The influence of heat treatment of nickel-titanium (NiTi) instruments on the accuracy of electronic apex locators (EALs) integrated with endodontic motors has been the subject of several studies. Gavini et al. (2022)conducted a study to evaluate the influence of different heat treatments of NiTi instruments and the diameter of the apical preparation on the accuracy of an EAL used during root canal preparation. The study found that the heat treatment and the diameter of the apical preparation did not influence the accuracy of working length determination by an EAL integrated with the endodontic motor (Gavini et al., 2022).

Heo et al. (2022) investigated the accuracy of two electronic apex locators (DentaPort and Bingo) using heat-treated NiTi files. The study compared the true root canal length determined using K files with the electronically measured length using two different NiTi files (ProGlider and HyFlex EDM Glide Path File) and two electronic apex locators. The results showed that there was no significant difference between the measurements with different NiTi files or electronic apex locators, and all differences between the true root canal length and electronically measured length were within ±0.5 mm (Heo et al., 2022).

Similarly, Sadeghi & Abolghasemi (2010) evaluated the accuracy of the Raypex5 electronic apex locator using stainless-steel hand K-files versus nickel-titanium rotary Mtwo files. The study aimed to assess the accuracy of the apex locator when different types of files were used interchangeably. The results showed that there was no significant difference in accuracy between the two types of files (Sadeghi & Abolghasemi, 2010).

Overall, the available literature suggests that the heat treatment of NiTi instruments does not significantly affect the accuracy of electronic apex locators in determining the working length during root canal preparation. The accuracy of electronic apex locators is not adversely affected by the presence of irrigation solutions used during root canal therapy (Al-Hadlaq, 2011). These findings provide reassurance to clinicians regarding the accuracy and reliability of electronic apex locators integrated with endodontic motors in determining the working length during root canal treatment.