Berlin 2008 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 44: Bioinspired Materials
MM 44.2: Vortrag
Donnerstag, 28. Februar 2008, 14:15–14:30, H 0111
Mechanical implications of the inhomogeneity of bone material — •Carolin Lukas1,2, Davide Ruffoni1, Peter Fratzl1, Paul Roschger3, Klaus Klaushofer3, and Richard Weinkamer1 — 1Max Planck Institute of Colloids and Interfaces, Department of Biomaterials, Potsdam, Germany — 2TU Berlin, Germany — 3Ludwig Boltzmann Institute of Osteology, Vienna, Austria
The mechanical behaviour of bone at the material level is determined by the amount and the distribution of mineral. Bone mineral is heterogeneously distributed because of the continuous remodeling of bone and the consecutive mineralization process. During bone mineralization each newly deposited bone packet increases its stiffness by increasing its mineral content. Differences in mineral content are experimentally accessible and are characterized by a frequency distribution of the mineral content called the bone mineralization density distribution (BMDD). A mathematical framework was developed to predict how different remodeling rates result in different BMDDs. The mechanical implications of such mineralization distributions are here investigated. First, combining measurement of mineral content with micromechanical tests, the BMDD is converted into a distribution of elastic moduli. Secondly, assuming an ideal geometrical arrangement of the bone packets inside the trabeculae the bounds for the elastic properties are established for the different material distributions. Considering then more realistic 3D arrangements of the bone packets, the mechanical implications of the different types of BMDD are computed at the trabecular level.