Ex vivo comparison of the accuracy of three apex locators in working length determination

This study aimed to compare the accuracy of working length measurement by different types of electronic devices (electronic apex locators) and compared with actual length of the root canal (the distance from a coronal reference point to an apical reference point 0.5 to 1.0 mm) short of the anatomical apical foramen. Thirty-four extracted sound, fully formed, single-rooted human teeth (Premolars), which were extracted for orthodontic purposes, were used in the current study. Within the limitations of the current study, it can be concluded that apex locators are valuable devices for the working length determination with accuracy up to 100%, and iPexII was the most accurate with the YC-RAF was the least accurate with statistically non significant difference.