Sleep bruxism and its relationship to sleep habits and lifestyle of elementary school children in Japan

Authors

  • Sachiko SUWA,

    Corresponding author
    1. Department of Craniofacial Growth and Development Dentistry,
    2. Research Center of Brain and Oral Science, Kanagawa Dental College, Kanagawa,
      Dr Sachiko Suwa, Department of Craniofacial Growth and Development Dentistry, Kanagawa Dental College, 82 Inaoka-Cho, Yokosuka, Kanagawa 238-8580, Japan. Email: suwa@kdcnet.ac.jp
    Search for more papers by this author
  • Madoka TAKAHARA,

    1. Department of Craniofacial Growth and Development Dentistry,
    2. Research Center of Brain and Oral Science, Kanagawa Dental College, Kanagawa,
    Search for more papers by this author
  • Shuichiro SHIRAKAWA,

    1. National Institute of Mental Health, National Center of Neurology and Psychiatry, and
    Search for more papers by this author
  • Yoko KOMADA,

    1. Department of Somnology, Tokyo Medical University, Tokyo, Japan
    Search for more papers by this author
  • Kenichi SASAGURI,

    1. Department of Craniofacial Growth and Development Dentistry,
    2. Research Center of Brain and Oral Science, Kanagawa Dental College, Kanagawa,
    Search for more papers by this author
  • Minoru ONOZUKA,

    1. Research Center of Brain and Oral Science, Kanagawa Dental College, Kanagawa,
    Search for more papers by this author
  • Sadao SATO

    1. Department of Craniofacial Growth and Development Dentistry,
    2. Research Center of Brain and Oral Science, Kanagawa Dental College, Kanagawa,
    Search for more papers by this author

Dr Sachiko Suwa, Department of Craniofacial Growth and Development Dentistry, Kanagawa Dental College, 82 Inaoka-Cho, Yokosuka, Kanagawa 238-8580, Japan. Email: suwa@kdcnet.ac.jp

Abstract

This cross-sectional study was conducted to investigate the influence of sleep habits, sleep problems, and lifestyle on sleep bruxism in Japanese elementary school children. In study 1, to confirm the reliability of replies provided by parents on children's sleep bruxism, we compared the scale of sleep bruxism frequency from questionnaires with actual sleep bruxism tooth wear in 49 elementary school children (22 males and 27 females). In study 2, a total of 1956 children (973 males, 983 females; mean age, 8.8 ± 1.8 years) and parents living in metropolitan Tokyo participated. Parents answered questionnaires on sleep habits, sleep problems, and lifestyle. Participants were classified as severe bruxism group (s-Bx) and non-severe bruxism group (ns-Bx) according to the frequency of sleep bruxism. The six grades were summarized into three categories: 1st/2nd grades (grades 1/2), 3rd/4th grades (grades 3/4), and 5th/6th grades (grades 5/6). The results suggest that the incidence of sleep bruxism in Japanese children living in Tokyo is strongly related to the disturbance of sleep habits and psychological stress, which can be caused by an owl-type lifestyle in children and parents.

Ancillary