Effect of Glass Fiber Incorporation on Flexural Properties of Experimental Composites

This study evaluated the effect of fiber addiction in flexural properties of 30 wt% silica filled BisGMA resin (FR) or unfilled Bis-GMA (UR). Ten groups were created ( N = 10 ) varying the resin (FR or UR) and quantity of glass fibers (wt%: 0, 10, 15, 20, and 30). Samples (10 × 2 × 1 mm) were submitted to flexural strength test following SEM examination. Data were analyzed by two-way ANOVA, Tukey, and Student t -test ( α = 0.05 ). Results for flexural strength (MPa) were FR-groups: 0% ( 442.7 ± 140.6 ) C , 10% ( 772.8 ± 446.3 ) ABC , 15% ( 854.7 ± 297.3 ) AB , 20% ( 863.4 ± 418.0 ) A , 30% ( 459.5 ± 140.5 ) BC ; UR-groups: 0% ( 187.7 ± 120.3 ) B , 10% ( 795.4 ± 688.1 ) B , 15% ( 1999.9 ± 1258.6 ) A , 20% ( 1911.5 ± 596.8 ) A , and 30% ( 2090.6 ± 656.7 ) A , and for flexural modulus (GPa) FR-groups: 0% ( 2065.63 ± 882.15 ) B , 10% ( 4479.06 ± 3019.82 ) AB , 15% ( 5694.89 ± 2790.3 ) A , 20% ( 6042.11 ± 3392.13 ) A , and 30% ( 2495.67 ± 1345.86 ) B ; UR-groups: 0% ( 1090.08 ± 708.81 ) C , 10% ( 7032.13 ± 7864.53 ) BC , 15% ( 19331.57 ± 16759.12 ) AB , 20% ( 15726.03 ± 8035.09 ) AB , and 30% ( 29364.37 ± 13928.96 ) A . Fiber addiction in BisGMA resin increases flexural properties, and the interaction between resin and fibers seems better in the absence of inorganic fillers increasing flexural properties.