Presentation on theme: "Working Length Determination"— Presentation transcript:
1Working Length Determination Presented by:Josef Ma. Karlos S. Bringas, D.M.D., D.D.S., M.S.Department of Endodontics
2Radiographic LengthThe length of the tooth as it appears on the radiograph.
3Estimated Working Length Radiographic length minus 1mm.
4Final Working Lengthis 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.
12Set #15 file to Estimated Length Insert the file into the canal to stopper length and take a radiograph at this time.
13Working 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.
14Working Length Radiograph File appears to end 1mm short of the apex.No need to adjust the final working length.
15Working Length Radiograph In this case, estimated working length is equal to the final working length.EWL = FWLRecord FWL
17Working 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.
23Working 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.