Sometimes in very wide ridges where two teeth instead of only one were missing, fig. 37, a groove was made into the bone with a mesial and distal accessory groove that curved at opposite angles buccally and lingually to the main groove. A specially designed double posted bladevent with the proper buccal and lingual bends was used, fig. 38, and fitted into the "atypical" groove, figs. 39, 40. A two unit veneer bridge with a mesial and distal rest seat was then cemented with hard cement, fig. 41, and a post operative radiograph taken, fig. 42.

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