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On the basis of the investigation of fresh bone in Part I, results are presented that show the influence of ageing, location and direction on the characteristics of the mandible. A comparison with the results of the earlier report, reveals the extent of degradation. The test results of 56 specimens of the left halves of the mandibles L 01, 02 and 03 indicate a so-called self-splint effect within the bony cross-section in the vicinity of structure possibly diseased or attenuated areas. Investigation of the "in-vivo" behavior of the compact bone was performed on the thigh bone of a freshly slaughtered cow. The influence of the loading velocity on Young's modulus was evaluated, and revealed an elastic and a viscid component, and that an asymptotic limit applies. It was also shown that the loading velocity of 0.2 mm/min, which was used for the tests, provides values very close to the asymptotic limit. Changes in condition, associated with progressive demineralisation and drying out of the bone tissue during the preparation of the specimens have an influence on Young's modulus. Specimens were tested under dry and wet conditions, and a variation of 20% caused by moisture was found. In general, the stiffness of dry specimens is higher than that of specimens in a physiological condition.

biomedizinische technik

Mechanische Kennwerte des Human-Unterkiefers und Untersuchung zum »in-vivo«-Verhalten des kompakten Knochengewebes, ein Beitrag zur Darstellung der Biomechanik des Unterkiefers — Teil II - Mechanical Characteristics of the Human Mandible, and Investigation of the »in-vivo« Reaction of the Compact Bone: a Contribution to the Description of the Biomechanics of the Mandible — Part II