Mechanical Stability of Self-Adhesive/Ion-Releasing Resin Composites

The purpose of this study was to assess the effects water storage on surface microhardness (VHN) and fracture toughness (K1C) two self-adhesive restorative materials compared traditional resin composite resin-modified glass ionomer cement (RMGIC) materials. Methods: Two (Activa Vertise Flow), a nonflowable (Filtek Z250), an RMGIC (Fuji II) were evaluated. Hardness measurements (n = 12) recorded at three time intervals: (i) one-hour post-irradiation; (ii) after one day in 37 °C; (iii) 90 days °C. Fracture conducted °C ANOVA Tukey post hoc tests used for statistical analysis. Results: Baseline VHN data 38.2–58.3, decreasing significantly 28.8–55.6 following storage. Filtek Z250 had highest before storage, while Activa lowest. KIC values varied between 0.98–1.32 MPa·m0.5. value Fuji II showed lowest (after both 1 water). However, decreased except II. Conclusion: Self-adhesive/ion-releasing composites negatively affected by Material reinforcements are possible future areas explore.