Mechanical Properties of Different Dentin Replacement Materials: A Comparative Study of Biaxial Flexural Strength and Microhardness

Aim: Endodontically treated teeth (ETT) require restorative materials that can effectively replace lost dentin and withstand occlusal forces. This study aimed to compare the biaxial flexural strength (BFS) and Vickers microhardness (VHN) of four different dentin replacement materials: a high-viscosity resin-modified glass ionomer cement (RIVA light cure HV), a bulk-fill flowable composite resin (SDR flow+), a flowable short fiber-reinforced composite (everX Flow), and a short fiber-reinforced composite (everX Posterior). Material and Method: A total of 96 disk-shaped samples were prepared, 24 from each material. Half of the samples were subjected to BFS testing (n=12), while the remaining samples were subjected to microhardness testing (n=12). Statistical analysis was performed using one-way ANOVA and Welch’s ANOVA. Results: everX Flow showed the highest BFS (169.95 ± 10.3 MPa), followed by everX Posterior (141.42 ± 5.41 MPa), SDR flow+ (135.17 ± 4.17 MPa), and RIVA light cure HV (35.13 ± 6.14 MPa). While there was no significant difference between the BFS values of the everX Posterior and SDR flow+ groups (p>0.05), there was a difference among the BFS values of the other groups (p