[Effect of anterior-lateral mandibular displacement occurring in lateral roentgenocephalometry at the open mouth position on the linea measurements].

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  • Author(s): Ichida T; Itoh Y; Nodai E; Fujita K; Sato M
  • Source:
    Nihon Kyosei Shika Gakkai zasshi = The journal of Japan Orthodontic Society [Nihon Kyosei Shika Gakkai Zasshi] 1989 Aug; Vol. 48 (4), pp. 443-53.
  • Publication Type:
    Journal Article
  • Language:
    Japanese
  • Additional Information
    • Source:
      Publisher: Japan Orthodontic Society Country of Publication: Japan NLM ID: 0055371 Publication Model: Print Cited Medium: Print ISSN: 0021-454X (Print) Linking ISSN: 0021454X NLM ISO Abbreviation: Nihon Kyosei Shika Gakkai Zasshi
    • Publication Information:
      Publication: Tokyo : Japan Orthodontic Society
      Original Publication: [Tōkyō] : Dō Gakkai,
    • Subject Terms:
      Cephalometry* ; Diagnostic Errors*; Mandible/*diagnostic imaging ; Radiography, Dental/*methods; Adult ; Child ; Craniology ; Humans ; Reproducibility of Results ; Skull/anatomy & histology
    • Abstract:
      The present study was undertaken to determine the effect of mandibular displacement occurring in lateral roentgenocephalometry at the open mouth position and of the resulting changes in the projected sites on linea measurements of the mandible. With use of a brachicephalic young (corresponding to age 7) and a dolichocephalic adult human dried mandible, lateral roentgenocephalograms taken under different conditions with angles and distances varied, simulating clinical lateral roentgenocephalometry at the open mouth position, were compared and studied. The results were as follows: 1. Displacement from 5 mm to 30 mm perpendicular to the central X-ray caused unfixed changes, presumed to be human errors in measuring, in the following ranges; brachicephaly: 0-1.4%, dolichocephaly: 0-0.9%. 2. As angles of rotation perpendicular to the central X-ray increase from 0 to 10 degrees clockwise, significant reduction in inverse proportion to the increase in angles of rotation were found; Cd-Gna: brachicephaly: 1.3%, dolichocephaly: 0.9-1.4%; Go-Gna: brachicephaly: 1.6-3.3%, dolicocephaly: 1.4-2.2%. However, unfixed changes in the following ranges were found for Cd-Go; brachicephaly: 0.5-2.3%, dolicocephaly: 0.6-1.2%. 3. Increase in angles of rotation counterclockwise also showed a similar tendency to that in clockwise rotation.
    • Publication Date:
      Date Created: 19890801 Date Completed: 19900920 Latest Revision: 20161123
    • Publication Date:
      20231215
    • Accession Number:
      2640926