Repair Bond Strength of Two Shadeless Resin Composites Bonded to Various CAD-CAM Substrates with Different Surface Treatments

This study compared the repair bond strength values of two single-shade composite resins bonded to different computer-aided design and manufacturing (CAD-CAM) substrates with surface treatments. A total 80 slice-shaped specimens were fabricated using CAD-CAM materials: Lava Ultimate VitaEnamic. The thermocycled then, based on treatment, each substrate material was subdivided into four groups: air abrasion group (APA), hydrofluoric-acid-etched (HF) silicon carbide ground groups (SiCr). All received silane followed by Single Bond Universal Adhesive application prior being repaired a resin smaller disc shape. shear testing subsequent failure analyses. Statistical analyses conducted, level statistical significance set at 0.05. comparison mean showed highly statistically significant difference among eight groups. highest value associated Charisma Diamond ONE after APA treatment (36.7 ± 1.99). Meanwhile, lowest recorded for Vita Enamic OMNICHROMA SiCr (17.8 1.6). analysis revealed that cohesive in most predominant. Within limitations this study, better Omnichroma. is recommended improved repairs restorations.