Figure 2. Topographic SEM images and corresponding EDS spectra of the surfaces subjected to 6 different pre-treatments. Note that only the PO and BR spectra show Zr peaks. PO, polishing unglazed zirconia; BR, bur roughening; PP, cleaning with a prophy cup and pumice; HF, hydrofluoric acid etching; AA, air-particle abrasion with aluminum oxide; CJ, silicon dioxide [CoJet-Sand] particles.
