Figure 3. Scanning electron microscope images of computer-aided design/computer-aided manufacturing polymer-ceramic after treatment. (A) Etched surface of Enamic (×2,500); (B) With higher magnification (×5,000), larger holes (white arrow) within a relatively unaffected polymer phase (red arrow) are seen; (C) Lava Ultimate after sand blasting (×2,500); (D) With higher magnification (×5,000), Lava Ultimate showed more roughness and porosity than untreated specimens. The cracks in the matrix could be seen (white arrow).