Aim: The aim of this study was to evaluate the stress distribution pattern and total deformation of ‎an endodontically treated molars with large pulp chambers, restored using a composite resin ‎core with a fiber post (FC Group) and composite resin core with novel zirconia tube (ZT ‎Group)‎ Materials and methods: Finite element analysis was used to simulate occlusal loading on two groups. The ‎models in each group, were subjected to axial load of 200 N. The Von Mises stress values, ‎distributions, and deformations were compared after the analysis. The color scale was ‎utilized to make comparisons between the models that were studied. All deformations were ‎calculated in mm and stress levels were calculated in Mpa.‎ Results: Result shows that maximum tooth deformation are monitored on the Fiber ‎reinforced composite post group -FC (0.00183mm) compared to the Composite resin core ‎with zirconia tube-ZC (0.00154mm) which has lesser deformation.  The von mises stress ‎was higher in FC group (9.75000 Mpa) and lower in ZT group (8.85000 Mpa). When strains ‎were examined, the strain values were less for the ZT group than for the FC group. The ZT ‎group shows a slightly higher stress value than the FC group.‎ Conclusion: The endodontically treated tooth with zirconia tube (ZT) showed less tooth ‎deformation and better stress distribution than the fiber-reinforced composite post (FC).‎