Method: Two computational models of an upper central tooth, were designed using mathematical simulation software ANSYS ® 14.0. A 2D axisymmetric model to simulate the diffusion of hypochlorite ion representing dentin endodontically treated. In addition, a mechanical 3D model, restored with fiber-glass post and core in composite resin. In this model was applied a load 100 N and assigned to each zone of dentine different elastic modulus calculated from Mixing Rule equation.
Result: We have found the maximum hypochlorite concentration (5%) close to dentin root canal, followed by the average dentin (2-3%) and outer dentin (0-1%). According to the mechanical model , maximum stress (4.1232 x 107 Pa) were located in the cervical third of dentin (ferrule) and the stump of the model, with a pattern of concentric irregular distribution respectively . Less stress (3,207 x 107 Pa) were located in the dentin-resin cement-post level and third cervical root medium with irregular interface. The minimal stress (4,0749 Pa) occurred in the apical third of the tooth.
Conclusion: Under the conditions and limitations of the study, designed mechanobiological models have reproduced the behavior of dentinal tissue treated endodontically and restored with glass fiber-post, proposing increased dentinal elastic modulus as a result of treatment with hypochlorite at 5% and the stress in ferrule zone.