Corresponding Author

Ahmed Mohamed Abd El-Khbeer

Article Type

Original Article


Objective: To assess the impact of different dentin conditioning methods and two resin cements on the bond strength of zirconia ceramics to dentin.

Materials and Methods: A total of 64 zirconia discs fabricated using CAD/CAM technology of dimensions (8mm diameter ×3mm thickness) and 64 molars mounted in plastic rings with acrylic resin were prepared by exposing flat coronal dentin surfaces. They were divided into 4 main groups (n=16) according to dentin surface treatment; Dentin as cut, treated with EDTA, Polyacrylic Acid (PAA), and self-etch adhesive. Each main group was subdivided into 2 subgroups (n=8) according to the luting cement used: adhesive resin cement (VITA ADIVA® F-CEM)& self-adhesive resin cement (Calibra®Universal). After bonding, all specimens were stored in a water bath at 37⁰C for 6 months followed by 10.000 thermal cycles. After artificial aging, bonded specimens underwent shear bond strength testing using a universal testing machine. Two-way ANOVA was used to test significant differences in shear bond strength between the cements and between the surface treatments followed by the post hoc Tukey test for correction of p value resulting from multiple comparisons.

Results: There was a significant difference in shear bond strength between surface treatments. The highest was reported with Self-etch adhesive (1.38MPa), followed by PAA, then EDTA surface treatments and the lowest was reported with as cut dentin (0.16MPa). Also, There was a significant difference between each two surface treatments except between PAA and EDTA for the adhesive resin cement group (p-value=0.79).

Conclusion: Define dentin surface treatment with self-etch adhesive is recommended before bonding zirconia restoration over all the conditioning materials, followed by PAA and EDTA specially with self-adhesive resin cement (Calibra universal)


Zirconia Ceramics, Self-Adhesive Resin Cements, Dentin Conditioning