title: Incidence and suggested surgical management of septa in sinus-lift procedures.
abstract: 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.
authors.affiliation: Department of Oral Surgery, School of Dentistry, University of Vienna, Austria.
authors.forename: C W
authors.initials: CW
authors.lastname: Ulm
authors.forename: P
authors.initials: P
authors.lastname: Solar
authors.forename: G
authors.initials: G
authors.lastname: Krennmair
authors.forename: M
authors.initials: M
authors.lastname: Matejka
authors.forename: G
authors.initials: G
authors.lastname: Watzek
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000539:Alveolar Process / Q000473:pathology; D001284:Atrophy; D001641:Bicuspid; D005260:Female; D006801:Humans; D015994:Incidence; D007575:Jaw, Edentulous / Q000473:pathology; D008297:Male; D008437:Maxilla / Q000473:pathology; D008443:Maxillary Sinus / Q000033:anatomy & histology* / Q000601:surgery*; D008875:Middle Aged; D008963:Molar; D010027:Osteotomy; D014081:Tooth Extraction