Efficacy of Bulk Fill Flowable Composite Reinforced with Short Fibers in Fracture Resistance of Restored Extensive Premolars Cavities

Abstract

Objectives: Tooth fractures are a frequent side effect after MOD restorations. This investigation aimed to evaluate the impact of bulk fill flowable composite reinforced with short fibers concerning maxillary premolar teeth's resistance to fracture, All teeth used have extensively restored MOD cavities. Materials and Methods: In this in vitro experimental study, Selecting sixty maxillary sound premolar teeth, they were kept in a chloramine solution. After that, the teeth were set into acrylic blocks. 1mm below the CEJ.The teeth were grouped into four groups of fifteen each at random. Group A, Teeth were intact without any cavity (negative control). Wide MOD cavities were done by cylindrical bur for the 3 other groups. Group B, the teeth with MOD cavities without any restoration (positive control); Group C, the teeth were filled with bulkfill flowable composite Tetric N flow bulk fill (Ivoclar Vivadent); and group D, the teeth were restored with short fibers reinforced bulkfill flowable composite ever X Flow(GC). After storage for 24-hour period in water at 37°C, the teeth's ability to withstand fractures was evaluated by (INSTRON). The load was measured in N at the fracture. Mode of fracture was observed. One-way ANOVA was utilized to analyze the data. Results: The mean fracture strength was 1216 ± 352 N in group A, 330 ± 201 N in group B, 1013 ± 389 N in group C and 1019 ± 164 N in group D. Conclusion: The restoration of extensive MOD cavities using flowable composite with short fiber reinforcement enhanced the teeth's resistance to fracture from compressive forces, with no difference than did the other bulk fill flowable composite.