When the edentulous posterior maxilla shows severe atrophy (Cawood and Howell Class V to VI), the traditional approach requires at least two surgical procedures. The first is a sinus lift (alone or with guided bone regeneration), and the second is to position implants. This article illustrates a technique that allows three-dimensional reconstruction of the sinus, placing an allogenous fresh bone block and simultaneous implant positioning using a computer-guided implant surgery.
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