Objectives: Post and core applications are generally used in the restoration of endodontically treated teeth. The stress distribution during masticatory function in a tooth restored with post and core can cause root fracture. The different mechanical behavior of post and dentine is a critical parameter for the load transmission. In order to minimize the rigidity difference between the dentine and the post, a new kind of prefabricated post was developed. The aim of the study was to analyze the mechanical behavior of a new polymeric composite post reinforced with glass fibers. A natural tooth was considered as a reference model. Methods: The 3D finite element method (FEM) was selected to perform the stress analysis of the two rooted first maxillary premolar restored with glass fiber posts. Composite resin was used as core material and full porcelain crown covered the model. Four nodded tetrahedral elements were applied in the description of the tooth morphology, resulting in 1 684 512 elements and 246 510 nodes with 739 530 degrees of freedom. A total force of 200 N applied. Results: The greatest stresses were observed in the palatal cervical region (-16.126 MPa) and in the intraradicular parts of the posts (-23.898 MPa). In the cervical region, the mean high-intensity compressive stress areas were more extensive in the natural tooth (-175.222 MPa). Conclusions: The glass fiber composite post induces a stress field similar to that of the natural tooth, except in the cervical region where the natural tooth has higher compressive stresses.

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