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자료유형
학술저널
저자정보
저널정보
대한안면통증구강내과학회 Journal of Oral Medicine and Pain 대한구강내과학회지 제28권 제2호
발행연도
2003.6
수록면
249 - 259 (11page)

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This study was performed to investigate the electromyographic(EMG) activity and bite force according to change of bead posture and clenching level. Twenty four male dental students were selected for the study. They were healthy and had no known masticatory problems. To reduce the subjects' fear of dental damage and to deliver the bite force to several teeth on hard biting of the metallic sensory element of the bite force recorder, acrylic full arch wafers were adapted on both of dental arches. Surface EMG electrodes were placed over the right and the left anterior temporalis and the superficial masseter muscles. Subjects were asked to sit upright with relaxed habitual or natural head posture, and to keep their eyes open. The sensory element was located on the molar area and subjects were asked to bite as strong as possible. Measurements of the EMG activity and bite force were simultaneously carried out in the three head postures, natural, 45? upward, and 30? downward, and in the two clenching levels, maximum and 70% EMG activity of maximum voluntary contraction, and in each side of the dental arch, respectively. Data were recorded and processed with SPSS windowsⓡ(ver. 10.0) and the results obtained were as follows:
1. Only height among the parameters related to physical constitution showed significantly positive correlation with the bite force in almost all measurements.
2. There were no significant change of the EMG activity in both of the masticatory muscles, and also no change of the difference of EMG activity between the two masticatory muscles of same side according to change of head posture.
3. The bite force in both of the clenching levels did not show any significant difference according to head posture.
4. In general, the EMG activity of the anterior temporalis muscle was more correlated with the bite force than that of the masseter muscle. However, the correlation between the bite force and the EMG activity of the anterior temporalis allowed differentiation by clenching level: the bite farce on maximum clenching was correlated with the EMG activity in 45? upward head posture, whereas the bite force on 70% EMG activity of maximum clenching was correlated with the EMG activity in natural, and in 30? downward head posture, respectively.

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2. 연구대상 및 방법

3. 연구결과

4. 총괄 및 고찰

5. 결론

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