The effect of Glass - Fiber on flexural strength of composite resins

The aim of this study was to evaluate the effect of glass-fiber on the flexural strength of composite resins. Methods & Materials: The study was done experimentally in which flexural strength of glass - fiber reinforced composite resins were assessed with a three-point load test on 22 samples. 11 samples of composite resin blocks and 11 samples of composite resins reinforced with glass – fiber were prepared in a mold of 25×6×2 mm and stored in 100% of moisture for one month, until they were ready for testing in an Instron Universal Testing Machine using a crosshead speed of 1 mm/min. Student t test was used for statistical analysis. Flexural strength in the first group was 22.39±3.38 MPa and in second group was 29.74±2.36 MPa. According to t test analysis, the difference between the two groups was statistically significant. (P<0.01) The results of this study suggest that the flexural strength of the fiber-reinforced composite made from glass - fibers was more than composite resin.