Investigation of the In Vitro Degradation of a Novel Polylactide/Nanohydroxyapatite Composite for Artificial Bone
Figure 11
SEM images of fracture surfaces of degraded PLLA biomaterials (×8000) ((a)-0 w; (b)-4 w; (c)-6 w; (d)-8 w; (e)-12 w; (f)-18 w). (a) and (b) smooth fracture surface without substantial cracks; (c) Surfaces showed a small amount of cracks as red arrows indicated, and the fracture edges still had compact structure; (d) the cracks in material surface extended to the peripheral area, and a large number of small holes appeared in the fracture surface as red arrows indicated; (e) the cracks of the material expanded to form slits, and the fracture surface was covered with holes as red arrows indicated; (f) materials had collapsed, and the material was destructed as a whole.
