Endo note 12 rotary technique


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Endo note 12 rotary technique

  1. 1. Non ISO File Technique8/24/2009 Endo12 1
  2. 2. Use stainless steel instruments - files files used manually files made by twisting wires of square, triangular or diamond cross section These have ISO taper8/24/2009 Endo12 2
  3. 3. ISO stands for International Standards Organization Taper is the amount by which the diameter of an instrument increases from tip to handle8/24/2009 Endo12 3
  4. 4. This is the taper set by the ISO It is set at 0.02 per mm This is commonly referred to as 02 taper8/24/2009 Endo12 4
  5. 5. 02 taper does not match the taper of root canals Root canals have tapers close to 04, 06 or even 088/24/2009 Endo12 5
  6. 6. By using a lot of instruments (files)in complex protocols e.g. Crown Down, Step Back Techniques8/24/2009 Endo12 6
  7. 7. A series of files used from coronal to apical sequentially with recapitulation8/24/2009 Endo12 7
  8. 8. S/S instruments have to be used in reciprocating action i.e. rotate clockwise, then anti-clockwise or in push - pull action If these are rotated continually in one direction, these fracture Not very flexible8/24/2009 Endo12 8
  9. 9. Push - pull action leads to ledge formation in root canals This action also pushes debris into the canal causing blockages8/24/2009 Endo12 9
  10. 10. By using these files manually in reciprocating action i.e. Balanced Force Technique But this is a very slow process8/24/2009 Endo12 10
  11. 11. By using Greater Taper GT files The Greater Tapers matchhRRoot Canal tapers tC needing fewer files By making them of Nickel Titanium instead of S / S so that these are flexible and can be rotated continually in one direction without risk of fracture Thus NiTi GT Rotary instruments were born8/24/2009 Endo12 11
  12. 12. Made of Nickel Titanium alloy NiTi wires cannot be twisted Therefore, made by machining - makes these files very expensive These have a Taper > ISO Taper Tapers of 04, 06, 08, 10 & even 12 These tapers are similar to taper of root canals8/24/2009 Endo12 12
  13. 13. 8/24/2009 Endo12 13
  14. 14. ISO Greater Taper 02 04 06 088/24/2009 Endo12 14
  15. 15. A ProFile Rotary File kit Note the large no. of files with different tapers and tip diameters8/24/2009 Endo12 15
  16. 16. A ProFile instrument Cross-section is similar to that of system GT with Triple U Endo12 shape8/24/2009 16
  17. 17. 06 taper 08 taper 10 taper8/24/2009 Endo12 17
  18. 18. Invented by Dr. Stephen Buchanan of USA in the 1980’s Has revolutionised Endodontic Practice Used in rotating action with special hand piece with a low speed, high torque motor Now several designs and brands available8/24/2009 Endo12 18
  19. 19. 8/24/2009 Endo12 19
  20. 20. NiTi exists in 2 forms with different properties Martensite Low temp form, low modulus, high strain Austenite High temp form, high modulus, low strain Shape memory NiTi exhibits super elasticity Under stress, martensite austenite8/24/2009 Endo12 20
  21. 21. Bends and returns to original shape Martensite Austenite Martensite Can negotiate curved root canals better8/24/2009 Endo12 21
  22. 22. A curved canal prepared with NiTi files8/24/2009 Endo12 22
  23. 23. System GT (Buchanan,Tulsa Dental) ProTaper (Dentsply) ProFile (Dentsply) RaCe (Schotlander) K3 (Sybron Kerr) Quantec FlexiMaster8/24/2009 Endo12 23
  24. 24. Note Triple Ucross-section ofthe rotary filecollect debrisFlat radial landskeep the filecentred on thenatural rootcanal whileenlarging it8/24/2009 Endo12 24
  25. 25. RaCe files have a triangular cross- section8/24/2009 Endo12 25
  26. 26. File tip is dome- shaped to prevent ledge formation & canallttransportation8/24/2009 Endo12 26
  27. 27. Progressively Tapered files Differing percentage of taper along the length of the file Makes the file even more flexible8/24/2009 Endo12 27
  28. 28. Note convex triangular cross- section8/24/2009 Endo12 28
  29. 29. Active cutting blades speed up cutting of root canal wall8/24/2009 Endo12 29
  30. 30. Blunt tip preventsledge formation &perforations8/24/2009 Endo12 30
  31. 31. Six files 3 Shapers SX S1 S2 3 Finishers F1 F2 F3 Finishing File F3 recognisable by Blue band on handle8/24/2009 Endo12 31
  32. 32. Same basic file shapes and tapers but designed to be used manually8/24/2009 Endo12 32
  33. 33. Unique handle allows ease of use8/24/2009 Endo12 33
  34. 34. Fewer files needed due to better taper Faster completion of canal preparation Flexible, enabling easy use in curved canals More predictable outcome8/24/2009 Endo12 34
  35. 35. Mandibular second molar with abrupt curvature of the distal canal. Note the apical control despite the conservative canal enlargement8/24/2009 Endo12 35
  36. 36. Before and after8/24/2009 Endo12 36
  37. 37. Before and after8/24/2009 Endo12 37