Figure. SEM images of the fractured interface on the dentin side of debonded specimens (A) after 24 hrs of water storage and bonded with phosphoric-acid-etching and Adper Scotchbond 1. Note failure at the base of the hybrid layer, showing partial cohesive fractures (CF) of demineralized dentin just below the hybrid layer. (B) After 24 hrs of water storage and bonded with EDTA treatment and Adper Scotchbond 1. Note failure at the top of the hybrid layer. No cohesive fracture of dentin is evidenced, and a mild dentin demineralization pattern not affecting peritubular dentin is observed. (C) After 24 hrs of water storage and bonded with Clearfil SE Bond. Failure is found either at the adhesive resin layer (AR), at the base of the hybrid layer (BHL), or within the hybridized smear layer (HSL) in the same image. (D) Bonded with phosphoric-acid-etching and Adper Scotchbond 1, and debonded after NaOCl_aq immersion. The intertubular dentin appearance is that of etched and NaOCl_aq-treated dentin, showing no collagen and enlarged tubules with many interconnecting canals. (E) Bonded with EDTA treatment and Adper Scotchbond 1, and debonded after NaOCl_aq immersion, intertubular dentin is not affected by NaOCl_aq, peritubular dentin is observed, and some tubule entrances remain resin-occluded. (F) Bonded with Clearfil SE Bond, debonded after NaOCl_aq immersion. Main failure is visible within the hybridized smear layer (HSL), and intertubular dentin remains unaltered by the NaOCl_aq.