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Invesitgating the mechanisms of the relationship between oral status and cognitive function using large cohort data and estimating causal effects

Research Project

Project/Area Number 22K20984
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0907:Oral science and related fields
Research InstitutionTohoku University

Principal Investigator

Kiuchi Sakura  東北大学, 学際科学フロンティア研究所, 助教 (30963061)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords認知機能 / 口腔 / 認知症 / コホート研究 / 因果推論
Outline of Research at the Start

口腔状態の悪化が認知症発症に影響を与える可能性が示唆されている。その経路として、脳への刺激の低下、歯周病の炎症、栄養摂取の低下、社会活動の低下がある。これまで個別にメカニズムの検討はなされているが、その影響の大きさを同時に比較することはできておらず、口腔状態と認知症発症との関連は示されているものの、その因果関係については明らかではない。本研究では、どの経路の影響が大きいのかを定量化し、口腔状態の悪化から認知症発症への因果効果を推定する。

Outline of Final Research Achievements

The Panel on Health and Ageing of Singaporean Elderly (PHASE) with three-point survey data were used to examine the association between the number of teeth and cognitive function. We applied the Longitudinal Modified Treatment Policy approach. A total of 1,516 participants were included in the analysis, excluding those with severe cognitive decline. Emulated tooth loss prevention interventions were associated with better cognitive function score. Therefore, preventing tooth loss could potentially benefit maintenance of cognitive function among older adults.

Academic Significance and Societal Importance of the Research Achievements

高齢者において機能的歯列(20本以上)を維持することが認知機能の改善につながる可能性が示唆された。認知機能の改善は、研究対象者を20本以上に予防介入した場合に一番大きく、単に10本以上の歯を残すことだけでは、認知機能の大きな改善にはつながらなかった。機能歯列の維持は、高齢になってからの介入では達成が困難であるため、幼少期からの歯の喪失予防が重要である。そのためには、フッ化物使用や、砂糖や喫煙といったリスクファクターへの対策が必要であると考えられる。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (6 results)

All 2023 2022 Other

All Int'l Joint Research (1 results) Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 2 results)

  • [Int'l Joint Research] CARE/Duke-NUS Medical School/NDRIS(シンガポール)

    • Related Report
      2022 Research-status Report
  • [Journal Article] Effect of tooth loss on cognitive function among older adults in Singapore2023

    • Author(s)
      S. Kiuchi, U. Cooray, J. Aida, K Osaka, A Chan, R Malhotra, M. A. Peres
    • Journal Title

      Journal of Dental Research

      Volume: -

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Education‐related inequalities in oral health among older adults: Comparing Singapore and Japan2023

    • Author(s)
      Kiuchi Sakura、Aida Jun、Cooray Upul、Osaka Ken、Chan Angelique、Malhotra Rahul、Peres Marco A.
    • Journal Title

      Community Dentistry and Oral Epidemiology

      Volume: - Issue: 4 Pages: 671-679

    • DOI

      10.1111/cdoe.12846

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 地域住民コホート調査によるメタボロームと認知機能低下の関連2023

    • Author(s)
      木内桜、中谷久美、竹内研時、小柴生造、麦倉俊司、小坂健、寳澤篤
    • Organizer
      第82回日本公衆衛生学会総会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Tooth Loss Affects Cognitive Function among Older Adults in Singapore2023

    • Author(s)
      S. Kiuchi, U. Cooray, J. Aida, K Osaka, A Chan, R Malhotra, M. A. Peres
    • Organizer
      International Association for Dental Research
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Education-related Inequalities in Oral Health in Two Asian Countries2022

    • Author(s)
      S. Kiuchi, J. Aida, U. Cooray, K. Osaka, A. Chan, R. Malhotra, M. A. Peres
    • Organizer
      International Association for Dental Research
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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Published: 2022-09-01   Modified: 2025-01-30  

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