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Differences of EWL from AWL were calculated. Furthermore, the percentage of acceptable measurements (tolerance limit of ± 0.5 and ± 1 mm) was calculated for each apex locator. One-way ANOVA test with post hoc paired t-test and Chi-square test was used to analyze the data (P 0.05). Conclusion The present study revealed that no statistically significant differences were observed between the two apex locators after Ca(OH)2 paste removal with different irrigants. Copyright © 2020 Dental Research Journal.Background Since secondary caries is