All on four prostheses will avoid bone loss because the dentures are not depending on the gums and underlying bone for support. The dental implants support the prostheses and all of the forces are transmitted through the implants into the bone in a similar way that forces are transmitted to natural teeth. Dentures without implants cause bone loss because they put pressure on the gum tissue and bone from the top down. None of the forces are transmitted into the bone which actually stimulates the bone and maintains it. It's a difficult concept to grasp but very well proven.
