Bone mineral content of the 2- and 4-week specimens of calvarial critical-sized defects.

<p>At 2-1, VEGF, and PDGF. At 4 weeks, there were no differences in bone mineral content among the groups containing SDF-1, BMP, PDGF, and VEGF, while the membrane only group had the least amount of bone mineral content. * represents p<0.01, # represents p<0.05. White bars represent 2-week specimens, and black bars 4-week specimens.