ABSTRACT Aim: This study compared the accuracy of the Root ZX Mini (electronic apex locator 1 EAL1) and the Meta Biomed Rootor (EAL2) when using 0.9% normal saline, 2% chlorhexidine (CHX), 1% sodium hypochlorite (NaOCl), and 2.5% NaOCl as irrigants. Methods: Seventy single-canal mandibular premolars were selected for the study. First, the “actual working length” (AWL) for each sample was measured. This step is done by observing the tip of the K-file at the level of the apical constriction under a stereomicroscope at × 30 magnification. Measurements were then taken for each tooth with EAL1 and EAL2 in the presence of the irrigants, with teeth mounted in alginate. Finally, the AWLs were statistically compared with the lengths obtained by the EALs. Data analysis was conducted using SPSS version 27, with a significance level of P ≤ 0.05. Results: The two EAL1 groups (0.9% normal saline and 1% NaOCl) were less accurate than the other groups ( P = 0.0196). EAL2 was significantly more precise than EAL1 ( P = 0.001) with a tendency to overestimate. Conclusion: In in vitro conditions, the highest degree of accuracy for EAL2 is achieved in the context of 0.9% normal saline, 2% CHX, and 1% NaOCl, while for EAL1, it is achieved by using 2.5% NaOCl. Consequently, it was determined that the utilization of an appropriate irrigant can enhance the accuracy of working length determination. In addition, the reports of EAL2 predominantly exceed the apex, while those of EAL1 demonstrate an underestimate.
Ghasemi et al. (Fri,) studied this question.