title: Assessment of Root Perforation within Simulated Internal Resorption Cavities Using Cone-beam Computed Tomography.
abstract: BACKGROUND
  Internal root resorption lesions may perforate external root surfaces, which may not be detectable on conventional radiographic images. The purpose of this study was to evaluate the accuracy of cone-beam computed tomographic (CBCT) imaging in the detection of small perforations within simulated internal resorption cavities.
  
  
  METHODS
  Artificial internal root resorption cavities with minimal (0.1-0.2 mm) wall thickness were prepared at 64 sites on buccal and lingual halves of 32 single-rooted mandibular teeth that had been split mesiodistally. Perforations with 0.5-mm diameters were produced using a #40 K-file in half of the specimens. All teeth were placed in dry sheep mandibles and imaged using a NewTomVGi CBCT scanner (6 × 6 cm field of view, 0.1-mm resolution; NewTomQR srl, Verona, Italy). Two observers evaluated the images. Interexaminer and intraexaminer agreement were assessed using the kappa statistic. Sensitivity, specificity, and predictive values were used to assess diagnostic accuracy.
  
  
  RESULTS
  Intra- and interobserver agreement on perforation detection were high. The sensitivity and specificity of CBCT-based detection of perforation in internal root resorption were 81.3% and 84.4%, respectively.
  
  
  CONCLUSIONS
  CBCT imaging is useful for perforation detection in internal root resorption defects.
authors.affiliation: Department of Oral and Maxillofacial Radiology, Dental School, Shiraz University of Medical Science, Shiraz, Iran.
authors.forename: Leila
authors.initials: L
authors.lastname: Khojastepour
authors.affiliation: Department of Endodontics, Dental School, Shiraz University of Medical Science, Shiraz, Iran.
authors.forename: Fariborz
authors.initials: F
authors.lastname: Moazami
authors.affiliation: Private Practice, Karaj, Iran.
authors.forename: Mahbod
authors.initials: M
authors.lastname: Babaei
authors.affiliation: Dental Research Center and Department of Endodontics, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran. Electronic address: forghaniradm@mums.ac.ir.
authors.forename: Maryam
authors.initials: M
authors.lastname: Forghani
mesh_terms: D000818:Animals; D054893:Cone-Beam Computed Tomography; D006801:Humans; D019252:Radiography, Dental, Digital; D012391:Root Resorption / Q000000981:diagnostic imaging*; D012680:Sensitivity and Specificity; D012756:Sheep; D014092:Tooth Root / Q000000981:diagnostic imaging*
keywords: Cone-beam computed tomographic imaging; internal root resorption; radiography; root perforation