Introduction

Radiology is an essential part of endodontics to ensure successful root canal therapy.   It is helpful in estimating and confirming the lengths of root canals and to verify the apical extension of an endodontic file prior to and during instrumentation.   Traditionally, the root length is determined initially by measurement of periapical radiographs.^{1, 2, 3}   However, measurement of roots that are excessively curved is difficult when using this method.   With direct digital radiography, segmental measurements may be combined to give the overall working length of a curved root.   The accuracy of this segmental measurement tool compared to conventional film measurement techniques has not been tested.   Therefore, the aim of this study is to compare the segmental measurement tool from the Shick Technologies CDR digital system with the conventional film radiography measurement technique to determine preoperative working length.   (Figure 1)

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