title: Working Length Determination of Root Canal of Young Permanent Tooth: An In vitro Study.
abstract: BACKGROUND
  Determination of correct working length is one of the keys to success in endodontic therapy.
  
  
  OBJECTIVE
  The aim of this study was to evaluate the diagnostic efficacy of various methods to determine working length of root canal.
  
  
  METHODS
  Tactile method was assessed using digital radiography and compared with electronic method using apex locator. A total sample of 30 single rooted young permanent teeth the (mandibular first premolars) with matured apices were selected for the study. Access cavity preparation was carried out. Working length was measured by tactile method using digital radiography and electronic method using apex locator with no 15 K file. Actual working length was established by grinding of cementum and dentine from the root apex and was observed under stereomicroscope. Data was collected and statistical analysis was carried out with the help of SPSS-15.
  
  
  RESULTS
  The results of this study showed that there was a significant difference between tactile method assessed by digital radiography and electronic method using apex locator.
  
  
  CONCLUSIONS
  Apex locator was found to be more reliable and accurate when compared with the actual length.
authors.affiliation: Department of Pedodontics and Preventive Dentistry, Faculty of Dental Science, Nadiad, Gujarat, India.
authors.forename: A
authors.initials: A
authors.lastname: Diwanji
authors.affiliation: Department of Pedodontics and Preventive Dentistry, Govt. Dental College, Jaipur, Rajasthan, India.
authors.forename: As
authors.initials: A
authors.lastname: Rathore
authors.affiliation: Department of Pedodontics and Preventive Dentistry, Darshan Dental College, Udaipur, India.
authors.forename: R
authors.initials: R
authors.lastname: Arora
authors.affiliation: University of Maryland School of Dentistry, Washington DC, USA.
authors.forename: V
authors.initials: V
authors.lastname: Dhar
authors.affiliation: Department of Oral and Maxillofacial Pathology, Institute of Dental Sciences, Bareilly, Uttar Pradesh, India.
authors.forename: A
authors.initials: A
authors.lastname: Madhusudan
authors.affiliation: Department of Orthodontics and Dentofacial Orthopedics, Pacific Dental College and Hospital, Udaipur, Rajasthan, India.
authors.forename: J
authors.initials: J
authors.lastname: Doshi
keywords: Apex locator; Digital radiography; Stereomicroscope; Working length determination