Fig. 3From: The effect of nano-hydroxyapatite/chitosan scaffolds on rat calvarial defects for bone regenerationTwo–5 mm in diameter—full thickness critical size defects were trephined in both sides of the parietal bone (a, b). A 75/25 w/w nHAp/CS scaffold was placed in the right defect, while the left remained empty (c). The excised specimen (15 × 2 × 10 mm) of rat’s calvaria (d)Back to article page