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The aim of the present study was to evaluate the involvement of the maxillary sinus ostium in the edematous processes after a sinus floor augmentation procedure.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Methods<\/jats:title>\n<jats:p>Seventy-two cone-beam computerized tomographies (CBSTs) were taken before sinus floor augmentation and after 1\u2009week and 9\u2009months from surgery and analyses. Sinus mucosa thickness and area, ostium diameter and patency, and extension of the post-surgical transient mucosal thickening in relation to the ostium were evaluated on the CBCTs for all three periods. The term \u201cvirtual\u201d when referring to sinus mucosa thickness and area was introduced because of the edema and bleeding that both contributed to a transient thickening and additional elevation of the sinus mucosa.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Results<\/jats:title>\n<jats:p>The mean virtual thickness of the sinus mucosa was 2.7 \u00b1 4.0\u2009mm, 7.7 \u00b1 7.1\u2009mm, 1.7 \u00b1 2.0\u2009mm before surgery, and after 1\u2009week and 9\u2009months. The virtual mucosa area was 37.2 \u00b1 52.5\u2009mm<jats:sup>2<\/jats:sup>, 184.5 \u00b1 153.8\u2009mm<jats:sup>2<\/jats:sup>, and 34.0 \u00b1 50.7\u2009mm<jats:sup>2<\/jats:sup>. The ostium diameter at the three periods evaluated was 1.8 \u00b1 0.5\u2009mm, 1.1 \u00b1 0.6\u2009mm, 1.5 \u00b1 0.8\u2009mm, respectively. Three infundibula (4.2%) were found out of patency before surgery while this number increased to 14 (19.4%) after 1 week. Nine months after surgery, only one infundibulum (1.4%) was out of patency, however, without presenting signs of sinus pathologies. The extension of the mucosal edema on the palatal sinus was reduced after 9\u2009months of healing.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Conclusions<\/jats:title>\n<jats:p>One week after sinus floor augmentation, the maxillary sinus mucosa increased in dimensions and in several cases involved the ostium, reducing its diameter and producing a transient loss of patency. After 9\u2009months of healing, the initial conditions were recovered.<\/jats:p>\n<\/jats:sec>","DOI":"10.1186\/s40729-020-00233-7","type":"journal-article","created":{"date-parts":[[2020,8,2]],"date-time":"2020-08-02T23:02:17Z","timestamp":1596409337000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Involvement of the maxillary sinus ostium (MSO) in the edematous processes after sinus floor augmentation: a cone-beam computed tomographic study"],"prefix":"10.1186","volume":"6","author":[{"given":"Shigeru","family":"Sakuma","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mauro","family":"Ferri","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hideki","family":"Imai","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natalia","family":"Fortich Mesa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel Jos\u00e9","family":"Blanco Victorio","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karol Al\u00ed","family":"Apaza Alccayhuaman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2804-1632","authenticated-orcid":false,"given":"Daniele","family":"Botticelli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,8,3]]},"reference":[{"issue":"8","key":"233_CR1","first-page":"613","volume":"38","author":"PJ Boyne","year":"1980","unstructured":"Boyne PJ, James RA. 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The patients were informed about the procedures and the possible complications and signed informed consent.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Consent to publish was obtained from all applicable parties.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"Shigeru Sakuma declares no competing of interest regarding this study.Mauro Ferri declares no competing of interest regarding this study.Hideki Imai declares no competing of interest regarding this study.Natalia Fortich Mesa declares no competing of interest regarding this study.Daniel Jos\u00e9 Blanco Victorio declares no competing of interest regarding this study.Karol Al\u00ed Apaza Alccayhuaman declares no competing of interest regarding this study.Daniele Botticelli declares no competing of interest regarding this study.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"35"}}