Marginal adaptation of class II cavities restored with bulk-fill composites

AbstractObjectives ermine the marginal adaptation of bulk-fill composites in class II MO cavities. s rdized class II MO cavities with bevelled enamel margins were prepared in 40 extracted human molars. The teeth were randomly assigned to one of the five experimental groups (n = 8). The teeth were restored with two horizontal increments of composite (4 mm and 2 mm thickness). The experimental groups were (1st/2nd increment): Gr. A – Venus Bulk-Fill/Venus Diamond; Gr. B – Tetric EvoCeram BulkFill/Tetric EvoCeram; Gr. C – Surefil SDR/Ceram-X; Gr. D – SonicFill; Gr. E – Ceram-X/Ceram-X (control). After finishing procedures, impressions were made using a polyvinyl siloxane and epoxy resin replicas were obtained. Thermo-mechanical stressing was carried out 24 h after the restorative procedure. All specimens were submitted to 240,000 occlusal loading and simultaneous 600 thermal cycles in water at 5 °C and 50 °C. After loading, a new set of epoxy resin replicas was obtained. Scanning electron microscopy was carried out at 200× magnification. Results for the marginal adaptation were expressed as percentages of continuity relative to the exposed interface and analyzed by ANOVA and Duncan post hoc test (p < 0.05). s mel, no significant differences were detected before and after thermo-mechanical loading between groups. In dentine, the worst results were observed in Gr. A. sion lying simple layering techniques, bulk-fill materials do not allow better marginal adaptation than a standard composite. al significance class of resin-base composite (bulk-fill) was recently launched on the market. The bulk-fill composites exhibited adequate marginal adaptation and similar to the results of the standard composite.