Figure 5.

The scanning electron microscopy (SEM) images of different surface treatments at a magnification of 2000×; (A) the F1 group: 35% Phosphoric etching; (B) the P1 group: no treatment; (C) the P2 and P4 groups: alumina particle abrasion; (D) the P3 group: silica-coated alumina particle abrasion): in the PEKK post with a surface that was sandblasted with 110 µm aluminum oxide and then blasted with a silica-modified aluminum oxide, irregular particles and a roughness were presented. The mechanical surface pre-treatments tended to form rougher surfaces.