Fem analysis to evaluate the stresses induced by two different fiber reinforced composite bridges

Aim: The purpose of this study was to examine and compare the stress distribution on simulated anterior FPD models by using a fiber reinforced composite framework, modified with 2 types of fibers – polyethylene and glass fiber reinforced – and of standardized thickness. Materials and Methods: A three-unit FPD replacing the maxillary lateral incisor was constructed using finite element analysis software. A fiber framework of the pontic was designed with three variations: with the main framework curved labially (FRC1), located in the center (FRC2), or curved lingually (FRC3). Each framework was compared with a hybrid composite FPD without any fiber reinforcement. A lateral load was applied to the three different loading points of the pontic 0mm, 3mm, and 6mm from the incisal edge, each representing loading conditions 1, 2, and 3, respectively. Stress analysis was by using two dimensional finite element method. Results: Maximum principle stresses developed in both the crown as well as the dentin of glass fiber reinforced composite anterior FPD was seen to be lesser than that developed in the same of polyethylene reinforced composite anterior FPD for all three loading conditions. Conclusion: Tensile stresses in the crown of glass fiber reinforced composite is less than that observed in the crown of polyethylene reinforced composite. Hence glass reinforced composite has more strength against masticatory forces.