Abstract
Endodontical treatment with a fiber post and composite resin (CR) has a risk of fracture, which should be reduced by a technical improvement. In the current study, finite element (FE) analysis was carried out for a premolar restored with a fiber post and CR to evaluate the risk of fracture. The model has a half symmetrical shape and its components are assumed to be isotropic linear elastic materials. A load of 50 N was applied obliquely to the top surface of the crown. We examined bonded and unbonded conditions between the top surface of dentin and the facing surfaces of crown and composite resin. Results from the FE analysis showed that only the unbonded condition caused a large deformation of the CR and a large concentration of von Mises stress, i.e., 126 MPa, at a corner of the CR. They indicate that a crack may be generated at this point of stress concentration and may be propagated in the CR to fracture the restored tooth.
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