A connecting device for oral and extra-oral prostheses which is partially implanted in bodily tissue, primarily bone tissue, by means of an anchorage unit (a fixture) that provides more favorable stress and force distribution between the implanted and the outer portion of the prosthesis located peri-tissually....http://www.google.es/patents/US4756689?utm_source=gb-gplus-sharePatente US4756689 - Connecting devices
