Relation between electrical stimulus intensity, masseteric exteroceptive reflex and sensory perception
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概要
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Purpose: The purpose of this study was to characterize the relation between stimulus intensity, masseteric exteroceptive suppression (ES), and sensory perception as a possible quantitative or qualitative tool in the diagnosis of the masticatory system for prosthodontic treatment.<BR>Methods: From 12 males and 12 females (22-41 years), surface EMG was recorded from the left masseter muscle. Visual feedback allowed the subjects to maintain a constant clenching level of 30% maximal voluntary contraction. Thirteen fixed stimulus intensities from 5 to 35 mA in 2.5 mA increments were applied at random. A computer program calculated the duration of ES, based on the 50% level of the mean pre-stimulus EMG. The stimulation intensity at which early (ES1) or late (ES2) exteroceptive suppressions appeared first and at which subjects answered as being painful were defined as the reflex threshold (RT1 or RT2) and pain threshold (PT), respectively. The relation between sensory perception and ES was evaluated using stimulus-response (S-R) curve analysis.<BR>Results: Significant differences were found between PTand RT1, and between RT1 and RT2 (P < 0.001). After S-R curve analysis, the maximum duration of ES1 and ES2 was estimated at 9.6 ms and 33.5 ms, and appearance was rated as 6.2 and 4.0 on numeric rating scale (NRS), saturation was 7.6 and 6.9, and slope was 7.0 and 11.2, respectively.<BR>Conclusions: All parameters for changes in ES following increasing incremental stimulus intensity could be analyzed. The construction of S-R curves in relation to sensory perception and ES parameters characterized the difference between ES1 and ES2.
- 社団法人 日本補綴歯科学会の論文
著者
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Arendt-nielsen Lars
Center For Sensory-motor Interaction Department Of Health Science And Technology Aalborg University
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Wang Kelun
Center For Health Promotion School Of Public Health Beijing Medical University
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Komiyama Osamu
Department Of Clinical Oral Physiology Nihon University School Of Dentistry At Matsudo
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Svensson Peter
Department Of Applied Acoustics Chalmers University Of Technology
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De Laat
Department Of Oral And Maxillofacial Surgery School Of Dentistry Oral Pathology And Maxillo-facial S
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Kawara Misao
Department Of Clinical Oral Physiology Nihon University School Of Dentistry At Matsudo
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SVENSSON Peter
Department of Clinical Oral Physiology, School of Dentistry, University of Aarhus
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Uchida Takashi
Department of Clinical Pharmaceutical Sciences, School of Pharmaceutical Sciences, Kumamoto University
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