Fig. 4From: Comparing the shear bond strength of veneering materials to the PAEKs after surface treatmentsSEM images (× 1200) of PEEK and PEKK specimens: Untreated (Cnt) PEEK (A), PEKK (B); Plasma (Pls) applied to PEEK (C) and PEKK (D); 98% sulfuric acid (Sa) applied to PEEK (E) and PEKK (F); Sandblasted (Sb) PEEK (G) and PEKK (H); Tribochemical silica-coated (Tbc) PEEK (I) and PEKK (J); Sb + Sa applied PEEK (K) and PEKK (L); Tbc + Sa applied PEEK (M) and PEKK (N)Back to article page