title: Influence of voxel size and scan field of view on fracture-like artifacts from gutta-percha obturated endodontically treated teeth on cone-beam computed tomography images.
abstract: OBJECTIVE
  To determine the optimal scan settings (scan mode and position of field of view [FOV]) for cone beam computed tomography to reduce root fracture-like artifacts that are often observed in teeth filled with gutta-percha cones (GPCs).
  
  
  METHODS
  Fracture-like artifacts that appeared on cone beam computed tomography images of 9 extracted human mandibular premolars filled with GPCs were analyzed using I-mode (FOV, 102 mm; voxel size, 0.2 mm) and D-mode (FOV, 51 mm; voxel size, 0.1 mm) settings.
  
  
  RESULTS
  The artificial lines were more obvious in I-mode than in D-mode. Increased distance between the center of the FOV and the GPCs produced stronger artificial lines in both I-mode and D-mode.
  
  
  CONCLUSIONS
  To reduce fracture-like artifacts, it is critical to use a mode with small voxel size and to place the target tooth in the center of the FOV.
authors.affiliation: Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan. Electronic address: Machapy@dent.tohoku.ac.jp.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Iikubo
authors.affiliation: Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Nishioka
authors.affiliation: Department of Oral and Maxillofacial Radiology and Diagnosis, Tsurumi University School of Dental Medicine, Yokohama, Japan.
authors.forename: Shintaro
authors.initials: S
authors.lastname: Okura
authors.affiliation: Department of Oral and Maxillofacial Radiology and Diagnosis, Tsurumi University School of Dental Medicine, Yokohama, Japan.
authors.forename: Kaoru
authors.initials: K
authors.lastname: Kobayashi
authors.affiliation: Department of Oral and Maxillofacial Radiology and Diagnosis, Tsurumi University School of Dental Medicine, Yokohama, Japan.
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Sano
authors.affiliation: Department of Oral Radiology, Asahi University School of Dentistry, Mizuho, Japan.
authors.forename: Akitoshi
authors.initials: A
authors.lastname: Katsumata
authors.affiliation: Department of Oral and Maxillofacial Radiology, Aichi-Gakuin University School of Dentistry, Nagoya, Japan.
authors.forename: Eiichiro
authors.initials: E
authors.lastname: Ariji
authors.affiliation: Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan.
authors.forename: Ikuho
authors.initials: I
authors.lastname: Kojima
authors.affiliation: Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan.
authors.forename: Maya
authors.initials: M
authors.lastname: Sakamoto
authors.affiliation: Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Sasano
mesh_terms: D016477:Artifacts; D001641:Bicuspid; D054893:Cone-Beam Computed Tomography; D006171:Gutta-Percha; D006801:Humans; D066298:In Vitro Techniques; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation; D014082:Tooth Fractures / Q000000981:diagnostic imaging*
chemical_list: D012387:Root Canal Filling Materials; D006171:Gutta-Percha