Spark erosion fixed/detachable prosthesis for the completely edentulous maxilla.

A technique is described for restoration of the completely edentulous maxilla. From six to eight root-form implants are surgically placed in the edentulous maxilla. A hybrid overdenture is constructed by use of a two-degree tapered precision milled primary bar. A cast overdenture prosthesis is constructed over this bar, and precision attachments are spark-erosion-processed to the primary and secondary prosthetic components. The technology described in this article allows for an intimate fit of the various prosthetic components. This prosthetic protocol permits maximum retention and stability of the prosthesis and solves many problems which are encountered in the oral rehabilitation of the edentulous maxilla.