Bond Strength of Different Composite Resin Materials and CAD/CAM Restorative Materials to Each Other and Dentin Tissue

Objective: The aim of the current study is to investigate the strongest and weakest points of the three different structures of prosthodontic restorations constituting the coronal structure when considered as a whole: the remaining tooth, composite resin, and computer-aided design and computer-aided manufacturing (CAD/CAM) restorative materials. Methods: Seventy extracted caries-free molars, CAD/CAM blocks [Lava Ultimate (LU), Vita Enamic (VE), IPS e.max CAD (IPS)], and composite resin materials Clearfil Majesty Posterior [CMP], Light Core [LC], Filtek Bulk Fill Posterior [FBP], EverX Posterior [EP] were used for this study. Dentin and CAD/CAM sections were embedded in acrylic. Clearfil SE Bond was used as adhesive material. Composite resin materials were applied to the dentin surface using a Teflon mold. LU and VE were sandblasted with 50-μm Al2O3 for 10-sec. IPS was etched with HF for 20-sec. Ceramic Primer-2 was applied to the surfaces. Composite bars (2.3x3 mm) were adhered to CAD/CAM blocks using RelyX-U200. In addition, CAD/CAM bars were also adhered to dentin. The shear bond strength test was performed. Failure modes were examined using a stereomicroscope. Differences were analysed using one-way ANOVA and Tukey Post Hoc test. Results: The highest shear bond strength values of the composite resin materials to dentin tissue were observed in EP (p