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Year : 2016  |  Volume : 28  |  Issue : 1  |  Page : 18-22

A comparative clinical study on the correlation of working length determined using three different electronic apex locators with radiographic working length: An in vivo study

1 Department of Conservative Dentistry, Sri Sankara Dental College, Varkala, Thiruvananthapuram, Kerala, India
2 Department of Restorative Dental Science, College of Dentistry, King Khalid University, Abha, Saudi Arabia

Correspondence Address:
Devi S Lekshmy
Department of Conservative Dentistry and Endodontics, Sri Sankara Dental College, Varkala, Thiruvananthapuram, Kerala
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0970-7212.184325

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Aim: This in vivo study was done to correlate the values of three different electronic apex locators: Root ZX, iPex, and Apex ID, with the radiographic working length (WL). Materials and Methods: Nineteen maxillary incisors with completely formed root apices indicated for endodontic treatment were chosen. After access preparation, coronal flaring and pulp extirpation, electronic measurement of WL was done with a No: 15 K file using the three devices on each tooth. A WL radiograph was then taken with the file placed within the canal and the length determined by following Ingle's method. The data were then analyzed using the correlation coefficient and Z-test. Results: Root ZX showed the maximum correlation (r = 0.9881) with radiographic WL followed by Apex ID (R = 0.9731) and iPex (R = 0.9508). Root ZX had a statistically significant higher correlation with radiographic WL in comparison with iPex (P < 0.05). Conclusion: Maximum correlation of readings with the radiographic length was shown by Root ZX followed by Apex ID and then by iPex.

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