Figure 4.

Freeze-dried mineralized bone allograft (toluidine blue and acid fuchsin): (a) newly formed bone with marrow spaces and particles of residual biomaterial was present. In a marginal portion of the sample, preexisting bone with small remodeling areas could be observed (original magnification 12X); (b) the biomaterial particles, showing areas of bone neoformation in their inner part, could be observed. Some of the biomaterial particles showed irregular margins, typical of a resorption process (original magnification 40X).