1 / 81

Cleaning and Shaping of the Root Canal System. Part II

Cleaning and Shaping of the Root Canal System. Part II. Edit by Hou Tiezhou 02988088507. Root Canal Instrumentation. Estimate working length Verify canal patency Estimate canal size Establish actual working length. Root Canal Instrumentation. Crown down preparation Coronal third

Mercy
Download Presentation

Cleaning and Shaping of the Root Canal System. Part II

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Cleaning and Shaping of the Root Canal System. Part II Edit by Hou Tiezhou 02988088507

  2. Root Canal Instrumentation • Estimate working length • Verify canal patency • Estimate canal size • Establish actual working length

  3. Root Canal Instrumentation Crown down preparation • Coronal third • Middle third • Apical third

  4. Armamentarium

  5. Armamentarium

  6. Armamentarium Stainless steel size 10 K-files • Used to explore canal patency • Filing or quarter turn pull motion • Do not rotate through 360 degrees

  7. Armamentarium Stainless steel size 15 and 20 K files • Used to establish actual working length

  8. Armamentarium

  9. Armamentarium Profile orifice shapers • Used to prepare the coronal one third of the root canal

  10. Profile Orifice Shapers

  11. Armamentarium Profile 0.06 taper rotary files • Used to prepare the middle third

  12. Armamentarium

  13. Armamentarium Profile 0.04 taper hand NiTi files • Used to prepare the apical third of the root canal

  14. Armamentarium

  15. Estimated Working Length Estimated working length is the distance from the reference point to the radiographic apex, as measured on a parallel preoperative radiograph

  16. Estimated working length • Take a pre-operative parallel radiograph • Clinically, use a XCP film holder

  17. Estimated working length • Length from incisal edge to radiographic apex • Only an estimate because of radiograph distortion

  18. Estimate canal size • Radiographic appearance • Crown/root morphology • Standardized sizes (See table in manual)

  19. Estimate canal size

  20. Explore Canal Patency • Ensure that canal can be negotiated to radiographic apex • Select #10 K file • Precurve file if necessary

  21. Explore Canal Patency

  22. Explore Canal Patency

  23. Establish Actual Working length Instrumentation should terminate at: • The apical constriction • 1 mm short of radiographic apex • Actual WL = Estimated WL – 1 mm

  24. Establish actual working length WL can be established using: • Radiographs • Apex locator

  25. Establish Actual Working Length

  26. Establish Actual Working Length

  27. Establish Actual Working Length

  28. Establish Actual Working Length

  29. Crown Down Preparation

  30. Crown Down Preparation

  31. Crown-down preparation Plastic incisor with transparent root

  32. Crown-down preparation • Place SS K file into canal until the tip is just visible at the apex

  33. Actual Working Length • Remove file from canal • Subtract 1 mm • This is the actual working length • In this case the WL is 20 mm

  34. Actual Working Length

  35. Preparation of Coronal Third

  36. Preparation of Coronal Third • The coronal third measurement is WL minus 8 mm, that is 12 mm • Profile OS do not have rubber stops – however the cutting flutes measure 10 mm • The goal is to work the largest OS to 12 mm

  37. Preparation of coronal third

  38. Preparation of coronal third

  39. Preparation of the coronal third • Rotate OS at 300 rpm Note: Orifice shaper should be rotating at 300 rpm before it is placed in the canal • Advance the OS in 1 mm increments • When resistance is encountered retract OS while still rotating • Never force any instrument apically

  40. Preparation of coronal third Blue (#60) OS extends to approx. 9 mm

  41. Preparation of coronal third Irrigation! Irrigation! Irrigation!

  42. Preparation of coronal third

  43. Preparation of coronal third Gold (#50) OS reaches 12 mm

  44. Preparation of coronal third • Progress from larger to smaller orifice shaper • Each smaller OS will extend further into canal • Repeat the sequence until the largest OS extends to 12 mm

  45. Preparation of coronal third Blue (#60) OS extend to WL – 8 mm = 12 mm

  46. Preparation of Middle Third Profile 0.06 taper series 29 rotary files

  47. Preparation of Middle Third • Profile 0.06 taper series 29 rotary files • The middle third measurement is WL minus 4 mm, that is 16 mm • The aim is to work the brown (#7) file to 16 mm

  48. Preparation of Middle Third • Proceed from larger to smaller file • Each smaller file will extend further into the canal • Repeat the sequence until the largest file extends to 16 mm

  49. Preparation of middle third

  50. Preparation of middle third

More Related