Fig. 2.

Characterization of the scaffolds. a. SEM images of the surface topography of PTZ scaffolds. b. Micro-CT images of the internal pore connectivity of PTZ scaffolds. c. SEM images of the surface topography of the three groups of scaffolds. d. Ca (blue), P (yellow) and Zn element (green) analysis of PTZ scaffold using SEM-EDS. e. FTIR analysis of functional groups in three scaffolds. f. Stress-strain curves of the three scaffolds. f. The Young's modulus of three scaffolds. g. The compressive strength of three scaffolds. h. Cumulative release of Ca²⁺ from PT, PTZ scaffolds and Zn²⁺ from PTZ scaffolds within 16 weeks in vitro.