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The Frictional Coefficient of the Temporomandibular Joint and Its Dependency on the Magnitude and Duration of Joint Loading

Department of Orthodontics and Craniofacial Developmental Biology and
³ Department of Oral Maxillofacial Pathobiology, Hiroshima University Graduate School of Biomedical Sciences, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan;
¹ Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, Osaka, Japan; and
² Department of Functional Anatomy, ACTA, Amsterdam, The Netherlands; Hiroshima University Graduate School of Biomedical Sciences, Hiroshima, Japan;

View larger version (25K): [in a new window]   Figure 1. Schematic illustration of the pendulum-type friction tester and a sample of damping curve recorded by the three-dimensional dynamic angle-sensor. The total compressive load was 50 N or 80 N, and the initial swing was approximately 5°, which was commenced immediately after the load was set. By the three-dimensional dynamic angle-sensor, three angular velocities and three angles are measured round three axes, i.e., a roll, a pitch, and a yaw axis. From the total six measurements obtained, the three-dimensional movements of the condyle along the articular surface were calculated.

View larger version (17K): [in a new window]   Figure 2. Means and standard deviations of the frictional coefficients for the TMJ after 5 sec, 5 min, 10 min, 20 min, 40 min, and 1 hr of stationary loading duration, with 50 N and 80 N compressive loadings. Error bars are standard deviations (for each group, n = 10). *Significance of difference between the values (p < 0.01) as tested with Scheffé’s test. p < 0.0001 compared with the frictional coefficient at 5 min, 10 min, 20 min, 40 min, and 1 hr. White bars = 50 N; black bars = 80 N.