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The International Journal of Oral & Maxillofacial Implants
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Int J Oral Maxillofac Implants 10 (1995), No. 4     1. July 1995
Int J Oral Maxillofac Implants 10 (1995), No. 4  (01.07.1995)

Page 462-465


Incidence and Suggested Surgical Management of Septa in Sinus-Lift Procedures
Ulm, Christian W. / Solar, Peter / Krennmair, G. / Matejka, Michael / Watzek, Georg
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.

Keywords: maxillary sinus, sinus-lift technique, Underwood's septa