측두하악장애 환자의 교근 및 전측두근의 근전도학적 연구
An Electromyographic Study of the Masseter and Anterior Temporal Muscles in Patients with Temporomandibular Joint Dysfucntion
최현주, 정재헌,
소속 상세정보
최현주 ( Choi Hyun-Joo ) - 조선대학교 치과대학 보철학교실
정재헌 ( Chung Chae-Heon ) - 조선대학교 치과대학 치과보철학교실
KMID : 0353319890130010127
Abstract
The purpose of this study was to investigate the muscle activity related to changes in occlusal jaw relationship in patients with TMJ dysfunction and in normal subjects.
Thirty patients, 20 women and 10 men, in the age range of 17 to 48 years with a mean of 32.6 years, with TMJ dysfunction and twelve normal subjects, 4 women and 8 men, in the age range of 22 to 25 years with a mean of 23.8 years, without any symptoms of TMJ dysfunction and occlusal problems, were selected for this study.
The Bioelectric Processor EM2 (Myotronic Res., Inc., U. S. A. ) with the surface electrodes was used to record the muscular activity quantitatively. Bilateral EMG recordings of the masseter and anterior temporal muscles were obtained during the mandibular rest position and the maximal clench in the intercuspal position (I. C. P), the protrusive position, and the right & left lateral excursive-position.
The results. were as follows :
1. In the mandibular rest position, mean voltages of the masseter and temporalis anterior in TMJ dysfunction patients were higher than those in normal subjects.
2. During the maximal clench in the I. C. P. , the protrusive position, and the right & left lateral excursive-position, mean voltages of the masseter and temporalis anterior in TMJ dysfunction patients were lower than those in normal subjects.
3. In the mandibular rest position, and the maximal clench in the protrusive position and the right & left lateral excursive-position, mean voltages of the right & left masseter and temporalis anterior were symmetrical in both TMJ dysfunction patients and normal subjects.
4. In the normal subjects, mean voltages of working masseter and anterior temporalis were higher than those of balancing masseter and temporalis anterior in the lateral excursive position, but in the TMJ dysfunction pateints, mean voltages of working masseter was not significantly higher than those of balancing masseter in the lateral excursive position.
5. In the TMJ dysfunction patients, no significant differences were founded in the mean voltages of the masseter and temporalis anterior both in the affected side and in the unaffected side.
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