSTEM The palate/tongue area is trimmed Location of the pin holes is marked with a pencil
  40. 40. PINDEX SYSTEM Pencil marks are placed under illuminated dot The thumbs are used to stabilize the cast while lifting the handle bar with the fingers.
  41. 41. PINDEX SYSTEM  Debris is removedDebris is removed  pin holes refinedpin holes refined  Shorter pins 1stShorter pins 1st Cyanoacrylate cementCyanoacrylate cement
  42. 42. PINDEX SYSTEM  White sleeves > long pinsWhite sleeves > long pins  bottom of cast is lubricatedbottom of cast is lubricated  Utility wax > long pins.Utility wax > long pins. gray sleeves are blockedgray sleeves are blocked
  43. 43. PINDEX SYSTEM  A palatal/tongue fillerA palatal/tongue filler  The filler is placed on theThe filler is placed on the castcast  Boxing waxBoxing wax The filler is seated to theThe filler is seated to the castcast
  44. 44. PINDEX SYSTEM  Microstone is pouredMicrostone is poured  The base former filledThe base former filled  Model seated to base formerModel seated to base former Stone is vibrated on bottomStone is vibrated on bottom
  45. 45. PINDEX SYSTEM  Wax over the long pins isWax over the long pins is removed.removed.  The sawThe saw cuts are premarkedcuts are premarked  Dies are sectioned from theDies are sectioned from the undersideunderside  The cast is removed by tappingThe cast is removed by tapping the pinsthe pins
  46. 46. PINDEX SYSTEM Dies may also sectioned from the occlusal A large condenser also be used to loosen cast should be poured in a U shape, no stone in the center. The completed cast on the articulator
  47. 47. PINDEX SYSTEM The lingual side of the cast base is trimmed with an arbor band. Horizontal grooves are cut in the base to give it retention
  48. 48. DI-LOK TRAY
  49. 49. DI-LOK TRAY The cast is placed into stone in the tray Disassembly of the cast. A saw cut is made on each side of the prepared tooth The cast is loosed by tapping on the front of the base
  50. 50. DI-LOK TRAY The prepared tooth is broken free from the cast die is trimmed The cast and tray mounted on the articulator The cast and die(s) are reassembled in the tray
  51. 51. ‫دندان‬ ‫مارژین‬ ‫که‬‫ک‬‫ک‬ ‫کورتی‬‫ک‬‫ص‬ ‫در‬‫دندان‬ ‫مارژین‬ ‫که‬‫ک‬‫ک‬ ‫کورتی‬‫ک‬‫ص‬ ‫در‬ ‫مجاور‬ ‫دندان‬ ‫به‬ ‫خورده‬ ‫تراش‬‫مجاور‬ ‫دندان‬ ‫به‬ ‫خورده‬ ‫تراش‬ ‫دای‬ ‫تکنیک‬ ‫کدام‬ ‫کد‬‫ک‬‫باش‬ ‫کک‬‫ک‬‫نزدی‬‫دای‬ ‫تکنیک‬ ‫کدام‬ ‫کد‬‫ک‬‫باش‬ ‫کک‬‫ک‬‫نزدی‬ ‫؟‬ ‫دارد‬ ‫ترجیح‬‫؟‬ ‫دارد‬ ‫ترجیح‬

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