Abstract
The 3-point bending test specified by ISO 6875: 1995 for resin-based filling materials and that by the ISO 4049:1988 for dental ceramics were employed to evaluate the effects on the flexural properties of dental restorative materials. A Ag-Pd alloy, a Ag-Sn alloy (JIS type 1 silver alloy), a Ag-In alloy (JIS type 2 silver alloy), two castable ceramics, a ceramic block for CAD/CAM, a composite resin for filling, two composite resins for veneering, a composite resin for core build-up, and a composite resin block for CAD/CAM and bovine dentin were examined. Flexural strengths of the Ag-Sn alloy and one of the castable ceramics obtained from two test methods were significantly different:flexural moduli of two castable ceramics, photo-curing composite resins and the photo-and chemical-curing composite resin obtained from two test methods were significantly different. The reasons for these discrepancies were considered because of the heterogeneity of the surface and the inside of castable ceramics and the effect of specimen geometry on the conversion ratio of composite resins.
