title: Evaluation of the multifrequency electronic apex locator Joypex 5 in primary teeth.
abstract: OBJECTIVE
  To evaluate ex vivo the accuracy of the multifrequency electronic apex locator (EAL) Joypex 5 in primary molars.
  
  
  METHODS
  Fourteen primary molars were selected for a total of 25 root canals. Working length measurements were performed by direct observation (DO), using a 15 K-file into the root canal until its tip was visible at the apical foramen and electronically using the EALs Joypex 5. Data were analysed statistically using the intraclass correlation coefficient (ICC). To assess whether a significant difference in accuracy of the electronic apex locator existed, the Student's t test was performed at 5% significance.
  
  
  RESULTS
  No statistical difference was observed between the direct observation and the EAL measurement (p < 0.05). The ICC confirmed the agreement of different methods to measure canal length. The R(2) coefficient was close to 1, denoting a strong agreement between measures obtained with Joypex 5 and DO.
  
  
  CONCLUSIONS
  The multifrequency EALs Joypex 5 showed adequate accuracy in the root length determination of primary teeth.
authors.affiliation: Endodontics Department, Grande Rio University-UNIGRANRIO, Rio de Janeiro, Brazil, nogueiraemmanuel@hotmail.com.
authors.forename: E J N L
authors.initials: EJ
authors.lastname: Silva
authors.forename: D R
authors.initials: DR
authors.lastname: Herrera
authors.forename: E J
authors.initials: EJ
authors.lastname: Souza-Júnior
authors.forename: T P
authors.initials: TP
authors.lastname: Rosa
mesh_terms: D002138:Calibration; D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D055615:Electrical Equipment and Supplies / Q000592:standards* / Q000706:statistics & numerical data; D006801:Humans; D008422:Materials Testing; D008963:Molar / Q000033:anatomy & histology; D009811:Odontometry / Q000295:instrumentation*; D018915:Root Canal Preparation / Q000295:instrumentation*; D019227:Tooth Apex / Q000033:anatomy & histology*; D014094:Tooth, Deciduous / Q000033:anatomy & histology*