The mechanism for regulating the isometric contraction of masseter muscles is involved in determining the vertical dimension of occlusion

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  • Yuto Tanaka
    Department of Neuroscience and Oral Physiology, Osaka University Graduate School of Dentistry, Suita, Japan
  • Hajime Sato
    Department of Neuroscience and Oral Physiology, Osaka University Graduate School of Dentistry, Suita, Japan
  • Hiroki Toyoda
    Department of Neuroscience and Oral Physiology, Osaka University Graduate School of Dentistry, Suita, Japan
  • Mitsuru Saito
    Department of Neuroscience and Oral Physiology, Osaka University Graduate School of Dentistry, Suita, Japan
  • Yoshinobu Maeda
    Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Suita, Japan
  • Youngnam Kang
    Department of Neuroscience and Oral Physiology, Osaka University Graduate School of Dentistry, Suita, Japan

Abstract

<jats:p> Since 1934, the vertical dimension of occlusion (VDO) in edentulous individuals has been anatomically determined mostly by referring to the resting jaw position. However, such a static method is not always accurate. Considering the dynamic nature of clenching/mastication, it is desirable to determine VDO dynamically. We demonstrate that VDO can be accurately determined by measuring masseter EMG during the voluntary isometric contraction of jaw-closing muscles exerted against the ramp load in the jaw-opening direction. </jats:p>

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