Objectives: The purpose of this study was to investigate the effect of the surface treatment by APF (Acidulated Phosphate Fluoride) with heat treatment on the bonding to the CEREC ceramics and marginal fracture of the CEREC2 restoration. Methods: The CEREC Vitablocs Mark 2(A3.5C, I8) were sectioned into 2.0 mm thickness and polished with SiC-paper to 800 grit. Polished ceramics specimens were distributed into following two groups; treated by 2% APF (Floden A; Sunstar) with heat treatment (100^o/ 5 min); AP, and without APF treatment as a control; CP. After the treatment, silane-coupling agent (Ceramic Primer; 3M) was applied, followed by a dual cured resin cement system (Rely X ARC; 3M). The adhesive system was combined with a composite resin (Z250; 3M) and tensile bond strength test was performed after storage in 37^owater for 24 hours (n=8). Standardized cavities were prepared in the extracted human molars. Two groups of CEREC2 inlays, AP and CP, were bonded to the cavities with Rely X ARC and were supplied to the marginal fracture test under thermocycling (4^o/60^o,125cycles) and simultaneous repeated load (12kgf x 10⁴). The restored specimens after the test were measured by digital microscope. The data was statistically analyzed using ANOVA and q-test. Results: Mean value of the tensile bond strength were AP; 17.2(2.8) > CP; 11.0(2.4) MPa (SD). There was a significant difference between AP and CP (p<0.01). The ratio of marginal fracture area were AP; 12.4% < CP; 19.9%. There was a significant difference between AP and CP (p<0.05). Conclusions: The method of APF treatment with additional heat treatment was effective for the bonding to the CEREC ceramics and reduced the ratio of marginal fracture to the CEREC2 restoration.

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