Fig. 3.

Examination of HCB structures. Photograph of CO₃Ap, HAp, and β-TCP HCBs (A). Stereomicroscopy images of CO₃Ap (B), HAp (C), and β-TCP HCBs (D). SEM images of CO₃Ap (E, H), HAp (F, I), and β-TCP HCBs (G, J). “*” and “#” indicate HC strut and macropore, respectively. Magnified SEM images of the struts of CO₃Ap (H), HAp (I), and β-TCP HCBs (J).