Ceramics-Silikáty 68, (4) 573 - 581 (2024)

Fifty-four ceramic discs (N = 54, 27 each for ZrO₂ and LDS) underwent treat-ments including sandblasting (SB), liner applications (ZirLiner for ZrO₂, wash-firing for LDS), and dentin powder sprinkling. Six groups were formed: Zr-SB (con-trol), Zr-Z (SB + ZirLiner), Zr-S (SB + ZirLiner + dentin powder), LDS-SB (control), LDS-WF (SB + wash-firing), LDS-S (SB + wash-firing + dentin powder). The surface roughness (Ra), SBS with pink porcelain, and failure modes were evaluated for 48 samples (eight per group), while the surface morphology was assessed using scanning electron mi-croscopy (SEM) for six samples per group. For the ZrO₂ samples, the greatest sur-face irregularities were seen after the liner application (Zr-Z); for the LDS, they were seen for the dentin powder sprinkled samples (LDS-S). Zr-Z showed the highest Ra among the ZrO₂ groups, while LDS-S exhibited the highest Ra among the LDS groups. The highest SBS was observed in the Zr-S and LDS-WF groups for ZrO₂ and LDS, respectively. Adhesive and mixed failures occurred between the ceramic and porcelain for both the ZrO₂ and LDS groups. The dentin powder sprinkling post-SB and liner application improved the ZrO₂-porcelain bond strength while the wash-firing en-hanced the LDS-porcelain bond strength significantly. The long-term effectiveness requires further investigation into the mechanical and chemical surface modifications and the rea-sons behind the veneering ceramic delamination.