Sometimes also, in short spans that have knife edge ridges we are able to place into the bone smaller type bladevents, fig. 34, which serve well in supporting two unilateral fixed bridges, fig. 35. The radiographs show the well placed blades, figs. 36, 37.

Most often, however, two anterior abutment teeth are used, rather than one for anterior sup-port for a fixed bridge, figs. 38 through 43. A panoramic x-ray shows the completed case, fig. 44.

Parallelism of the blade posts with the anterior abutment teeth is necessary for passive insertion of a fixed partial prosthesis, figs. 45, 46.

In order to acquire the proper inter-occlusal relationship with the opposing teeth, it must be decided whether a double posted blade or, as in this case, a single posted bladevent, should be used, fig. 47.

160