Accuracy of Working Length Determination using NovApex and Root-ZX Apex Locators: An in vitro Study
Vahid Zand, Saeed Rahimi, Paria Davoudi, Abubakr Afshang
Citation Information :
Zand V, Rahimi S, Davoudi P, Afshang A. Accuracy of Working Length Determination using NovApex and Root-ZX Apex Locators: An in vitro Study. J Contemp Dent Pract 2017; 18 (5):383-385.
This ex vivo study evaluated the accuracy of the Root-ZX electronic apex locator (EAL) (J. Morita, Tokyo, Japan) and the NovApex (Forum Technologies, Rishon Lezion, Israel) in determining the working length (WL) during endodontic treatment.
Materials and methods
Forty extracted single-rooted human teeth were selected for this study. The actual WL was measured with visual technique by a size #15 k-file under magnification. Then, the canal lengths were measured electronically with both Root-ZX and NovApex apex locators within ±0.5 and ±1 mm. Mean percentage of data was analyzed between groups using paired t-test, with a statistically significant level of p < 0.05.
Results
The accuracy of NovApex apex locator was 85% within ±0.5 mm and 92.5% within ±1 mm. The accuracy of Root-ZX apex locator was 70% within ±0.5 mm and 97.5% within ±1 mm. There was no significant difference between the accuracy of the two EALs.
Conclusion
Both the NovApex and Root-ZX EALs are useful for measuring the WL with high accuracy.
Clinical significance
Given the importance of accurate WL determination in the success of endodontic treatments, the accuracy of different apex locators should be evaluated.
How to cite this article
Zand V, Rahimi S, Davoudi P, Afshang A. Accuracy of Working Length Determination using NovApex and Root-ZX Apex Locators: An in vitro Study. J Contemp Dent Pract 2017;18(5):383-385.
Outcome of primary root canal treatment: systematic review of the literature – part 2. Influence of clinical factors. Int Endod J 2008 Jan;41(1):6-31.
Glossary of endodontic terms. 9th ed. Chicago: American Association of Endodontists; 2015.
Apical limit of root canal instrumentation and obturation, part 1. Literature review. Int Endod J 1998 Nov;31(6):384-393.
The ability of root ZX apex locator to reduce the frequency of overestimated radiographic working length. J Endod 2002 Feb;28(2):116-119.
Effect of working length measurement by electronic apex locator or radiography on the adequacy of final working length: a randomized clinical trial. J Endod 2010 Nov;36(11):1753-1756.
New electronic canal measuring device based on the ratio method. J Endod 1994 Mar;20(3):111-114.
The ability of two apex locators to locate the apical foramen: an in vitro study. J Endod 2006 Jun;32(6):560-562.
The position and topography of the apical canal constriction and apical foramen. Int Endod J 1984 Oct;17(4):192-198.
Apical terminus location of root canal treatment procedures. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2000 Jan;89(1):99-103.
An in vivo evaluation of Root ZX electronic apex locator. J Endod 1996 Nov;22(11):616-618.
A SEM study of in vivo accuracy of the Root ZX electronic apex locator. J Endod 1998 Jun;24(6):438-441.
Ex vivo evaluation of the accuracy and coefficient of repeatability of three electronic apex locators using a simple mounting model: a preliminary report. Int Endod J 2010 Apr;43(4):269-274.
In vitro evaluation of the ability of three apex locators to determine the working length during retreatment. J Endod 2005 Sep;31(9):676-678.
Comparison between the accuracy of novapex apex locator and radiographs in determining radiographic apex. Iran Endod J 2011 Spring;6(2):65-68.
The evaluation of four electronic apex locators in teeth with simulated horizontal oblique root fractures. J Endod 2008 Dec;34(12):1497-1499.
