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Accuracy of the Justy II Apex locator in determining working length in simulated horizontal and vertical fractures
Author(s) -
Azabal M.,
GarciaOtero D.,
De La Macorra J. C.
Publication year - 2004
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/j.0143-2885.2004.00776.x
Subject(s) - apex (geometry) , horizontal and vertical , geodesy , orthodontics , geology , medicine , anatomy
Abstract Aim To study the effectiveness of an electronic apex locator (EAL; Justy II; Yoshida Dentcraft, Tokyo, Japan) in locating simulated horizontal and vertical fractures in single roots. Methodology An EAL was used to measure the distance within the canal of horizontal ( n = 31) and vertical ( n = 31) fractures, created with a disk in single‐rooted teeth. Accuracy of the EAL was evaluated by comparing the measurements with those made using a size 10 file. Data were analysed with the non‐parametric Passing and Bablok method. Results For simulated horizontal fractures, the EAL measured exactly the same length as a size 10 file, without constant or proportional errors. In vertical simulated fractures, the EAL measured (on average) with a constant error of 7.5 mm shorter than the size 10 file; the difference had a wide confidence interval (−72.3 to 2.6 mm). Conclusions In this laboratory study, the Justy II EAL was able to determine accurately the position of simulated horizontal fractures, but was unreliable when measuring simulated vertical fractures.