The core sample tissue included bundle bone of the cribriform plate of the interradicular bone between the mesial and distal roots. This bone lined the original extraction socket. The bone was necrotic and devoid of osteocytes (Figure 10). This histological sample supports the authors' contention that the bone lining the extraction socket dies and becomes necrotic; however, in sockets treated with Socket Graft, new bone forms over the necrotic bone and osteoclastic resorption of the socket wall does not occur.