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Comparison of the SEM images (×2000 magnification) of the interfaces between ceramic and resin cement in the specimens. (A) HF only, (B) HF and silane, (C) HF and ABU, (D) HF, silane, and ABU, (E) HF and PB, (F) HF, silane, and PB, (G) HF and SBU, (H) HF, silane, and SBU, (I) HF and CU, (J) HF, silane, and CU. c = ceramic, a = adhesive, r = resin cement.
