Unilateral subperiosteal implants have been successful in many cases, although they have been abandoned for the more predictable unilateral pterygoid extension implant with its superior bracing action. Here (1) a unilateral sub periosteal implant is inserted in a posterior edentulous span. Note that the post arises from a cross strut, and the "roll bar" effect of the buccal strut. The implant is seated (2), and when the site heals (3) the impression is taken for a four-unit splint (4), using the implant post as posterior anchorage and the prepared cuspid as anterior anchorage.

225