The impact of the amount of polymer on fracture toughness (K Ic ), and work of fracture at maximum stress (G max ) is noticeable (Tab. 2). The toughness K Ic , for example, is twice greater after 4 infiltration cycles (0.40M P a • m 1/2 after infiltration vs. 0.23M P a • m 1/2 before), despite a low amount of polymer introduced in the structure. This implies that the initiation of the fracture is not determined by just the amount of ceramic in the scaffold, since this amount is the same for the three conditions (0, 1 and 4 infiltration cycles). The addition of a polymer improved all the mechanical properties reported here. Once the fracture is initiated, the amount of organic phase also controls the resistance to crack propagation, as evidenced by the increase of G 7% values with infiltration cycles.