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(a) Stress-relaxation as represented by Gr(t) for rabbit periodontal ligament. Each point and bars represent mean ± 1 SD. (b) Typical example of exponential curve fitting. Measured values (open circles) are well expressed by an equation: Gr(t) = 0.09exp (−t/ 0.35) + 0.13exp (−t/ 4.12) + 0.39exp (−t/ 403) + 0.39, reproduced from Komatsu et al. (2007) [62], by permission.
