Figure 6. Histological observations of interface between bone and screw in three groups at 6-week and 12-week.

“a”, “b” and “c” indicate CPS group, PMMA-PS group and EPS group, respectively. “1″ and “2″ indicate16 and 50 times magnification in microscope, respectively. Red color and saffron yellow color represent mature bone trabeculae and fibrous tissue, respectively. Round black and irregularly-shaped black colors represent screw and PMMA, respectively.