Comparison of The Accuracy in Working Length of Electronic Foraminal Locators After Cervical Preflaring: An in Vitro Study

Abstract To evaluate the influence of cervical preflaring on the accuracy of working length determination using electronic foraminal locators. Forty single-rooted premolars classified as Vertucci type I were used to analyze the accuracy of three electronic foraminal locators (Root ZX Mini, Raypex 6, and Minipex). The actual working length was determined visually under a microscope, and the electronic measurements were performed in alginate. These measurements were recorded both before and after cervical preflaring. The preflaring was performed using an ORIFICE SHAPER (ONE FLARE) at 400 RPM and 3 N, with irrigation using 5.25% sodium hypochlorite. The purpose was to evaluate the effect of preflaring on the accuracy of electronic foraminal locators. The results showed significant differences in working length measurements before and after cervical preflaring. The accuracy of Raypex 6 and Minipex was affected, but not that of the Root ZX mini. Raypex 6 and Minipex improved their precision after cervical preflaring. Root ZX mini was more accurate before preflaring, although Raypex 6 surpassed it afterward. The accuracy of electronic foraminal locators varies depending on the method used. This research concludes that cervical preflaring affects the accuracy of the studied foraminal locators differently. Raypex 6 and Minipex improved their accuracy with cervical preflaring, while Root ZX mini consistently maintained its precision. These results suggest that the advantage of cervical preflaring depends on the locator used and is more beneficial for devices whose accuracy improves after its application.