Fig. 3

Rheological behavior of collagen (Col), Col-P, hydroxyapatite (HA)-P hydrogel. A Storage modulus (G’) and loss modulus (G’’). B Complex viscosity (η). Mechanical property of Col-HA membrane. C Compression testing stress–strain curve of scaffolds and membrane. D Compressive young’s modulus from the slope of the stress–strain curve (n = 3, * p < 0.05, ** p < 0.01)