title: [Accuracy of three different electronic apex locators in determination of perforation with various conditions in vitro].
abstract: OBJECTIVE
  To evaluate accuracy of Propex, Raypex 5, Root ZX electronic apex locator in positions of the perforation with different irrigations in the root canal.
  
  
  METHODS
  Perforation lengths were measured with Propex, Raypex 5, Root ZX electronic apex locators in 19 extracted human teeth embedded in model after simulate perforation preparation by ultrasonic ET40 and compared with the actual canal length measurements taken before embedding the teeth in model. Measurements were taken with the different canal contents. RESULTS; Propex, Raypex 5, and Root ZX could locate the positions of the perforation with different irrigations in the root canal. The differences between actual root canal perforation length and measured root canal perforation length of same electronic apex locators in different irrigations were no statistically significant (P > 0.05). Meanwhile, the differences between actual root canal perforation length and measured root canal perforation length of three kinds of electronic apex locators in same irrigations were not statistically significant (P > 0.05).
  
  
  CONCLUSIONS
  Propex, Raypex 5, and Root ZX electronic apex locators can detect perforation accurately.
authors.affiliation: Dept. of Endodontics, College of Stomatology, Chongqing Medical University, Chongqing 400015, China.
authors.forename: Yue-Heng
authors.initials: YH
authors.lastname: Li
authors.forename: Zhi
authors.initials: Z
authors.lastname: Zhou
authors.forename: Yu-Qi
authors.initials: YQ
authors.lastname: Zheng
authors.forename: Ning
authors.initials: N
authors.lastname: Gan
authors.forename: Yu-Ying
authors.initials: YY
authors.lastname: Tang
authors.forename: Rui
authors.initials: R
authors.lastname: Li
authors.forename: Jiao
authors.initials: J
authors.lastname: Chen
mesh_terms: D003786:Dental Pulp Cavity; D006801:Humans; D066298:In Vitro Techniques; D008963:Molar; D009811:Odontometry; D012390:Root Canal Therapy; D019227:Tooth Apex; D014092:Tooth Root