Implant histology 103

severed from one another. The implant in the nasal septum was loose and easily removed (Fig. 4-40). The other vent-plants were extremely firm and were removed so as to include bone blocks (Fig. 4-41) .

Histologic reports from Dr. George Greene, Jr., of the University of Buffalo, Buffalo, New York, revealed that the tissue adjacent to the bone-encapsulated implants was fibrous in nature, with the fiber content predominating and with a small amount of

cellularity (Fig. 4-42). Deeper in the tissue around each implant was a ring of bone. The side toward the implants exhibited active osteogenesis, indicating deposition of bone toward the implant site (Fig. 4-43). Other studies at this deeper level showed the inner aspect of the fibrous tissue as it butted against the implants (Fig. 4-44) . On the whole, fiber elements predominated over the cellular elements. However, near the implant there were more cells and the fiber

Fig. 4-43. A, In addition to the collagenous pseudoperiodontal membrane around the implant site (X), osteogenesis of the bone is seen (arrow) with the osteoblasts lined up toward the implant site. B, Under higher power, osteocytes are clearly visible in their lacunae.