Dental fixation device for dental prostheses which comprises an elastic fixation element with shape memory (5) fixed to the dental prosthesis, where by means of the activation of the elastic fixation element with shape memory (5) by means of an external activator agent, a change of geometry of said elastic fixation element with shape memory (5) is produced which in turn causes a retaining of the dental prosthesis on the dental implant (1), where the retaining of the dental prosthesis on the dental implant (1) is maintained until a new external activator/deactivator agent causes a deactivation of the elastic fixation element with shape memory (5), said elastic fixation element with shape memory (5) modifying its geometry, releasing the dental prosthesis for the removal thereof from the mouth of the user.
