Mechanical and optical properties of indirect veneering resin composites after different aging regimes

This study tested and compared properties of six modern indirect veneering resin composites (VRC), namely Ceramage (Shofu), dialog Vario (Schütz Dental), Gradia Plus (GC Europe), in:joy (Dentsply), Signum composite (Heraeus Kulzer), and SR Nexco (Ivoclar Vivadent). Specimens were fabricated from dentin and enamel pastes and following properties were analyzed: (1) two-body wear (TB), (2) surface roughness (SR), (3) Martens hardness parameters (HM and E_IT), and (4) translucency (T). The highest impact on HM and E_IT was exerted by VRC brand (HM: η_P²=0.960/ E_IT: η_P²=0.968; p<0.001), followed by VRC paste material (HM: η_P²=0.502/ E_IT: η_P²=0.580; p<0.001), and aging duration (HM: η_P²=0.157/ E_IT: η_P²=0.112; p<0.001). Lowest and highest TB were measured for Signum composite and dialog Vario, respectively (p<0.001). Highest T was showed Signum composite and Ceramage (p<0.001). VRCs should be individually selected with respect to the indication area, due to different surface properties.