title: [Observations on three dimensional images for cracks of doweled teeth--comparison of images from specimen sections and dental tomograms from small three dimensional X-ray CT].
abstract: OBJECTIVE
  Intraoral views of teeth with dowel and post hole taken by small three-dimensional X-ray CT (3DX) were compared with three-dimensional images from specimen sections of the same extracted teeth. This comparison shows the usefulness of 3DX for examination of cracked teeth in the oral cavity.
  
  
  METHODS
  After taking dental tomographic images using 3DX for fractured teeth in the oral cavity, the fractured teeth were extracted and three-dimensional images for them and their cracks were obtained from a set of photographed sections. Then both sets of three-dimensional images for the fractured teeth were compared in terms of the form and region of the cracks.
  
  
  CONCLUSIONS
  The tooth cracks were observed at the root face region in the intraoral view. Also, in the extracted teeth, fracture lines were recognized from the three-dimensional images. Moreover, a discontinuous image was obtained in teeth from the dental tomographic image using 3DX. This discontinuous image in teeth was observed in the same region and direction as the cracks of the three dimensional image from specimen sections of the extracted teeth.
  
  
  CONCLUSIONS
  The discontinuous images of teeth in the dental tomographic images from 3DX were observed in the same region and direction as the cracks of teeth in the three-dimensional images from specimen sections of the extracted teeth. It was confirmed that dental tomographic images from 3DX are useful for finding cracks in living teeth. However, dental tomographic images from small three-dimensional X-ray CT are not perfectly reliable because the discontinuous image is not found in some teeth where the cracks are recognized by images from specimen sections after extraction.
authors.affiliation: The Second Department of Prosthetic Dentistry, Matsumoto Dental University. info-crown@po.mdu.ac.jp
authors.forename: Hiroko
authors.initials: H
authors.lastname: Misawa
authors.forename: Soichiro
authors.initials: S
authors.lastname: Tsuchiya
authors.forename: Norichika
authors.initials: N
authors.lastname: Sasaki
authors.forename: Takahiro
authors.initials: T
authors.lastname: Hagihara
authors.forename: Youhei
authors.initials: Y
authors.lastname: Fujiseki
authors.forename: Junichi
authors.initials: J
authors.lastname: Takayama
authors.forename: Noboru
authors.initials: N
authors.lastname: Fujisaki
authors.forename: Ikufumi
authors.initials: I
authors.lastname: Kurasawa
authors.forename: Mitsuharu
authors.initials: M
authors.lastname: Amari
authors.forename: Kazunari
authors.initials: K
authors.lastname: Ohshima
mesh_terms: D006801:Humans; D021621:Imaging, Three-Dimensional; D011176:Post and Core Technique; D011861:Radiography, Dental / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014070:Tooth / Q000000981:diagnostic imaging* / Q000473:pathology; D014081:Tooth Extraction; D014082:Tooth Fractures / Q000000981:diagnostic imaging* / Q000473:pathology