Comparative evaluation of stress distribution in maxillary premolar restored with onlay fabricated with different restorative materials – A three-dimensional finite element analysis study
Geetika Pable, Suparna Saha, Mainak Kanti Saha, Rolly Agarwal, Shakti Singh Meena, Garima Poddar
Abstract
Aim: The aim of this study was to evaluate stress distribution in maxillary premolar onlay fabricated of four different restorations. Methodology: A three-dimensional (3D) maxillary premolar model of onlay was simulated using SolidWorks software. The fabricated 3D onlay model was then restored using four different restorative materials, namely fiber-reinforced direct composite, indirect composite, pressable ceramic, and zirconia using the parameters of Young's modulus and Poisson's ratio. The models were subjected to an axial load of 200 N. Von Mises stresses and strains were calculated. The highest stresses and strains generated in four different restorative materials were observed when subjected to vertical force on the palatal cusp, one on each marginal ridge, and one on the central fossa. Results: Maximum von Mises stresses generated with indirect composite, direct composite, IPS Empress ceramic, and zirconia onlay were 453.83 MPa, 441.36 MPa, 376.82 MPa, and 368.82 MPa, respectively, in the maxillary premolar onlay group. Conclusion: The results concluded that zirconia is a preferred choice of material for complex premolar cavities due to its superior stress distribution, enhancing durability, and protecting tooth structure. Conversely, composites may elevate failure risk under occlusal loads in large cavities.