Damage and Fatigue Failure of Conventional and Bulk-Filled Resin Composites

Objectives: Resin-based composites are the most widely used dental restorative materials. Bulk-fill resin of rising interest as they can be clinically applied in thicker increments compared to conventional composites. The purpose study was evaluate flexural fatigue strength a and bulk-filled composite placed incrementally or non-incrementally. Methods: Resin specimens were fabricated using either (Brilliant EverGlow?) bulk-fill (Fill-Up!TM) by non-incremental filling (2 × 2 25 mm3) (1 mm3). Specimens stored distilled water for 24 h thermocycled 5000 cycles. static (σ), limit (FFL) after 105 cycles post-fatigue (PFσ) measured. Data analyzed ANOVA, with post-hoc Tukey’s test compare mean FFL (p σ PFσ regardless incremental cure thermocycling but not There no significant difference storage, increase < 0.05). Conclusions: type rather than placement had greater effect on strength, suggesting that operator technique less influence material selection. Thermocycling combination cyclic loading caused strengthening composites, likely due absorption dissipation stresses, thereby enhancing resistance fracture.