Journal of Operative Dentistry & Endodontics

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VOLUME 6 , ISSUE 2 ( July-December, 2021 ) > List of Articles


In Vitro Comparative Evaluation of the Accuracy of Three Electronic Apex Locators in Mandibular Molars Using Cone-beam Computed Tomography

Sunny Agarwal, Ramya Raghu, Ashish Shetty, PM Gautham, Subhashini Rajasekhara, Priyanka Yadav

Keywords : Cone-beam computed tomography, Electronic apex locator, Working length

Citation Information : Agarwal S, Raghu R, Shetty A, Gautham P, Rajasekhara S, Yadav P. In Vitro Comparative Evaluation of the Accuracy of Three Electronic Apex Locators in Mandibular Molars Using Cone-beam Computed Tomography. J Oper Dent Endod 2021; 6 (2):65-68.

DOI: 10.5005/jp-journals-10047-0116

License: CC BY-NC 4.0

Published Online: 24-05-2022

Copyright Statement:  Copyright © 2021; The Author(s).


Background: Accurate estimation of the working length (WL) from the coronal reference point to the minor diameter (apical constriction) is critical in endodontic therapy. Many electronic apex locators are available to precisely measure this apical limit. Aim: To assess the precision of three current electronic apex locators—Root ZX Mini, CanalPro, and Apex ID in the mesial canals of mandibular molars. Cone-beam computed tomography (CBCT) was employed to verify their accuracy. Materials and methods: Thirty mandibular first molars with curved mesial roots were selected. Cone-beam computed tomography (CBCT) was used to assess the length of the teeth. Samples were decoronated and mesiobuccal canal orifices were enlarged with Hyflex CM 25/08 and irrigated with 2 mL 3% sodium hypochlorite. Canals were prepared with size 10 K-file and the measurements were recorded with apex locators at marks “APEX 0/0” and “0.5 mark” as electronic tooth length and the electronic WL, respectively by visual means, and this was verified using CBCT. Statistical analysis was done using the repeated measures of ANOVA test. Results: CanalPro, Root ZX Mini, and CBCT values were very similar. Apex ID values were longer than CBCT values. Conclusion: CanalPro readings closely matched those of CBCT measurement followed by Root ZX mini. Apex ID showed longer readings.

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