456 Theories and techniques of oral implantology

Fig. 10-264. A Panorex shows the seven vent-plants, triplant, and biplant. The lower jaw was also reconstructed with four vent-plants.

terial, and a final wax registration of centric relation was made. From these registrations and with the use of a specially designed Zelnigher articulator, the full arch fixed denture was processed (Fig. 10-261). Because the teeth were fabricated with acrylic occlusal surfaces, gold stops were made in a few of the occlusal surfaces to reduce wear on the acrylic (Fig. 10-262). The finished prosthesis was then cemented into place (Fig. 10-263). Temporary cement was used in case any implant ever needed attention. If such a situation arises, the operator can remove the bridge and drill away the acrylic covering the involved implant with a vulcanite bur.

The mixed implants supporting the prosthesis, their placement, and their relationships are clearly visible in Fig. 10-264.

Case 28

A full arch removable palateless denture for the edentulous maxilla using the internally threaded vent-plant, triplants, a template, and a mesostructure with surface-breaker attachments

Two other advances in improving the long-term stability of a full arch denture for the edentulous maxilla were combining a template and triplants with an internally threaded vent-plant and the soldering of "surface-breaker" attachments to the mesostructure.

A hollow threaded vent-plant was screwed into the nasal septum (Fig. 10-265). Care was taken to angle

Fig. 10-265. An internally threaded vent-plant was screwed into the center of the anterior maxillary process.

Fig. 10-266. The scalloped template was secured to the vent-plant by the small set screw. The pin implants were then drilled through predetermined holes in the template.