Abstract
Objectives: To determine the accuracy of each apex locator individually with the reference / actual working length and compare the above recorded electronic canal length measurements with subsequent radiovisiograph. Study design: Twenty single-rooted human teeth were used, sectioning the crown to gain access to the root canal. The reference/actual working length was determined under 4x and 10x magnification and the electronic working length was determined using Root ZX and Propex II apex locators in an electronic set up. The recorded electronic canal length measurements were compared with subsequent radiovisiograph. Wilcoxson Signed rank test and fishers exact test were performed to statistically analyse the results. Results: Both the Electronic Apex locator's corresponded well with the reference/actual working length with no statistical difference between their readings. Conclusion: Both Root ZX and Propex II can be used for accurate working length determination in conjuction with radiographs
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