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Introduction: Determination of the root canal length accurately has been a challenge in endodontics. The accuracy of the electronic apex locators may vary in different clinical conditions. Hence, their accuracy in these conditions need to be evaluated for better clinical outcome.

Objective: This in vitro study had attempted to determine the accuracy of electronic apex locator (Propex Pixi) in different simulated clinical conditions of irrigant within the canal, open apex, bleeding within the canal and horizontal root fracture.

Material and Method: One hundred forty extracted, single rooted and single canal human teeth were used in four different simulated clinical conditions with thirty-five specimen in each group. Actual length was confirmed by the file tip viewing at the level of the apical foramen under magnifying lens at 10X magnification. The teeth were mounted into the alginate mould to simulate the periodontium. The measurements were obtained by Propex Pixi apex locator and the actual working length was considered 0.5 mm less than the actual length. Data were then processed and analyzed using R statistical software, (R version 4.0.2) and were compared with the actual length at the 5% significance level.

Result: No significant statistical difference was found between the working length and the electronic working length in either of the different simulated clinical conditions.

Conclusion: The result of this study indicates that Propex Pixi can accurately determine the root canal working length in different clinical conditions.

Apex locator; apical Foramen; open apex; propex pixi; working length.