Fig. 4. Representative SEM images of zirconia surfaces after debonding (original magnification: 4000×). A: NC (control); B: WS (water-spray); C: AA (air-abrasion); D: IC (Ivoclean); E: SDS (sodium dodecyl sulfate); F: HP (H2O2); and G: SHC (NaOCl). For groups WS, SDS, and HP (images B, E, and F), some blister-like bubble formations are indicated by pointers.
