Maxillary endosseous implant interventions 435

try the prosthesis over each implant and to hollow out its corresponding pontic before going on to the next implant.

After all the vent-plants were seated (Fig. 10-183) and the bridge with its hollowed pontics fitted properly over them, the operator had two choices. He could have fashioned acrylic lumens by placing cold cure acrylic within the hollowed pontics and repeatedly seated over Vaseline-covered implant shafts. On the other hand, he could have used interchangeable gold copings over the implant shafts,

Fig. 10-185. The pins were fastened with acrylic on both sides and the superstructures were cemented over the acrylic cores. In this case, acrylic was used inside the superstructure to secure them.

Fig. 10-186. The completed case.

Fig. 10-187. A Panorex of the completed case showing the vent-plants and the tremendous spread of the tripodial pins, which were used to avoid the broad and low-flaring maxillary sinus.