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Reliability of Muscle Evaluation with a Tactile Sensor System  

Oh, Young-Rak (Department of Oral Medicine, College of Dentistry, Dankook University)
Lee, Dong-Ju (Department of Oral Medicine, College of Dentistry, Dankook University)
Kim, Sung-Hwan (Department of Oral Medicine, College of Dentistry, Dankook University)
Kim, Mee-Eun (Department of Oral Medicine, College of Dentistry, Dankook University)
Kim, Ki-Suk (Department of Oral Medicine, College of Dentistry, Dankook University)
Publication Information
Journal of Oral Medicine and Pain / v.30, no.3, 2005 , pp. 337-344 More about this Journal
Abstract
A tactile sensor employs a piezoelectric element to detect contact frequency shifts and thereby measure the stiffness or softness of material such as tissue, which allows the sensor to be used in many fields of research for urology, cardiology, gynecology, sports medicine and caner detection and especially for cosmetics and skin care. In this study, reliability of the tactile sensor system was investigated with its manual application to the muscles susceptible to temporomandibular disorders. Stiffness and elasticity of anterior temporalis, masseter and trapezius muscles were calibrated bilaterally from 5 healthy men with an average of 24.5$\pm$0.94 years. The tactile sensor used in this study had a computer-controlled and motor-driven sensor unit which automatically pressed down on the skin surface over the muscles being measured and retracted, thereby providing the hysteresis curve. The slope of the tangent of the hysteresis curve (${\Delta}f/{\Delta}x$) is defined as stiffness of the muscle being measured and the distance between the two parts of the curve as its elasticity. To determine inter-examiner reliability, all the measurements were performed by the two examiners A and B, respectively and the same examination were repeated with an interval of 2 days for intra-examiner reliability. The results from this study demonstrated high reliability in measuring stiffness and elasticity of anterior temporalis, masseter and upper trapezius muscles using a tactile sensor system. It is suggested that the tactile sensor system can be a highly reproducible and effective instrument for quantitative evaluation of the muscle in head and neck region.
Keywords
Tactile sensor; Muscle; Stiffness; Elasticity;
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