172 Theories and techniques of oral implantology

who did his first subperiosteal implant in 1942.* Another early pioneer was the American W. D. Weinberg. Weinberg's early implant, done in 1948, was a single-unit restoration using a latticed frame-

*Dahl, G. S. A.: Om mojligheten for implantation i kaken av metallshelett som bas eller retention for fasta eller avtagbare proteser, Odont. Tidsk. 4:440, 1943.

work (Fig. 5-72).* The framework was bent to the shape of the bone and cut. Its free edges were joined by a strip to make the edges smooth, and an abutment post was soldered on four legs to the frame-work's crest.

*Weinberg, W. D.: Subperiosteal implantation of a Vitallium artificial abutment, J.A.D.A. 5:549, 1950.

Fig. 5-74. A full mandibular subperiosteal implant of the earliest designed Vitallium frame-work of Gershkoff and Goldberg. (Courtesy Howmedica, Inc.)

Fig. 5-75. Gershkoff and Goldberg's narrow strip of metal lay on top of the mandible and was held in place by screws. (From Gershkoff, A., and Goldberg, N.: Implant lower denture, Dent. Dig. 55:490-494, 1949.)