CBCT images: an important tool in the analysis of anatomical variations of maxillary sinus related to Underwood septa features

Autor: Deyan Neychev, Petya Kanazirska, Kiril Simitchiev, Georgi Yordanov
Jazyk: angličtina
Rok vydání: 2017
Předmět:
Zdroj: Biotechnology & Biotechnological Equipment, Vol 31, Iss 6, Pp 1210-1215 (2017)
Druh dokumentu: article
ISSN: 1310-2818
1314-3530
13102818
DOI: 10.1080/13102818.2017.1369902
Popis: The lack of prior information on the presence of Underwood septa is the most common anatomical cause of Schneider's membrane perforation during maxillary sinus floor elevation with lateral access. The objective of this study was to assess the incidence of Underwood septa, their location, type (primary or secondary) and height in Bulgarian patients. Cone beam computed tomography (CBCT) images of 200 patients were examined for the presence of Underwood septa. Presence of at least one septum was found in 144 patients. The non-parametric statistical Mann–Whitney U-test and Fisher's exact test were used. No statistically significant differences were found between the two genders in terms of the presence of septa. In toothed patients, the location of the septa was behind the distal surface of the second molar in 57% of the cases. In patients with edentulous distal portions of the maxilla, location of the septa in the areas above the first premolar was seen in 54% of the cases. Depending on the presence of teeth, primary complete septa were found in toothed patients, and secondary partial septa were observed in edentulous patients. Prevalence of sagittal primary orientation was found in toothed patients (63%), while axial primary orientation of the septa was found in edentulous patients (58%). The obtained results suggest that precise determination of the septum orientation by CBCT would facilitate the correct choice of surgical approach to minimize the risk of Schneider's membrane perforation.
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