title: Influence of apical periodontitis on the accuracy of 3 electronic root canal length measurement devices: an in vivo study.
abstract: BACKGROUND
  The aim of this in vivo study was to evaluate the influence of apical periodontitis (AP) on the accuracy of Dentaport ZX (J Morita, Kyoto, Japan), Raypex 5 (VDW, Munich, Germany), and i-Root (S-Denti, Seoul, Korea) electronic root canal length measurement devices (ERCLMDs).
  
  
  METHODS
  Thirty-two single-rooted teeth scheduled for extraction, consisting of 16 teeth with AP and 16 teeth with normal periapex (NP), were selected. The access cavity was prepared, and the coronal portion of the canal was flared. The electronic working length (EWL) was determined by each ERCLMD according to each manufacturer's instructions. Each tooth was extracted, and the actual working length (AWL) was determined by inserting a size 15 K-file until the tip could be seen at a position tangential to the major foramen and then 0.5 mm was subtracted from the measurement. The distance from the file tip (EWL) to the point 0.5 mm coronal to the major foramen (AWL) was calculated. Data were analyzed using the nonparametric Fisher exact test and the chi-square test. Statistical significance was set at P < .05.
  
  
  RESULTS
  The accuracies of Dentaport ZX, Raypex 5, and i-Root within ± 0.5 mm in the AP group were 93.8%, 81.3%, and 75.0%; they were 93.3%, 86.7%, and 73.3% in the NP group, respectively. There were no significant differences between the accuracy of each device in the 2 groups (P > .05). Considering the 2 groups of AP and NP, there were no statistically significant differences in the accuracy of the ERCLMDs (P > .05).
  
  
  CONCLUSIONS
  The presence of AP did not influence the accuracy of ERCLMDs.
authors.affiliation: Torabinejad Dental Research Center, Department of Endodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Masoud
authors.initials: M
authors.lastname: Saatchi
authors.affiliation: Torabinejad Dental Research Center, Department of Endodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. Electronic address: aminozarbian@dnt.mui.ac.ir.
authors.forename: Mohammad Ghasem
authors.initials: MG
authors.lastname: Aminozarbian
authors.affiliation: Torabinejad Dental Research Center, Department of Endodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Seyed Mohsen
authors.initials: SM
authors.lastname: Hasheminia
authors.affiliation: Dental Research Center, Department of Endodontics, Faculty of Dentistry, Birjand University of Medical Sciences, Birjand, Iran.
authors.forename: Amin
authors.initials: A
authors.lastname: Mortaheb
mesh_terms: D000328:Adult; D001641:Bicuspid / Q000473:pathology; D003786:Dental Pulp Cavity / Q000473:pathology*; D003790:Dental Pulp Necrosis / Q000473:pathology; D055615:Electrical Equipment and Supplies / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D007180:Incisor / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009811:Odontometry / Q000295:instrumentation* / Q000706:statistics & numerical data; D010485:Periapical Periodontitis / Q000473:pathology*; D010486:Periapical Tissue / Q000033:anatomy & histology; D016300:Radiography, Bitewing; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000706:statistics & numerical data; D019227:Tooth Apex / Q000473:pathology*
keywords: Apical periodontitis; Dentaport ZX; Raypex 5; electronic apex locators; i-Root; working length