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• W2560414373 abstract "Soft tissues of the temporomandibular joint (TMJ) influence the position and the movement of the condyles. The examination of the laxity of the TMJ provides valuable diagnostic findings concerning the function and pathological changes in the soft tissues of the TMJ. There have, however, been few studies of biomechanical properties of the soft tissues of the TMJ. The purpose of this study was to non-invasively estimate the mechanical properties of the TMJ regions. The viscoelastic properties of the TMJ regions were analyzed by an automatic system which was composed of a measuring device for the mechanical mobility of the TMJ regions and a data analysis unit with a micro-computer. First, the soft tissues of the TMJ at rest position were randomly vibrated through the lower central incisor by a portable vibrator with a small impedance head. During this measurement, a standardized preload 0.49N (50gf) was applied to the tooth. The impedance head generated the output signals which were proportional to input acceleration and force response. They were amplified by charge amplifiers and sampled by an A/D converter inserted in the micro-computer. The mechanical mobility spectrum which gave information about viscoelasticity of the lower tooth and the TMJ regions was obtained. Next, the subjects were instructed to bite resin blocks, and the mobility spectrum which gave the viscoelasticity of the lower tooth was obtained. Then we abtained the mechanical mobility of the TMJ regions by subtracting the second data from the first data. We proposed a mechanical model of the TMJ regions. Furthermore, biomechanical parameters (damper: c, spring: k and mass: m) were analyzed from curve fitting using a personal computer. The viscoelastic parameters for the TMJ regions at rest position were taken of 28 normal subjects (14 men and 14 women). Statistical testing of the data employed a test for the difference of means and correlation coefficient. In normal subjects, the mechanical properties in men were significantly greater than those in women (p<0.05). We applied this system to temporomandibular disorder (TMD) patients (2 men and 2 women). Difference was found for three parameters between normal subjects and TMD patients. The mechanical properties of the TMD patients were out of the range of those of normal subjects. The coefficient of variation in the mechanical properties of TMD patients varied more than those in normal subjects both over one day and over one week. In the next stage of our resarch, we improved this system in order to be able to measure parameters by using chin vibration. During measurement, the preload on the chin was kept at 1.96N (200gf). Parameters of the TMJ regions were taken for 24 normal subjects (12 men and 12 women). The mechanical properties in men were significantly greater than those in women (p<0.01). Our method enabled us to estimate the viscoelastic parameters of the TMJ regions noninvasively." @default.
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• W2560414373 date "1994-01-01" @default.
• W2560414373 modified "2023-09-30" @default.
• W2560414373 title "MEASURING SYSTEM FOR BIOMECHANICAL PROPERTIES OF TEMPOROMANDIBULAR JOINT REGIONS" @default.
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• W2560414373 doi "https://doi.org/10.3951/biomechanisms.12.39" @default.
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