Physical Properties of a New Fiber-reinforced Composite

Methods: The materials examined in this study were everX Posterior (EXP, GC), SureFil SDR flow (SDR, Densply), Filtek Bulk Fill Flowable Restorative (FBF, 3M ESPE). The specimens (n=5) for the compressive strength were made using a metal mold of 4mm diameter by 6mm thick. The compressive strength test was performed with a universal testing machine (AG-50kNG, Shimadzu Corp., Japan) at 1mm/min crosshead speed according to ISO 9917-2007. The specimens (n=5) for fracture toughness were prepared using a single edge-notched metal mold (length 25, width 5.0, thickness 2.5 and notch length 2.5 in mm). The test was carried out at 0.2mm/min crosshead speed. Fracture toughness values were calculated from maximum fracture load using ASTM E399-1983 standard method. Materials were cured with LED Light (G-Light Prima, GC) and stored in distilled water of 37 degrees Celsius for 24 hours until test. The data was analyzed by one-way ANOVA (p<0.01). 

Results: Mean values (standard deviation) of physical properties are shown below. EXP showed the significantly highest compressive strength and fracture toughness.

Same superscript means no significant different

Conclusion: These results suggested that EXP has the capacity of withstanding higher biting forces than bulk-fill composites.