title: In vivo accuracy of conventional and digital radiographic methods in confirming root canal working length determination by Root ZX.
abstract: OBJECTIVE
  To compare, in vivo, the accuracy of conventional and digital radiographic methods in determining root canal working length.
  
  
  METHODS
  Twenty-five maxillary incisor or canine teeth from 22 patients were used in this study. Considering the preoperative radiographs as the baseline, a 25 K file was inserted into the root canal to the point where the Root ZX electronic apex locator indicated the APEX measurement in the screen. From this measurement, 1 mm was subtracted for positioning the file. The radiographic measurements were made using a digital sensor (Digora 1.51) or conventional type-E films, size 2, following the paralleling technique, to determine the distance of the file tip and the radiographic apex.
  
  
  RESULTS
  The Student "t" test indicated mean distances of 1.11 mm to conventional and 1.20 mm for the digital method and indicated a significant statistical difference (p<0.05).
  
  
  CONCLUSIONS
  The conventional radiographic method was found to be superior to the digital one in determining the working length of the root canal.
authors.affiliation: Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil. faorosco@usp.br
authors.forename: Fernando Accorsi
authors.initials: FA
authors.lastname: Orosco
authors.forename: Norberti
authors.initials: N
authors.lastname: Bernardineli
authors.forename: Roberto Brandão
authors.initials: RB
authors.lastname: Garcia
authors.forename: Clovis Monteiro
authors.initials: CM
authors.lastname: Bramante
authors.forename: Marco Antonio Húngaro
authors.initials: MA
authors.lastname: Duarte
authors.forename: Ivaldo Gomes de
authors.initials: IG
authors.lastname: Moraes
mesh_terms: D003762:Dental Instruments; D003786:Dental Pulp Cavity / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D004582:Electronics, Medical / Q000295:instrumentation; D006801:Humans; D009811:Odontometry / Q000295:instrumentation; D009929:Organ Size; D019252:Radiography, Dental, Digital / Q000379:methods*; D015203:Reproducibility of Results; D018915:Root Canal Preparation / Q000295:instrumentation / Q000379:methods; D019227:Tooth Apex / Q000033:anatomy & histology / Q000000981:diagnostic imaging*