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Volume 10 , Issue 4
July/August 1995

Pages 462-465


Incidence and Suggested Surgical Management of Septa in Sinus-Lift Procedures

Christian W. Ulm, MD, DMD/Peter Solar, MD, DMD/G. Krennmair, MD/Michael Matejka, MD, DMD/Georg Watzek, MD, DMD


PMID: 7672849

A variable number of septa, also referred to as Underwood’s septa, divide the floor of the maxillary sinus into several recesses and may thus cause various complications during sinus-lift procedures. The incidence of Underwood’s septa was evaluated by examining 41 edentulous maxillas. In 13 of these maxillas (31.7% of the cases), sinus floors with at least one septum were observed. Most of the septa were located in the region between the second premolar and the first molar. A possible cause of septal formation could be the variable phases of maxillary sinus pneumatization of the empty alveolar process following tooth extraction. (INT J ORAL MAXILLOFAC IMPLANTS 1995;10:462–465)

Key words: maxillary sinus, sinus-lift technique, Underwood’s septa


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