Fracture toughness of fiber-reinforced composites
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OBJECTIVES: Fiber-reinforced composite has been commercialized as universal and flowable resin based composite. The objective of this study is to test and compare fracture toughness of fiber-reinforced composite resins to conventional particulate filler composite resins. MATERIALS AND METHODS: Four products were tested in this study, including: GC everX Posterior (EXP), 3M ESPE Filtek Supreme Ultra Universal (FSU), 3M ESPE Filtek Supreme Ultra Flowable (FSF), Nanova Biomaterials NovaPro Flowable (NPF), Nanova Biomaterials NovaPro Universal (NPU), Prime Dental Manufacturing Prime dent flowable (PDF). NovaPro contains hydroxyapatite nanofiber as filler and everX has glass fiber as filler. Materials were tested by creating specimens in two configurations using metallic molds (n=5 or 10/group). Flexural toughness specimens were rectangles 2.5×5×25mm with a slot and Vnotch of 1x2.4mm with at the central edge. All specimens were made following manufacturer’s instructions under 1,470mW/cm2 light curing. After setting and demolding, specimens were kept in 37oC water for 72 hours. Testing was performed on an Instron machine (Model 5566A) with a three-point bending fixture at a crosshead speed of 0.25 mm/sec and Vnotch faced to tensile side. Oneway ANOVA post hoc Tukey HST (JMP Pro 12.0.) was used for data analysis (significance level = 0.05). RESULTS: Fracture toughness results are shown in Table 1. There was significant difference among groups. CONCLUSIONS: Composites with fiber fillers showed significant higher fracture toughness.