The Influence of Newly Developed and Conventional Irrigants on the Accuracy of Three Electronic Apex Locators

Biomechanical preparation is one of the most important steps in root canal treatment (RCT) and should terminate at the apical constriction (minor foramina) (AC). For endodontic therapy, the ideal working length (WL) is the distance from a coronal reference point to the AC in the root canal system (RCS).

Three Electronic Apex Locators

Having the narrowest diameter of the RCS the AC, in which the least blood build up, constitutes a border between pulpal and periodontal tissues. For many years, the radiographic apex has been the accepted location for the WL to terminate. However, as the radiograph provides a 2-dimensional image of a 3 dimensional structure, and the foramen commonly does not coincide with the apex, it does not consistently reveal the end point of the RCS.  

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