Effects of Masseter and Cervical Muscle Activity in Temporomandibular Joint Disorder

저작근 및 경부근 긴장도가 측두하악장애에 미치는 영향

  • Jung, Jae-Young (Dept. of Oriental Rehabilitation Medicine, College of Oriental Medicine, Kyung-Hee University) ;
  • Kim, Sung-Su (Dept. of Oriental Rehabilitation Medicine, College of Oriental Medicine, Kyung-Hee University)
  • 정재영 (경희대학교 한의과대학 한방재활의학과교실) ;
  • 김성수 (경희대학교 한의과대학 한방재활의학과교실)
  • Received : 2010.06.15
  • Accepted : 2010.07.14
  • Published : 2010.07.30


Objectives : The purpose of this study was to investigate the relationship between masseter and cervical muscle activity and temporomandibular disorder in female office workers. Methods : Experimental group of 24 healthy subjects complained of temporomandibular joint related to computer use which lasted more than 3 months in the past year and was present in the past 7 days as well as on the day of test. Control group of 20 healthy subjects had no complaints of minimal discomfort on the day of test, and had no discomfort in the past 7 days. If they had reported discomfort in the past 12 months, it was of a short duration(<3 months) and resolved at least 3 months prior to participation. Outcomes were assessed by meridian-electromyography(MEMG), whole spin x-ray, mandibular function impairment questionnaire(MFIQ), neck disability index(NDI), visual analog scale(VAS), Beck depression inventory(BDI), stress reaction inventory(SRI) and Holmes & Rahe social readjustment rating scale(SRRS). Results : The contraction power of masseter muscle, upper trapezius, sternocleido-mastoid muscle and erector spinae by MEMG was significantly higher in the experimental group. The muscle fatigue of masseter muscle and sternodeido-mastoid muscle by MEMG was significantly higher in the experimental group. SRI was significantly higher in experimental group. There was no significant difference between two groups in the Jackson's angle, Cobb's method and cranio-cervical posture. Conclusions : The results suggest that temporomandibular disorder related mental stress but physical stress does not change cervical structure significantly.


Temporomandibular joint disorder;Meridian-electromyograph;Cranio-cervical posture;Stress


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