Evaluation of Adhesion Between Carbon Fiber Frameworks and Esthetic Veneering Materials

Purpose: To assess bond strength and failure patterns of carbon fiber-reinforced composite (CFRC) and veneering materials. Materials and Methods: A total of 20 samples were prepared: 10 veneered with polymethylmethacrylate (group A) and 10 with composite resin (group B). Shear bond strength (SBS) was measured, and failed samples were microscopically observed. Results: The mean ± standard deviation (SD) SBS of specimens in group A was slightly higher (7.39 ± 0.24 MPa) than specimens in group B (5.68 ± 0.29 MPa). Microscopic observation showed an adhesive fracture pattern at the CFRC-adhesive interface in both groups. Conclusion: Adhesion between CFRC and veneering material is reliable and predictable, although a specific protocol needs to be developed to improve adhesion.