title: Effect of Amperage and Field of View on Detection of Vertical Root Fracture in Teeth with Intracanal Posts.
abstract: BACKGROUND
  This study sought to assess the effects of amperage (mA) and field of view (FOV) on intracanal metal post artifacts and the diagnostic parameters for detection of vertical root fracture (VRF) in teeth with intracanal posts.
  
  
  METHODS
  In this diagnostic study, 80 human single-canal teeth were evaluated by cone-beam computed tomography (CBCT). Nickel chrome cast posts were placed into root canals after root canal therapy and canal preparation. In the test group, fracture was induced by an instron machine while no fracture was induced in the control group. Deterministic and probabilistic sensitivity and specificity values at different exposure settings were statistically analyzed using the one-way ANOVA and pairwise comparisons were performed by Tukey's test.
  
  
  RESULTS
  Significant differences were found between the two groups in terms of deterministic (P<0.0001) and probabilistic (P<0.013) sensitivity and deterministic (P<0.037) and probabilistic (P<0.0001) specificity at different FOV and mA combinations.
  
  
  CONCLUSIONS
  A smaller FOV and lower mA should be preferably used for detection of VRFs in teeth with intracanal posts.
authors.affiliation: Oral and Maxillofacial Radiology Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran;
authors.forename: Yaser
authors.initials: Y
authors.lastname: Safi
authors.affiliation: Students' Research Committee, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran;
authors.forename: Sepanta
authors.initials: S
authors.lastname: Hosseinpour
authors.affiliation: Oral and Dental Disease Research Center, Zahedan University of Medical Sciences, Zahedan, Iran;
authors.forename: Alireza
authors.initials: A
authors.lastname: Aziz
authors.affiliation: Dentist, Tehran, Iran.
authors.forename: Masoud
authors.initials: M
authors.lastname: Bamedi
authors.affiliation: Dentist, Tehran, Iran.
authors.forename: Mahsa
authors.initials: M
authors.lastname: Malekashtari
authors.affiliation: Oral and Maxillofacial Radiology Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran;
authors.forename: Zahra
authors.initials: Z
authors.lastname: Vasegh
keywords: Amperage; Cone-Beam Computed Tomography; Field of View; Metal Artifact; Vertical Root Fracture