Naman Keshwani, Anu Narang, Santosh Kumar Singh, Shivani Rawat, Gayatri H. Giramkar, Sadhvi Pateriya

ABSTRACT

Introduction: Accurate working length determination is fundamental to endodontic success. While electronic apex locators (EALs) are reliable during primary root canal treatment, their accuracy during retreatment in the presence of different solvents is uncertain. Aim: This study aimed to evaluate the difference in working length measurements obtained using an apex locator during primary treatment and retreatment, and to compare its efficiency in the presence of different solvents. Materials and Methods: Working length was determined using an electronic apex locator in extracted permanent central incisors teeth during primary root canal treatment. After obturation, retreatment was simulated using different solvents, and working length was re-evaluated with the same apex locator. Differences between the two measurements were compared and the efficiency of the apex locator in the presence of various solvents was analysed. Result: There was no statistically significant difference in working length measurements either within or between groups. All three solvents demonstrated comparable performance, with minimal mean differences and negligible effect sizes, suggesting that the type of solvent does not affect the accuracy of the electronic apex locator during retreatment procedures. Conclusion: The type of solvent used during retreatment did not significantly influence the accuracy of electronic apex locator measurements. All three solvents showed comparable working length determination with negligible differences between groups.