A device and technique for restoring the alveolar ridge of the human jawbone in the edentulous state. Such device involves an inert, porous tube which contains granules whereby when the device is in place on the ridge, tissue growth occurs from living bone through the porous tube inwardly or outwardly...http://www.google.com.au/patents/US4787906?utm_source=gb-gplus-sharePatent US4787906 - Controlled tissue growth and graft containment
