A coupling for removable dental protheses comprising a male member one end of which is constituted by a fixing member, whereas the other end has the shape of a male coupling member and a female portion comprising a rigid casing fixed into the prothesis which houses a resiliently deformable mass provided...http://www.google.es/patents/US5211561?utm_source=gb-gplus-sharePatente US5211561 - Coupling device for dental prothesis
