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Differential Recovery Patterns of the Maxillofacial bone and muscles after eliminating nasal obstruction in growing rats

Research Project

Project/Area Number 20K10198
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 57070:Developmental dentistry-related
Research InstitutionTokyo Medical and Dental University

Principal Investigator

Yonemitsu Ikuo  東京医科歯科大学, 大学院医歯学総合研究科, 助教 (00431940)

Co-Investigator(Kenkyū-buntansha) 清水 康広  東京医科歯科大学, 歯学部, 非常勤講師 (60631968)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords鼻呼吸障害 / 上顎骨 / 下顎骨 / 咀嚼筋 / 顎顔面成長 / 回復 / 成長発育 / 顎関節
Outline of Research at the Start

本研究では、成長期ラット鼻呼吸障害モデルを用いる。4週齢より飼育開始し、鼻閉群は片側鼻孔を閉塞することで鼻呼吸障害モデルとする。対照群、鼻閉群に加え、回復群については、その回復時期を1, 3, 5, 7週後に設定し、各群13週齢にて屠殺し観察する。
組織生化学的手法を駆使し、咀嚼筋の筋線維タイプ改変および筋収縮力変化と、下顎頭軟骨における軟骨内骨化と軟骨直下の骨吸収、顎顔面領域の骨形態変化を統合的に解析することで、鼻呼吸障害に伴う不正咬合のメカニズムとその治療意義および最適な治療時期の解明を考えている。

Outline of Final Research Achievements

Nasal obstruction during growth has a suppressive effect on maxillofacial growth, however, there are no previous studies that have clarified whether it is possible to recover to the normal growth volume by improving nasal obstruction and the optimal timing of its treatment. In this study, we clarified these issues using a rat model for restoring nasal obstruction.
Forty-two 4-week-old male Wistar rats were randomly divided into six groups (C, W1, W3, W5, W7 and W9) according to the timing of recovery(n=7). The left nostril was sutured and removed to reproduced unilateral nasal obstruction and its recovery. Morphological growth recovery of the maxillary and mandibular bones and masticatory muscles were observed when the nasal breathing disorder was recovered, suggesting that the optimal timing for each area.

Academic Significance and Societal Importance of the Research Achievements

鼻閉は口呼吸を誘発し、全身に様々な悪影響を与えることが報告されている。鼻閉モデルを用いた基礎研究において、咀嚼筋の成長阻害を介した下顎骨・下顎頭成長の抑制が明らかにされてきた。しかし、鼻呼吸障害に対する介入による顎顔面への影響や、その成長回復が何歳まで期待できるかという臨界期を明らかにした研究は存在しない。
本研究において、成長期ラット鼻呼吸障害モデルを用いて、鼻閉塞解除後に顎顔面形態が正常な成長を遂げるかを明らかにし、形態学的および組織学観点から最適な介入時期を明らかにしたことは、小児の顎顔面成長を明らかにする上で、大変重要な意義を与えるものと考える。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (10 results)

All 2022 2021 Other

All Int'l Joint Research (3 results) Journal Article (4 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (2 results) Book (1 results)

  • [Int'l Joint Research] ジュネーブ大学 歯学部 矯正歯科(スイス)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] ジュネーブ大学歯学部矯正歯科(スイス)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] ジュネーブ大学歯学部矯正歯科(スイス)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Differential Recovery Patterns of the Maxilla and Mandible after Eliminating Nasal Obstruction in Growing Rats2022

    • Author(s)
      Keitoku Mirei、Yonemitsu Ikuo、Ikeda Yuhei、Tang Huan、Ono Takashi
    • Journal Title

      Journal of Clinical Medicine

      Volume: 11 Issue: 24 Pages: 7359-7359

    • DOI

      10.3390/jcm11247359

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Influence of different ligation methods on force and moment generation in a simulated condition of the maxillary crowded anterior dentition with linguo-version and rotation2022

    • Author(s)
      Kim Sunmin、Yonemitsu Ikuo、Takemura Hiroshi、Shimoda Kunio、Suga Kazuhiro、Soga Kohei、Ono Takashi、Uo Motohiro
    • Journal Title

      Bio-Medical Materials and Engineering

      Volume: 33 Issue: 6 Pages: 453-463

    • DOI

      10.3233/bme-211288

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Effect of rhodium plating on the ion dissolution from nickel-titanium and pure nickel wires2022

    • Author(s)
      Cho Edward、Kanno Zuisei、Yonemitsu Ikuo、Kiyokawa Hajime、Ohira Nobutaka、Ono Takashi、Uo Motohiro
    • Journal Title

      Asian Pacific Journal of Dentistry

      Volume: 22 Issue: 2 Pages: 21-28

    • DOI

      10.47416/apjod.22-0290

    • ISSN
      2185-3479, 2185-3487
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 改良型超弾性Ni-Ti合金ワイヤーおよびβチタン合金ワイヤーの特徴2022

    • Author(s)
      小野卓史、 米満郁男
    • Journal Title

      日本歯科理工学会誌

      Volume: 41巻1号

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Presentation] Reversible effects of functional mandibular lateral shift on masticatory muscles in the growing rats2022

    • Author(s)
      Guan Hao, Yonemitsu Ikuo, Ikeda Yuhei, Ono Takashi
    • Organizer
      第81回日本矯正歯科学会学術大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 成長期ラットにおける鼻呼吸障害の回復がもたらす上下顎骨の形態学的変化とその最適時期の解明2021

    • Author(s)
      慶徳 美怜, 米満 郁男, 池田 侑平, 湯 歓, 小野 卓史
    • Organizer
      第80回日本矯正歯科学会学術大会
    • Related Report
      2021 Research-status Report
  • [Book] 歯科衛生士・歯科助手 おしごとハンドブック2022

    • Author(s)
      岩田隆紀、水谷幸嗣、岩野義弘、松浦孝典
    • Total Pages
      256
    • Publisher
      クインテッセンス出版
    • ISBN
      9784781208602
    • Related Report
      2022 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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