An Electromyographic Study of the Efficacy of Mandibular Movement Esercise on Opening Limitation

개구제한시 하악운동연습의 효과에 관한 근전도학적 연구

  • Chang-Kwon Song (Dept. of Oral Diagnosis and Oral Medicine, School of Dentistry, Wonkwang University) ;
  • Kyung-Soo Han (Dept. of Oral Diagnosis and Oral Medicine, School of Dentistry, Wonkwang Universit) ;
  • Ho-In Jung (Dept. of Oral Diagnosis and Oral Medicine, School of Dentistry, Wonkwang University)
  • Published : 1992.06.01

Abstract

52 Dental students without masticatory problems were selected for this study. They were trained on several mandibular position and mandibular movement exercise, that is, rest position, light bite, tapping, hinge opening, habitual opening, opening limitation, stretch exercise, resistance exercise and clenching. The objectives of this study was to investigate the effects of mandibular movement exercise, especially stretch and resistance, on the experimentally guided limited mouth opening. Muscle activity of the anterior temporalis and the masseter on above mentioned position or exercise were recorded with bioelectric processor EM2(Myotronics, U.S.A.) and the data were processed with SPSS. The obtained results were as follows : 1. Activity of the muscles at rest position were decreased with mandibular movement exercise. 2. Forceful mouth opening on opening limitation increased muscle activity greatly, especially of the masseter. 3. On opening limitation, stretch or resistance exercise was very efficient for decrease of muscle activities. 4. There were no difference of muscle activity between on hinge opening and on habitual opening. Therefore, for muscle relaxation, the two movement exercise can be used interchangeably.

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