Comparative study of three electronic apex locators in determining working length

V08N02 | 2018 | Original Article | Pages 42 to 46

Michele Bolan, Fernanda Lebarbenchon Moura Costa, Jéssica Copetti Barasuol, Gabriela Santos Felippe, Mara Cristina Santos Felippe, Wilson Tadeu Felippe

Endodontics, Root canal preparation, Tooth apex,

Introduction: Tooth length measure is important to endodontic treatment success. Objective: This in vitro study was conducted to compare the ability of three electronic devices when measuring foramen and apical contrition. Methods: One hundred human single-rooted teeth were used to have direct measurement (tooth length) performed by inserting the file into the root canal until its tip was visualized in the apical foramen. Measurement by apex locators (Neosono Ultima EZ, Foramatron IV e Tri Auto ZX) was performed twice to establish measurement of the apical foramen and constriction. Results were considered acceptable when coinciding with direct measurements, or different from ± 0.5 mm. One-way ANOVA, Tukey-Kramer and Student t-tests were performed. Results: Tri Auto ZX was more accurate in locating the foramen (86.3%) and apical constriction (84.2%). There was no difference between Tri Auto ZX and Foramatron IV when locating the constriction (p = 0.19). As far as the apical foramen measurement, Tri Auto ZX and Neosono Ultima EZ were similar in precision (p = 0.13). Conclusions: Tri Auto ZX was more accurate in locating the apical foramen than Foramatron IV and was also more effective in measuring a point close to and below the foramen when compared to Neosono Ultima EZ.

Bolan M, Costa FLM, Barasuol JC, Felippe GS, Felippe MCS, Felippe WT. Comparative study of three electronic apex locators in the determination of working length. Dental Press Endod. 2018 May-Aug;8(2):42-6. DOI: