Physical Model- Constitutive Properties of Tissues The tissues to be considered in the model are enamel, dentin, periodontal ligament, pulp and bone. This last tissue can be classified in two categories: cortical and cancellous. According to Anusavice (1998) most material properties of human teeth have been measured, but their values vary from author to author. Enamel and Dentin ď Ž Enamel is formed by parallel prisms of hydroxyapatite, oriented with its axis normal to the surface of dentin. As a consequence, it exhibits an orthotropic fragile mechanical behavior. ď Ž
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Dentin microstructure consists of tubules connected by organic material, provoking anisotropy, as the organic material connecting the fibers is less resistant than the hydroxyapatite. Both tissues exhibit fragile behavior under tensile stress, especially enamel.
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