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2011 Fiscal Year Final Research Report

The evaluation of the effect of the occlusion on the masticatory muscle using H-MRI and P-MRS.

Research Project

  • PDF
Project/Area Number 21592389
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Pathobiological dentistry/Dental radiology
Research InstitutionKyushu University

Principal Investigator

CHIKUI Toru  九州大学, 歯学研究院, 准教授 (10295090)

Co-Investigator(Kenkyū-buntansha) OKAMURA Kazutoshi  九州大学, 大学院・歯学研究院, 助教 (20346802)
KAWAZU Toshiyuki  九州大学, 大学病院, 助教 (20294960)
T0KUM0RI Ken. ji  九州大学, 大学病院, 助教 (40253463)
YOSHIURA Kazunori  九州大学, 大学院・歯学研究院, 教授 (20210643)
Project Period (FY) 2009 – 2011
Keywords咬筋 / 拡散テンソル / T2値
Research Abstract

We evaluated the effects of various task like jaw opening, jaw closure and tooth contact on the masseter muscle by using both MRI and MRS. The eigenvalues of the diffusion tenser were affected by the jaw position. Moreover, recruitment of the specific muscle fibers within the masseter muscle was reflected in differing changes at the different position. The T 2 of the masseter muscle was expected to decrease with contraction because the increased intramuscular pressure caused the decrease of per fusion and to increase rapidly after the contraction, because of the reactive hyperemia. After the rapid increase, it decreased gradually. Finally, we evaluated the Pi/PCr ratio, which was indicative of the concentration of ADP by using 31P-MRS. It increase during tooth contact, however, it decrease immediately after tooth contact, and after 5 minutes, it declined to the same level as at rest.

  • Research Products

    (7 results)

All 2012 2011 2010

All Journal Article (4 results) (of which Peer Reviewed: 4 results) Presentation (3 results)

  • [Journal Article] Evaluation of diffusion parameters and T2 values of the masseter muscle during jaw opening2012

    • Author(s)
      Shiraishi T, Chikui T, Inadomi D, Kagawa T, Yoshiura K, Yuasa K.
    • Journal Title

      clenching, and rest

      Volume: 53(1) Pages: 81-86

    • Peer Reviewed
  • [Journal Article] Evaluation of T2 values and apparent diffusion coefficient of the masseter muscle by clenching2011

    • Author(s)
      Shiraishi T, Chikui T, Yoshiura K, Yuasa K.
    • Journal Title

      Dentomaxillofac Radiol

      Volume: 40(1) Pages: 35-41

    • Peer Reviewed
  • [Journal Article] Assessment of the sequential change of the masseter muscle by clenching : a quantitative analysis of Tl, T2, and the signal intensity of the balanced steady-state free precession2010

    • Author(s)
      Chikui T, Shiraishi T, Tokumori K, Inatomi D, Hatakenaka M, Yuasa K, Yoshiura K.
    • Journal Title

      Acta Radiol

      Volume: 51(6) Pages: 669-678

    • Peer Reviewed
  • [Journal Article] Effect of clenching on T2 and diffusion parameters of the masseter muscle2010

    • Author(s)
      Chikui T, Shiraishi T, Ichihara T, Kawazu T, Hatakenaka M, Kami Y, Yuasa K, Yoshiura K.
    • Journal Title

      Acta Radiol

      Volume: 51(1) Pages: 58-63

    • Peer Reviewed
  • [Presentation] Assessment of masseter muscle bydiffusion tensor Imaging2011

    • Author(s)
      Shiraishi T, Chikui T, et al
    • Organizer
      第18回国際歯顎顔面放射線学会
    • Place of Presentation
      Hiroshima
    • Year and Date
      2011-05-27
  • [Presentation] Evaluation of diffusion parameters of the masseter muscle at rest, opening and during clenching2010

    • Author(s)
      Shiraishi T, Chikui T, Yoshiura K, Yuasa K.
    • Organizer
      第8回:アジアロ腔顎顔面放射線学会議
    • Place of Presentation
      Seoul
    • Year and Date
      20101114-16
  • [Presentation] 咬合による咬筋のT_l値、T_2値、balanced SSFPの信号強度の変化の検討2010

    • Author(s)
      筑井徹
    • Organizer
      第29回日本画像医学会
    • Place of Presentation
      東京
    • Year and Date
      2010-02-27

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Published: 2013-07-31  

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