When it is determined that a knife edge ridge exists beneath the soft tissues, fig. 178, a bone rongeur is sometimes used to remove it, fig. 179. In these situations where alveolar bone still exists anteriorly cross over struts made deep into the bone to its denser basal portion are made, fig. 180, to support the struts of the implant that support the anterior posts, figs. 181, 182. Healing in these situations also is usually excellent, fig. 183, and the denture is completed. Fig. 184 shows accuracy of the fit. Final x-ray, fig. 185.
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