After 180 days of healing, beneath the marginal cortical bone at the entrance of the socket as denoted by the arrow, most of the socket is filled with trabecular bone that includes large marrow spaces. The bone is characterized by a limited number of trabeculae of lamellar bone. The bone marrow contains large numbers of adipocytes but only a few inflammatory cells. It should be noted that the time frame for healing in this dog study would be quicker than that in human beings, and therefore caution should be exercised in interpreting these results.