顎顔面形態が咬合力および咀嚼筋筋放電活動に及ぼす影響について : VII-3. 筋放電活動の非対称性指数と正貌顎顔面形態および偏側咀嚼指数との関連性  [in Japanese] The Influence of Craniofacial Form on Bite Force and EMG Activity of Masticatory Muscles : VII-3. Association between the Asymmetry Index of EMG Activity, and Frontal Dentoskeletal Form and the Lateralized Mastication Index  [in Japanese]

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Author(s)

    • 加納 昭彦 KANOU Akihiko
    • 日本大学歯学部歯科補綴学教室総義歯補綴学講座 Department of Complete Denture Prosthodontics, Nihon University School of Dentistry

Abstract

In this study, in order to investigate the association between frontal dentoskeletal form and the lateralized mastication index and masticatory EMG activity, the frontal form of 18 subjects who belonged to the normal face group was classified into left and right deviation groups, and the mechanisms of jaw function were analyzed by the lateralized mastication index and the asymmetry index of masticatory muscle EMG activity, and by investigating the associations by classifying the magnitude of bite force into 4 grades, the following conclusions were obtained.<BR>1. Correlation between the asymmetry index of masticatory muscle EMG activity and frontal dentoskeletal form<BR>Significant positive correlations were found in both groups in the posterior temporalis muscle with 100% MC for Me-ML, in the left deviation group with 75% MC for Me-ML, and in the right deviation group for the ∠Um-Um′. In the masseter muscle, there were significant positive correlations in both groups with from 50 to 100% MC for the ∠Um-Um′, 75 and 100% MC, respectively, for the ∠CG-Me, and 100% MC for Go-MLGo′ and Me-ML, and in the left deviation group, with 50% MC for Me-ML. Significant negative correlations were observed in the anterior temporalis muscle in both groups with 100% MC for the ∠Um-Um′ and Me-ML, and in the right deviation group with 75% MC for the ∠Um-Um′.<BR>2. Correlations between the asymmetry index of masticatory muscle EMG activity and the lateralized mastication index<BR>Significant positive correlations were found with 25% MC for the posterior temporalis muscle in the right deviation group and with 25 and 50% MC, respectively, for the masseter muscle in the two groups.<BR>Significant negative correlations were found with 25% MC for the anterior temporalis muscle in both groups.

Journal

  • Nihon Hotetsu Shika Gakkai Zasshi

    Nihon Hotetsu Shika Gakkai Zasshi 41(2), 252-260, 1997-04-01

    Japan Prosthodontic Society

References:  45

Cited by:  7

Codes

  • NII Article ID (NAID)
    10008165845
  • NII NACSIS-CAT ID (NCID)
    AN00197911
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    03895386
  • Data Source
    CJP  CJPref  J-STAGE 
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