Biomechanical behavior of maxilar canines trengthened with different root retainers

Objectives: this study evaluated the distribution of the tensions in maxilar canines (CS) strengthened with casting post, glass fibre posts or carbon fibre posts. Methods: the construction of CS endodontically treated models was carried, strengthened with casting post, fibre glass post and carbon post, both reconstructed with ceramics crown, in the Program Auto 2000. These models had been transferred to the Finite Elements Program (Ansys 8.0), where the properties of the materials (Young's modulus and Poisson's ratio) were determined, were meshed with an equilateral triangles mesh and carried through restrictions and applied 250N of mastigatory load at 45° in the palatal surface of CS. Later, the results were ploted and the same ones were analyzed. Results: the results suggest better distribution of the mastigatory load in the carbon fibre post, glass fibre post and cating post, respectly. Conclusions: it was concluded that the carbon fibre post presented a better biomechanical behavior because it presents Young's modulus (elasticity) similar to the dentine, thus decraesing, the risks of dental breakings.