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A dummy implant (4.5x17 mm) is placed to show its approximation to the sinus floor (Fig.4). After removal of the dummy implant, the definitive implant is placed with certainty with the planned abutment (Fig.5 A). An immediate provisional is placed after bone graft and membrane.
The immediate provisional is found to be fractured 4 months postop. PA is taken to confirm osteointegration (Fig.6 periimplant space closed). With implant threads buried deep in the bone, there is less likelihood to develop periimplantitis.
Xin Wei, DDS, PhD, MS 1st edition 02/22/2016, last revision 01/19/2018