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Journal of the Korean Academy of Rehabilitation Medicine 2007;31(5):568-573.
Pain Evaluation with Surface Electromyography in Temporomandibular Myofascial Pain Dysfunction Syndrome.
Ryu, Su Ra , Jung, Sung Hwan , Kim, Jae Hyung , Jang, In Sub , Choi, In Sung , Lee, Sam Gyu
Department of Physical Medicine and Rehabilitation, Chonnam National University Medical School, Korea. sam91@jnu.ac.kr
측두하악 근막통 기능이상 증후군에서 표면근전도검사를 이용한 통증평가
류수라, 정성환, 김재형, 장인섭, 최인성, 이삼규
전남대학교 의과대학 재활의학교실
To investigate usefulness of surface electromyography (sEMG) for the pain evaluation in the patients with temporomandibular myofascial pain dysfunction syndrome (TM-MPDS).
Twenty unilateral TM-MPDS patients (10 males, 10 females, duration of disease 6.6±5.6 months, age 28.5±3.0 years) and twenty healthy controls (10 males, 10 females, age 30.1±6.2 years) were recruited for this study. The patients were treated with trigger point injection therapy and cryotherapy once a week, and ultrasound thermotherapy four times a week for 2 weeks. Active electrodes were attached on temporalis and masseter muscles with reference electrode on chin and ground electrode on forehead. All of subjects were instructed to clench teeth for 5 seconds after full relaxation. For temporalis and masseter muscles, the amplitudes of clenching-EMG activities were obtained and the mean value of five biting cycles was calculated on both sides. sEMG, visual analog scale (VAS) and asymmetry index (AI) were assessed before and 2 weeks after treatment.
For temporalis and masseter muscles, the amplitudes of affected side-EMG activity significantly decreased, and the AI of the patient group significantly increased compared with those of the control group (p<0.05, p< 0.05). The AI of the patient group significantly decreased after treatment (p<0.05, p<0.05). Higher AI in masseter muscle before treatment was significantly correlated with lower VAS after treatment (r=-0.487, p<0.05).
It is suggested that sEMG would be useful for diagnosing and evaluating the pain in TM-MPDS. (J Korean Acad Rehab Med 2007; 31: 568-573)
Key Words: Electromyography, Temporomandibular joint, Muscle, Dysfunction
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