After the loss of a tooth, healing of the residual socket begins. Initially a coagulum forms. This is invaded by blood vessels and inflammatory cells from the adjacent medullary space, giving rise to a process called organization of the coagulum. The coagulum is subsequently replaced by bone tissue. The residual socket reduces in size as it no longer has the function of holding a tooth, and it therefore progressively atrophies, in some cases to such a degree that it becomes very difficult to insert a prosthesis to replace the lost tooth (1).