title: Evaluation of the Root ZX apex locator in primary teeth.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the accuracy of the Root ZX electronic apex locator in determining canal length in primary incisors.
  
  
  METHODS
  Root ZX was utilized to measure the canal lengths of 150 primary incisors in vivo. After the teeth were extracted, a standard ruler was used to measure the canal lengths to the nearest 0.5 mm. A paired t test was used to compare the lengths obtained in vivo with Root ZX and the lengths measured in vitro.
  
  
  RESULTS
  In 98 (65%) of the canals, the length measured by Root ZX was determined to be equal to the length measured in vitro. Root ZX measurements were found to be less than in vitro measurements by 0.5 mm in 24 canals (16%), and were greater than in vitro measurements by 0.5 mm in 21 canals (14%). Root ZX measurements exceeded in vitro measurements by 1.0 to 1.5 mm in 5 canals (3%) and were less than in vitro measurements by 1.0 mm in 2 canals (1%). Paired t test analysis indicated no significant difference between the 2 measurement methods (P=.67).
  
  
  CONCLUSIONS
  Root ZX can accurately assess the length of canals in primary incisors.
authors.affiliation: Department of Pediatric Dentistry, UCLA School of Dentistry, Los Angeles, Calif, USA. ghaemsara@yahoo.com
authors.forename: Sara
authors.initials: S
authors.lastname: Ghaemmaghami
authors.forename: Jason
authors.initials: J
authors.lastname: Eberle
authors.forename: Donald
authors.initials: D
authors.lastname: Duperon
mesh_terms: D002648:Child; D019140:Dental Care for Children / Q000295:instrumentation*; D003762:Dental Instruments; D003786:Dental Pulp Cavity / Q000033:anatomy & histology; D006801:Humans; D007180:Incisor; D009811:Odontometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D018915:Root Canal Preparation / Q000295:instrumentation; D012680:Sensitivity and Specificity; D019227:Tooth Apex / Q000033:anatomy & histology*; D014094:Tooth, Deciduous