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Application of intraoral digital X-ray system for personal identification - A pilot study of a computer network for dental identification in mass disaster victim identification -

Research Project

Project/Area Number 10671953
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 矯正・小児・社会系歯学
Research InstitutionNihon University

Principal Investigator

ABOSHI Hirofumi  Nihon University, School of Dentistry, Assistant Professor, 歯学部, 講師 (60212560)

Co-Investigator(Kenkyū-buntansha) TAKAHASHI Toyoko  Nihon University, School of Dentistry, Instructor, 歯学部, 助手 (50120499)
KOMURO Toshinobu  Nihon University, School of Dentistry, Professor, 歯学部, 教授 (50139200)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥2,700,000 (Direct Cost: ¥2,700,000)
KeywordsPersonal identification / Digital image / Radiography / Forensic odontology / Age estimation / Lower first premolar / Canine / Dental root pulp cavity / デジタル / X-ray
Research Abstract

To enable use of intraoral digital X-ray facilities in forensic casework, fixed desktop equipment must be made mobile and portable. All computer software will function adequately via a laptop computer, but the mechanism for radiograph exposure and the synchronisation of circuit signals may require adaptation. This conversion was performed, using an AC adapter with sensor to permit indirect mutual threshold level adjustment and the sytem tsted. The accompanying software did not permit direct Web access. To permit transmission of a full mouth digital X-ray image by email, compression (e.g. JPEG) was carried out after importing the image into editor software. The quality of the recovered images was poor, particularly in the areas of the dental pulp and bone trabeculae. Images of adequate quality were produced when segmented images were exported.
In an additional application of this system for forensic casework the authors developed an age estimation method based on the morphometric analysis of the dental root pulp. Extracted lower first and second premolars were used for this study. Digital images of the pulp from buccolingual and mesiodistal aspects were recorded and the root and pulp widths measured at 6 levels on both buccal and mesial surfaces. The ratios between the widths of the pulp and the root were used as variables for multiple regression analysis. The coefficient of multiple regression,r, was 0.89 for the first and 0.82 for second premolars. In a further study, digitl images of the pulp in buccolingual, 45-degree and mesiodistal aspects of upper and lower canines were recorded and similarly analyzed. The coefficient of multiple regression, r, was 0.84 for upper, 0.72 for lower and 0.78 for all canines. In a practical application, digital images of the pulp from the buccolingual aspect only of lower teeth were used for dental age determination. The coefficient of multiple regression, r, was 0.71.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] Aboshi, H.: "A Method of Age Estimation Based on the Morphometric Analysis of Dental Pulp Using a Digital X-Ray System"6th Indo Pacific Congress on Legal Medicine and Forensic Sciences. 894-897 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 岡村浩一: "歯科用デジタルX線撮影装置を用いた犬歯の根管幅からの年齢推定"日大歯学. 73. 330-337 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Aboshi, H., Mukoyama, R., Kawano, S., Takahashi, T., Komuro, T., Arai, Y. and Shinoda, K.: "A Method of Age Estimation Based on the Morphometric Analysis of Dental Pulp Using a Digital X-Ray System"6th Indo Pacific Congress on Legal Medicine and Forensic Sciences, INPALMS-1998-KOBE. 894-897 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Okamura, K.: "A method of age estimation based on root canal width using an intraoral digital X-ray system"Nihon Univ. Dent. J.. 73. 330-337 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Aboshi,H.: "A Method of Age Estimation Based on the Morphometric Analysis of Dental Pulp Using a Digital X-Ray Sustem."6th Indo Pacific Congress on Legal Medicine and Forensic Sciences. 894-897 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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