One must be extremely cautious when inserting four blades in a knife edge ridge, figs. 104, 105. In order to widen the occlusal table a bone rongeur is first used, fig. 106, followed by a rotary stone or fissure bur, fig. 107. The blades are then lined up in the grooves, fig. 108, and tapped to their proper depth. Because of failure to remove the right posterior blade and make the groove deeper I spread out the bone with the post of the implant that also became buried, fig. 109. I quickly removed it and using another blade and bending it like a "snake", fig. 110, I was able to re-insert it successfully, fig. 111. After suturing, fig. 112, healing was accomplished, although much slower in the right posterior area, fig. 113. A gold substructure was fitted, fig. 114.

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