Tonic activity of the human temporalis muscle at mandibular rest position

Yilmaz G., Uginčius P., Sebik O., Türker K. S.

Archives of Oral Biology, cilt.60, sa.11, ss.1645-1649, 2015 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 60 Sayı: 11
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.archoralbio.2015.08.013
  • Dergi Adı: Archives of Oral Biology
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1645-1649
  • Anahtar Kelimeler: Human, Jaw, EMG, Single motor unit, Wire electrodes
  • İstanbul Gelişim Üniversitesi Adresli: Hayır

Özet

Objective There are two theories on the control of the human mandibular rest position; the visco-elastic theory and the muscular theory. In this study, we have searched for evidence for the muscular theory. Design We have investigated the activity of the anterior temporalis muscle during various positions of the mandible using intramuscular electrodes. Results In nine out of ten subjects tonic activity in the anterior temporalis muscle during the mandibular rest position was observed. Most of these units ceased firing under the jaw dropped condition of the mandible. Conclusions Current findings support the muscular theory since single motor unit activity during the rest position of the mandible is observed in the anterior temporalis. We do not however have any evidence against the visco-elastic theory which may contribute in part to maintain the rest position of the mandible.