Wherever abutment teeth must be helped by further support other than the fixed bridge itself intra-tooth bladevents serve the purpose exquisitely, figs. 59, 60, 61. Notice in this nine year post-operative film that the originally broken blade (because of probably too shallow a groove and too hard tapping) caused no further bone damage, fig. 62.

Periodontally involved teeth that were over retained with wiring are often removed completely with immediate insertions of blades. These can go much deeper into the great depth of bone that exists in the symphyseal region than were the original teeth, thus aiding in the overall retention of the remaining weak teeth, figs. 63, 64, 65.

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