The evaluation of the shear bond strength between various Hybrid CAD/CAM restorative materials and repairing composite resins

The purpose of this study was to evaluate the shear bond strengths between various hybrid computer-aided\ndesign (CAD)/computer-aided manufacturing (CAM) restorative materials and repairing resin. Two resin network-based\nhybrid (Lava Ultimate and Polyglass), one ceramic framework-based hybrid (Enamic), and one zirconia (Zenotec\nZr bridge) CAD/CAM restorative materials were used in this study. The shear bond strength test and failure modes\nof four experimental groups designated LUS (Lava Ultimate), ENA (Enamic), PGB (Polyglass), and ZBR (zirconia\ncontrol group) were characterized in this study. The hybrid CAD/CAM restorative materials showed stronger shear\nbond strengths in the sequence of PGB, LUS, and ENA (P<0.05). The shear bond strengths of PGB and LUS\ngroups showed significantly higher than those of ZBR (P<0.05), while ENA did not show any significant difference\nfrom ZBR (P<0.05). The PEG and LUS groups mostly exhibited cohesive failure, but the ENA and ZBR groups\npredominantly showed adhesive failure. Therefore, resin network-based hybrid CAD/CAM restorative materials such\nas Lava Ultimate and Polyglass should be more useful for intra-oral repairs.