Dataset- In-vitro Comparison of Fracture Resistance in Post-Core Systems Among Teeth with Different Numbers of Dentin Walls

Introduction: Endodontically treated teeth (ETT) are structurally weakened and more prone to fracture due to loss of tooth structure, especially when one or more coronal walls are missing. Restoring such teeth with fiber post-and-core systems is a common strategy, but the influence of the number and location of remaining dentin walls on fracture resistance remains unclear. Aim: To compare the fracture resistance of a fiber post-and-core system in ETT with varying numbers and locations of remaining dentin walls. Settings and Design: In vitro laboratory experimental study conducted in a dental school research facility. Methods and Material: Fifty extracted human premolars were selected and randomly assigned to five groups (n = 10). All teeth were endodontically treated and restored using a fiber post and composite resin core. The control group preserved all coronal walls, while groups A–D had one wall removed (palatal, buccal, mesial, or distal, respectively). Standardized tooth preparation and post cementation were performed. Statistical analysis used: Data normality was assessed using the Shapiro–Wilk test. Group comparisons were performed using one-way ANOVA (p < 0.05). Results: Mean fracture resistance (±SD) values were by group :268.77 ± 119.00 N (A); 420.44 ± 132.65 N (B); 363.76 ± 102.57 N (C); 374.10 ± 158.62 N (D); 364.07 ± 147.28 N (Control). No statistically significant differences were found among groups (p > 0.05). Conclusions: The presence or absence of a single dentin wall—regardless of its location—did not significantly affect the fracture resistance of ETT restored with fiber post-and-core systems.