Fig. 4From: In vitro comparison of the osteogenic capability of human pulp stem cells on alloplastic, allogeneic, and xenogeneic bone scaffoldsHistological images of calcein AM and of DAPI staining a after 3 days and b after 7 days. c Graphs of calcein AM analysis after 3 days and d after 7 days. Stem cells without bone substitute served as control. 50× Magnification. *(p < 0.05); ***(p < 0.001)Back to article page