title: A Digital Stereomicroscopic Study of the Radicular Wall Thickness of Two-Canal Mandibular Incisors.
abstract: OBJECTIVE
  This study aimed to assess the radicular wall thickness in mandibular incisors with two canals and find the maximum and minimum thickness to prevent root canal treatment (RCT) procedural errors.
  
  
  METHODS
  A total of 160 extracted mandibular incisors were selected and radiographed; out of which, 55 had two canals. Three parallel transverse sections were made in each tooth at 1mm below the cementoenamel junction (CEJ), mid-root and 1 millimeter to the apex. Specimens were evaluated under a stereomicroscope and the thickness of radicular walls in each section was determined for the buccal, lingual and proximal surfaces. Data were statistically analyzed using Pearson's correlation coefficient test.
  
  
  RESULTS
  The thickness of radicular wall decreased from the cervical towards the apex. In all three sections (cervical, mid-root and apical), the thickness of lingual wall was significantly greater than the buccal wall. Also, the thickness of buccal and lingual walls was significantly higher than that of the proximal walls.
  
  
  CONCLUSIONS
  The lingual radicular wall had the highest thickness in two-canal mandibular incisors. Therefore, in these teeth, the lingual canal is a better choice for post placement.
authors.affiliation: Professor, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Department of Endodontics, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran; Iranian Center for Endodontic Research, Tehran, Iran.
authors.forename: Sedigheh
authors.initials: S
authors.lastname: Khedmat
authors.affiliation: Undergraduate Student, School of Dentistry, International Campus of Tehran University of Medical Sciences. Tehran, Iran.
authors.forename: Sohayla
authors.initials: S
authors.lastname: Mohamadian
authors.affiliation: Assistant Professor, Department of Endodontics, School of Dentistry, International Campus of Tehran University of Medical Sciences. Tehran, Iran.
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Dibaji
authors.affiliation: Epidemiologist, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Mohamad Javad
authors.initials: MJ
authors.lastname: Kharrazifard
keywords: Dentin; Root Canal; Thickness; Tooth Root