## 3 Results  
The results of the stress accumulation analysis in different layers, including in the enamel, dentin, restoration, and resin cement applied in different thicknesses, are presented in Figure 5. The maximum principal stress (Pmax; MPa) values were utilized for this analysis. The findings reveal that the highest stress accumulation was observed in the enamel layer, followed by the restoration layer, the dentin layer, and the resin cement layer. The results of the stress accumulation analysis are presented in Figure 6, where the maximum principal stress values (Pmax; MPa) are shown for the enamel, dentin, restoration, and the varying thicknesses of the resin cement (V1; Poisson's ratio: 0.35). The resin cement had an elastic modulus of 8.3 GPa and a Poisson's ratio of V1: 0.35. The enamel had the highest stress value (Pmax: 90.23 MPa) when the resin cement with a thickness of 150 \(\upmu\)m was used, and the lowest stress accumulation (Pmax: 89.13 MPa) was observed when the resin cement with a thickness of 50 \(\upmu\)m was used. In the dentin, the highest stress accumulation (Pmax: 38.52 MPa) was found when the resin cement with a thickness of 150 \(\upmu\)m was used, while the lowest stress accumulation (Pmax: 38.36 MPa) was observed when the resin cement with a thickness of 50 \(\upmu\)m was used. The restoration had the highest amount of stress accumulation when the resin cement with a thickness of 100 \(\upmu\)m was used (Pmax: 52.68 MPa), while the lowest amount of stress accumulation was found when the resin cement with a thickness of 150 \(\upmu\)m was used (Pmax: 42.22 MPa). The highest amount of stress accumulation in the resin cement was observed when it was used with a thickness of 150 \(\upmu\)m (Pmax: 1.33 MPa), and the lowest amount of stress accumulation was found when the resin cement with a thickness of 100 \(\upmu\)m was used (Pmax: 0.99 MPa). Figure 5: Maximum principal stress (MPa) distribution within the enamel, dentin, restoration, and different thicknesses of resin cement in each group under 600 N of total force applied to the occlusal surface. The maximum principal stress distribution in the enamel, dentin, restoration, and the different thicknesses of the resin cement (V2: Poisson's ratio: 0.24) is shown in Figure 7. In the resin cement with an elastic modulus of 8.3 Gpa and V2, the highest amount of stress in the enamel (Pmax: 90.12 MPa) was found when the resin cement had a thickness of 150. In contrast, the lowest amount of stress (Pmax: 89.09 MPa) occurred when the resin cement had a thickness of 50. In the dentin, the highest amount of stress (Pmax: 38.69 MPa) was found when the resin cement with a thickness of 150 was used, while the lowest amount of stress in the dentin (Pmax: 38.43 MPa) was found when the resin cement with a thickness of 50 was used. The highest amount of stress accumulation in the restoration was found when the resin cement with a thickness of 100 was used, while the lowest amount of stress accumulation was found when the resin cement with a thickness of 150 was used. In the resin cement, the highest amount of stress accumulation was found when the resin cement with a thickness of 150 was used (Pmax: 1.24 MPa), and the lowest amount of stress accumulation was found when the resin cement had a thickness of 100 (Pmax: 1.01 MPa). When an elastic modulus of 8.3 GPa with a Poisson's ratio of V1 and an elastic modulus of 8.3 GPa with a Poisson's ratio of V2 were used, the stress on both the enamel and dentin increased with an increase in the cement thickness, while the accumulation of stress in the restoration decreased. The highest stress value for the enamel and dentin was observed at the 150 recent theoretical thickness for both V1 and V2, whereas the lowest stress value was observed at the 50 recent theoretical thickness. The amount of stress in the enamel and dentin increased as the cement thickness increased in both resin cements.