RESUMO
The aim of this study was to measure and compare the bi-axial flexural strength of newly developed restorative ormocers with other composite and compomer restorative materials. Eight restorative materials were selected: two ormocers [Admira and Definite], three composite resins [1-100, Z-250, and Pyramid], and three compomers [Compoglass F, Dyract AP and Composan Glass]. Five 14 mm diameter x 2 mm thick disc-shaped specimens were prepared of each material using a silicone lubricated teflon mold. The specimens were stored in distilled water at 37°C for 24 hours before the biaxial flexural strengths were measured using an Instron universal testing machine. Definite had the lowest flexural strength mean [160.63 MPa] while Compoglass F had the highest [291.93 MPa]. Admira had a statistically insignificant difference [201.53 MPa] when compared to Definite. The strength of Compoglass F and Composan Glass were statistically equal to but different statistically from Dyract AP. The figures for Z-100 and Z-250 were not statistically different, but the strength of Z-250 was statistically different from Pyramid