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The comprehensive study of the causes of non carious cervical lesions and mandibular tori

Research Project

Project/Area Number 15570198
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Anthropology
Research InstitutionNihon University

Principal Investigator

IGARASHI Yuriko  Nihon University, Scholl of Dentistry at Matsudo, Lecturer (Full-Time), 松戸歯学部, 講師 (60277473)

Co-Investigator(Kenkyū-buntansha) MATUSE Miyoko  Nihon University, School of Dentistry at Matsudo, Associate Professor, 松戸歯学部, 助教授 (70165265)
SHIMIZU Takehiko  Nihon University, School of Dentistry at Matsudo, Lecturer (Full-Time), 松戸歯学部, 講師 (40328761)
KANAZAWA Eisaku  Nihon University, School of Dentistry at Matsudo, Professor, 松戸歯学部, 教授 (70050648)
KONDO Shintaro  Showa University, Scholl of Dentistry, Lecturer (Full-Time), 歯学部, 講師 (60186848)
YAMASHITA Masaki  Dokkyo Medical University, Department of Medicine, Research Assistant (Full-Time), 医学部, 助手 (80255009)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2005: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2004: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2003: ¥1,400,000 (Direct Cost: ¥1,400,000)
Keywordsnon carious cervical lesions / mandibular tori / present day Japanese / Jomon people / Kamakura people / modern Japanese / environmental causes / biomechanics / 現代人歯科患者 / 現代人大学生 / 環境因子 / 楔状欠損 / 下顎骨内面 / 口蓋隆起 / パプアニューギニア高地人
Research Abstract

The frequency and morphology of non carious cervical lesions (NCCL) were examined in Japanese isolated teeth (276 upper incisors, 179 upper canines). Before examinations, we defined a new classification system. NCCL were found in 38% of incisors and in 63% of canines. The shapes of NCCL were classified by the contour of sagittal section and by the contour on surface. In incisors and canines, different types of NCCL were found, and the causes of NCCL have been suggested to be different by the kind of tooth.
The frequency and morphology of mandibular torus, and the correlations between the development of tori (the class of tori and the size of the tori) and environmental factors (the number of teeth, the degree of crowding and the degree of dental attrition) were examined by skeletal materials of Jomon people, Kamakura people and modern Japanese people, plaster casts of present-day Japanese dental patients, present-day Japanese students and present-day Papua New Guinea Highlanders. Before examinations, we defined a new torus grading system. There were no statistically significant differences between males and females and between left sides and right sides in the distribution of torus classes and positions. 83.5% of Jomon people, 62.3% of Kamakura people, 64.8% of modern Japanese, 76.6% of present-day Japanese patients, 72.0% of present-day Japanese students, and 80% of present-day Papua New Guinea Highlanders had palpable tori. In Jomon people, tori were most frequently found under the second and first molars. In other groups, tori were most frequently found under the first and second premolars The development of tori has been suggested to positively correlated to the degree of dental attrition, the number of teeth, and age, and negatively correlated to the degree of crowding. Biomechanical study has suggested that tori develop in the mandible with more high density of compact bone.

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (12 results)

All 2006 2005 2004 Other

All Journal Article (10 results) Publications (2 results)

  • [Journal Article] 下顎隆起の出現状況の時代差とその要因2006

    • Author(s)
      五十嵐由里子 他4名
    • Journal Title

      Acta Anatomica Nipponica. 81

      Pages: 102-102

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 現代日本人における非齲蝕性硬組織欠損(楔状欠損)の頻度について(前歯)2005

    • Author(s)
      吉田覚 他
    • Journal Title

      解剖学雑誌 80・2

      Pages: 23-24

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The frequency of non carious cervical lesions in fore teeth in present day Japanese.2005

    • Author(s)
      Yoshida S. et al.
    • Journal Title

      Acta Anatomica Nippanica. 80-2

      Pages: 23-24

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Frequency of Mandibular Tori in Prezent Day Japanese.2005

    • Author(s)
      五十嵐由里子 他3名
    • Journal Title

      Anthropological Science 113.3

      Pages: 325-325

    • Related Report
      2005 Annual Research Report
  • [Journal Article] The Frequency of Mandibular Torus in Japanese.2005

    • Author(s)
      大関紗織 他2名
    • Journal Title

      Anthropological Science 113.3

      Pages: 325-325

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 現代日本人における非齲蝕性硬組織欠損(楔状欠損)の頻度について(前歯)2005

    • Author(s)
      吉田覚 他3名
    • Journal Title

      解剖学雑誌 80.2

      Pages: 23-24

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 現代日本人における非齲蝕性硬組織欠損(楔状欠損)の頻度について2004

    • Author(s)
      五十嵐由里子 他
    • Journal Title

      自然人類学研究 1

      Pages: 79-87

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The frequency of non carious cervical lesions in present day Japanese.2004

    • Author(s)
      Igarashi Y. et al.
    • Journal Title

      Physical Anthropology I

      Pages: 79-87

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The frequency of the Mandibular torus in present-day Japanese and Papua New Guinea Highlanders2004

    • Author(s)
      Yuriko Igarashi
    • Journal Title

      Anthropological Science 112-3

      Pages: 299-299

    • Related Report
      2004 Annual Research Report
  • [Journal Article] The frequency of the Mandibular torus and the causes of its formation.2004

    • Author(s)
      Yuriko Igarashi
    • Journal Title

      Anatomical Science International 79

      Pages: 91-91

    • Related Report
      2004 Annual Research Report
  • [Publications] IGARASHI Y, et al.: "Non-Carious Cervical Lesions of Upper Central Incisors in *** ****** ******** **********"Anthropological Science. 111.4. 422 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 五十嵐由里子 他: "現代日本人における非齲蝕性歯頸部硬組織欠損について"自然人類学研究. I. 79-87 (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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