Subperiosteal implants 567

After the elastic set, the two pins were pulled out of the impression in a labial direction so that the impression could be removed without tearing the material. The two pins were then immediately re-placed into the elastic impression (Fig. 12-89). A surgical wax interocclusal centric relation bite and an alginate impression of the lower arch of teeth were also taken.

A master investment model was poured into the elastic impression with the seated fixation pins (Fig. 12-90), and the subperiosteal framework was waxed up directly on the model. It was then cast after the fixation pins were removed (Fig. 12-91).

After the wound had healed, the tissue was once more anesthetized, incised, and reflected to expose the underlying bone. The sterilized subperiosteal frame-

E

C

B

D

E

Fig. 12-99. Periapical intraoral x-rays of five different cases utilizing the unilateral subperiosteal implant as the posterior abutments. These cases with the lingual fingers have been in the mouths of these patients from 7 to 12 years. A shows a 12-year postoperative radio-graph.