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Working Length Determination

Working Length Determination. Presented by: Josef Ma. Karlos S. Bringas, D.M.D., D.D.S., M.S. Department of Endodontics. Radiographic Length. The length of the tooth as it appears on the radiograph. Estimated Working Length. Radiographic length minus 1mm. Final Working Length.

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Working Length Determination

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  1. Working Length Determination Presented by: Josef Ma. Karlos S. Bringas, D.M.D., D.D.S., M.S. Department of Endodontics

  2. Radiographic Length • The length of the tooth as it appears on the radiograph.

  3. Estimated Working Length • Radiographic length minus 1mm.

  4. Final Working Length • is determined to be -1 mm from the anatomical apex as measured from the working length (WL) radiograph. • THIS IS THE LENGTH TO WHICH THE CANAL WILL BE CLEANED & SHAPED AND OBTURATED.

  5. Select a Reference Point

  6. Take a Preoperative Radiograph

  7. Preoperative Radiograph • Measure the radiographic length. Apex Reference pt.

  8. Measure the radiographic length Ex. 22mm

  9. Compute for Estimated Length • Estimated Length is radiographic length minus 1mm. Ex. 22mm - 1mm = 21mm

  10. Treatment Record

  11. Treatment Record Incisal edge 21 mm

  12. Set #15 file to Estimated Length Insert the file into the canal to stopper length and take a radiograph at this time.

  13. Working Length Radiograph • The best case scenario is that there is no radiographic distortion with the preoperative radiograph. • The working length radiograph should show that the file ends 1mm short of the apex.

  14. Working Length Radiograph • File appears to end 1mm short of the apex. • No need to adjust the final working length.

  15. Working Length Radiograph • In this case, estimated working length is equalto the final working length. • EWL = FWL • Record FWL

  16. Treatment Record Incisal edge 21 mm 21 mm

  17. Working Length Radiograph • Sometimes, the radiograph shows that the file extends more apical than the ideal. • This means that the EWL is long. • Deduct this discrepancy from your EWL to arrive at the Final Working Length.

  18. Working Length Radiograph

  19. Working Length Radiograph • Example: EWL=21mm • Since radiograph shows that file is 1mm long then… 1mm

  20. Working Length Radiograph • Example: • EWL – 1mm = FWL • 21mm – 1mm = 20mm 1mm

  21. Working Length Radiograph • Example: • EWL – 1mm = FWL • 21mm – 1mm = 20mm 1mm

  22. Treatment Record Incisal edge 21 mm 20 mm

  23. Working Length Radiograph • Sometimes, the radiograph shows that the file does not reach the ideal length. • This means that the EWL is short. • Add this discrepancy to your EWL to arrive at the Final Working Length.

  24. Working Length Radiograph

  25. Working Length Radiograph • Example: • EWL=21mm • Since radiograph shows that file is 0.5mm short then… 0.5mm

  26. Working Length Radiograph • Example: • EWL+0.5 mm=FWL • 21mm+0.5mm=21.5mm 0.5mm

  27. Treatment Record Incisal edge 21 mm 21.5 mm

  28. Working Length Radiograph • If the radiograph shows that the discrepancy is more than 2mm, then a new radiograph should be taken after computing for the working length.

  29. Unacceptable discrepancy

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