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The aim of this study was to investigate maxillary sinus abnormalities in asymptomatic patients by using CBCT.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>1113 CBCT were evaluated by two examiners and identification of abnormalities, the presence of periapical lesions and proximity to the lower sinus wall were recorded. Data were analyzed using descriptive statistics, chi-square tests and Kappa statistics.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Abnormalities were diagnosed in 68.2% of cases (kappa = 0.83). There was a significant difference between genders (p &lt; 0.001) and there was no difference in age groups. Mucosal thickening was the most prevalent abnormality (66%), followed by retention cysts (10.1%) and opacification (7.8%). No association was observed between the proximity of periapical lesions and the presence and type of inflammatory abnormalities (p = 0.124).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Abnormalities in maxillary sinus emphasizes how important it is for the dentomaxillofacial radiologist to undertake an interpretation of the whole volume of CBCT images.<\/jats:p><\/jats:sec>","DOI":"10.1186\/1472-6831-12-30","type":"journal-article","created":{"date-parts":[[2012,8,10]],"date-time":"2012-08-10T18:14:35Z","timestamp":1344622475000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":138,"title":["Occurrence of maxillary sinus abnormalities detected by cone beam CT in asymptomatic patients"],"prefix":"10.1186","volume":"12","author":[{"given":"Inara Carneiro Costa","family":"Rege","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thiago Oliveira","family":"Sousa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cl\u00e1udio Rodrigues","family":"Leles","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elismauro Francisco","family":"Mendon\u00e7a","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2012,8,10]]},"reference":[{"key":"238_CR1","doi-asserted-by":"publisher","first-page":"561","DOI":"10.1016\/j.tripleo.2008.07.007","volume":"106","author":"L Carter","year":"2008","unstructured":"Carter L, Farman AG, Geist J, Scarfe WC, Angelopoulos C, Nair MK, et al: American Academy of Oral and Maxillofacial Radiology Executive Opinion Statement on Performing and Interpreting Diagnostic Cone Beam Computed Tomography. 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