Overall, the Root ZX was 82.3% accurate to within 0.5 mm of the apical constriction. In addition, this could also explain why this device was not adversely affected by the presence of sodium hypochlorite in the root canal system (Kobayashi 1995, Meares & Steiman 2002). Ounsi & Naaman
(1999) in an ex vivo study reported that the Root ZX was not capable of detecting the apical constriction and should only be used to detect the major foramen.