Composite is the most esthetic direct tooth-colored restorative material. Improvement in resin-based composite technology has increased the acceptance of this material among dental professionals particularly for posterior teeth. Composite should be strong enough to prevent bulk fracture. In this study, we compared fracture resistance of bulk-fill composites with flowable liner underneath bulk-fill.
Materials and methods: In this in vitro study, 20 teeth were divided into 2 groups of 10 each. Ideal class II cavities were done, Group A was restored with bulk-fill, and Group B was restored with flowable composite underneath bulk-fill. Fracture resistance of the teeth was measured by a Universal Testing Machine.
Results: There was a significant difference (p = 0.05) in fracture resistance between the two groups. The mean value of Group A was 0.4870 kN and Group B was 0.6110 kN.
Conclusion: Within the limitation of the study, it is concluded that flowable composite underneath bulk-fill improves the fracture resistance of the teeth when compared to only bulk-fill.
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