Zahid Iqbal, Madiha Zaighum.
Comparision of Digital Radiographic Method in Determination of Working Length in Vivo to the Actual Working Length ex Vivo after Extraction.
Isra Med J Nov ;9(2):71-4.

OBJECTIVE: To compare the accuracy of digital radiography method for root canal working length determination compared with actual root canal length in patients presenting at Isra University Hospital Hyderabad. STUDY DESIGN: A Cross sectional comparative study th PLACE AND DURATION: At Operative Department/College of Dentistry Isra University, Hyderabad. Study duration was from 13 th August 2012 to 13 August 2013. METHODOLOGY: A total fifty patients of either gender who were advised extractions of teeth for orthodontics or any other reasons were selected. The access opening was performed, after which a stainless steel wire was inserted in the canal. The Digora system and aid of a device were used and all digital radiographs were taken by the paralleling technique. The radiographic images were sent and saved in a computer and working length was calibrated according to the Bregman's formula. The included teeth were extracted. The root canal endodontic file was inserted into the root canal and visibility of tip of the file was checked at the apical foramen and actual working length was determined. RESULTS: Among total of fifty patients, the mean difference between the calibrated working length and actual length was measured for each tooth. The mean difference was .030 mm with the standard deviation of ±1.29524. There was an insignificant difference between the two groups (p=.871) with the confidence level of 95%. CONCLUSION: There is an insignificant difference between digital radiographic working length by Bregman's method and actual working length of root canal of teeth.

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