Oral Radiology

, Volume 25, Issue 1, pp 53–59 | Cite as

An oral rehabilitation robot for massaging the masseter and temporal muscles: a preliminary report

  • Yoshiko Ariji
  • Akitoshi Katsumata
  • Nobumi Ogi
  • Masahiro Izumi
  • Shigemitsu Sakuma
  • Yukihiro Iida
  • Yuichiro Hiraiwa
  • Kenichi Kurita
  • Chinami Igarashi
  • Kaoru Kobayashi
  • Hiroyuki Ishii
  • Atsuo Takanishi
  • Eiichiro Ariji
Original Article



This study determined suitable conditions for masseter and temporal muscle massage using a specially fabricated robot and evaluated its effects on patients with TMJ dysfunction associated with myofascial pain.


The robot was designed with two arms with six degrees-of-freedom, and equipped with plungers. A phase-1 trial examined 22 healthy volunteers to determine its safety and suitable massage pressure, examining three different pressures. The volunteers evaluated their comfort, warmth, and ease of mouth opening by use of a visual analogue scale (VAS). A phase-2 trial examined the safety, suitable dose regimen, and efficacy in 12 patients. Maximal mouth opening was measured, and muscle pain and massage were evaluated subjectively.


The robot was safe in the phase-1 trial, except for two massages in which the pressure was excessive. Massages at 6–10 N were given the highest VAS scores. In phase 2, the massage pressure was arbitrary and each muscle was massaged seven times for 1 min, three times every two weeks. After evaluating the efficacy, additional treatments were performed at a greater pressure or for longer. The massage treatment was very effective for most patients.


The massage treatment was safe and effective for most patients when administered at a pressure of 6–10 N seven times for 1 min per muscle every two weeks. The robot may constitute a useful tool for treating TMJ dysfunction associated with myofascial pain.


Massage Myofascial pain Temporomandibular disorder Masseter muscle 


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Copyright information

© Japanese Society for Oral and Maxillofacial Radiology and Springer 2009

Authors and Affiliations

  • Yoshiko Ariji
    • 1
  • Akitoshi Katsumata
    • 2
  • Nobumi Ogi
    • 3
  • Masahiro Izumi
    • 1
  • Shigemitsu Sakuma
    • 4
  • Yukihiro Iida
    • 2
  • Yuichiro Hiraiwa
    • 1
  • Kenichi Kurita
    • 5
  • Chinami Igarashi
    • 6
  • Kaoru Kobayashi
    • 6
  • Hiroyuki Ishii
    • 7
  • Atsuo Takanishi
    • 7
  • Eiichiro Ariji
    • 1
  1. 1.Department of Oral and Maxillofacial RadiologyAichi-Gakuin University School of DentistryNagoyaJapan
  2. 2.Department of Oral RadiologyAsahi University School of DentistryHozumiJapan
  3. 3.Department of Maxillofacial SurgeryAichi-Gakuin University School of DentistryNagoyaJapan
  4. 4.Department of Fixed ProsthodonticsAichi-Gakuin University School of DentistryNagoyaJapan
  5. 5.Department of Oral and Maxillofacial SurgeryAichi-Gakuin University School of DentistryNagoyaJapan
  6. 6.Department of Oral Radiology, School of Dental MedicineTsurumi UniversityYokohamaJapan
  7. 7.Graduate School of Science and EngineeringWaseda UniversityTokyoJapan

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