Hydroxyapatite coating effect on the bond strength between CAD/CAM materials and a resin cement

[Abstract] The purpose of this study was to evaluate the bond strength between CAD/CAM materials and a resin cement using hydroxyapatite coating as a surface treatment method. Different surface treatments (Control, no treatment-C; Sandblasting-SB; Hydrofluoric acid etching-HF; applying tooth desensitizer-TeM; applying topical creme-ToM, HAp coating with Pulse Laser Deposition technique-PLD) were applied to three different CAD/CAM materials (LAVA Ultimate, VITA Enamic, and Cerec Blocs). After surface treatments, a universal adhesive (Single Bond Universal, 3M ESPE) was applied and adhesive resin (Rely X Ultimate, 3M ESPE) were cemented on each material surface using plastic tubes (4 mm in diameter). The shear bond strength values were measured using a universal testing machine. Scanning electron microscope analysis were performed to evaluate failure modes and effects of surface treatments. Obtained data were statistically analyzed using two-way ANOVA and Tukey's post hoc test (p=0.05). The bond strength of PLD groups were significantly higher than other groups in resin-ceramics (p