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Clinical Evaluation of the Accuracy of an Electronic Tooth Apex Locator

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Author(s): C. Stavrianos | L. Vasiliadis | I. Stavrianou | P. Kafas

Journal: Journal of Medical Sciences
ISSN 1682-4474

Volume: 7;
Issue: 8;
Start page: 1369;
Date: 2007;
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Keywords: Root canal length | electronic apex locator | accuracy | Ray-Pex 5

ABSTRACT
Clinical evaluation of the accuracy of an electronic apex locator, Ray-Pex 5, was carried out in 85 single-rooted teeth with vital pulp tissue. The normal procedure was followed, which included a standard endodontic access opening, pulp removal and irrigation of the root canal with 5.25% NaOCl. The working length of the selected teeth was estimated with Ray-Pex 5, using a size 15 K-file. The files were cemented at the measured working length and the teeth were extracted. It is thought that absolute comparisons could be made only with the actual working length directly measured after extraction of the teeth. For the teeth where the tip of the file was not visible at the apical foramen, the Berman-Fleischman technique was used. In locating the apical foramen Ray Pex 5 was 95% accurate, with clinically acceptable estimation within"0.5 mm. Ray Pex 5 was accurate 97.5% of the time to"1 mm. The significance of the difference between the electronically and microscopically assessed sample was found at the level of p< 0.01 when paired t-test performed (95% CI for the difference -0.496, -0.204). The electronic device used for this study was found reliable in estimating the real length of the tooth root minimizing the need for multiple periapical x-rays during endodontic treatment.
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