3D Shape Measurement of Dental Casts Using Medical X-ray CT

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  • SOHMURA Taiji
    Division of Oromaxillofacial Regeneration, Course for Integrated Oral Sciences and Stomatology, Osaka University Graduate School of Dentistry
  • WAKABAYASHI Kazumichi
    Division of Oromaxillofacial Regeneration, Course for Integrated Oral Sciences and Stomatology, Osaka University Graduate School of Dentistry
  • LOWMUNKONG Rungnapa
    Division of Oromaxillofacial Regeneration, Course for Integrated Oral Sciences and Stomatology, Osaka University Graduate School of Dentistry
  • HOJO Hirokazu
    Osaka Dental University Department of Oral Diagnosis
  • KUSUMOTO Naoki
    Division of Oromaxillofacial Regeneration, Course for Integrated Oral Sciences and Stomatology, Osaka University Graduate School of Dentistry
  • OKUDA Hiroshi
    Division of Oromaxillofacial Regeneration, Course for Integrated Oral Sciences and Stomatology, Osaka University Graduate School of Dentistry
  • KOJIMA Tetsuya
    Division of Oromaxillofacial Regeneration, Course for Integrated Oral Sciences and Stomatology, Osaka University Graduate School of Dentistry
  • NAKAMURA Takashi
    Division of Oromaxillofacial Regeneration, Course for Integrated Oral Sciences and Stomatology, Osaka University Graduate School of Dentistry
  • YATANI Hirofumi
    Division of Oromaxillofacial Regeneration, Course for Integrated Oral Sciences and Stomatology, Osaka University Graduate School of Dentistry
  • TAKAHASHI Junzo
    Division of Oromaxillofacial Regeneration, Course for Integrated Oral Sciences and Stomatology, Osaka University Graduate School of Dentistry

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説明せつめい

Three-dimensional (3D) digitizing and computerization of dental casts is a trend in dentistry especially for orthodontics to substitute stone casts. Generally used laser scanners have a blind side in the measurement of undercuts. As alternative equipment that can digitize regardless of the undercut, the potential of recent multi-slice medical CT was examined. In 3D shape reconstruction, the CT window level affects the size of the object. It was examined, and a CT window level of 800 was found to be suitable. However, the size became slightly smaller than the real object. Then, a correction ratio of 1.002, 1.015 and 1.013 on the X-, Y- and Z-axis was given, and error within 0.08% was accomplished. The measurement and 3D imaging of dental casts was completed within 10min. The reproducibility of the complicated morphology of dental casts was slightly inferior to that of the latest laser scanners, but the accuracy and operationality regardless of the undercut is noteworthy for clinical application.

収録しゅうろく刊行かんこう物ぶつ

  • Dental Materials Journal

    Dental Materials Journal 23 (2), 121-128, 2004

    一般いっぱん社団しゃだん法人ほうじん　日本にっぽん歯科しか理工りこう学会がっかい

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