Subperiosteal implants 569

or teeth exist, the utilization of a full subperiosteal (Universal-Weber) implant can be accomplished with the teeth still in place. The framework includes four posts and the substructure avoids impingement upon the anterior teeth. In this manner if the anterior teeth ever have to be extracted, a full arch implant denture can be utilized

to fit over the existing posts of the subperiosteal implant.

The following case clearly illustrates the technique. Only three anterior teeth remained; these sup-ported a five-unit splint (Fig. 12-101, A).

The remaining anterior teeth were prepared for full crown restorations. It was necessary to eliminate

A

C

B

D

Fig. 12-101. A, Only three teeth supported the anterior splint. B, The abutment teeth were pre-pared for full crown restorations and the tissue retracted to expose the bone. C, A cold cure acrylic tray was molded to the exposed bony landmarks. D, A rubber base impression was taken. E, The impression also included the three tooth impressions.