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J Indian Soc Pedod Prev Dent. 2019 Apr-Jun;37(2):157-161. doi: 10.4103/1319-2442.261334.

Comparing the accuracy of cone-beam computed tomography and electronic apex locator for root canal length determination in primary teeth.

Author information

Department of Pedodontics and Preventive Dentistry, D Y Patil Deemed to be University School of Dentistry, Navi Mumbai, Maharashtra, India.



The aims of this study were to assess the accuracy of electronic apex locator (CanalPro™) and cone-beam computed tomography (CBCT) in determination of working length in primary teeth compared to direct visual length.

Subjects and Methods:

Ninety-nine primary teeth (207 root canals) were subjected to CBCT scan for assessment of working length. All root canals were then measured using CanalPro™ Apex Locator. Actual length of root canal was measured using direct visual method which was kept as control.

Statistical Analysis Used:

One-way ANOVA and Tukey's honestly significant difference tests were performed using the Statistical Packages for the Social Sciences (SPSS) version 16.


Overall estimated mean values obtained using three methods show that CBCT method was more accurate than the apex locator in determining the working length in primary teeth. However, these values were statistically insignificant.


CanalPro™ Apex Locator can be used in primary teeth to accurately determine the working length. Nevertheless, a preexisting CBCT can always be used for determination of the working length in the primary teeth.


Cone-beam computed tomography; electronic apex locator; primary teeth; working length

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