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This retrospective study aimed to analyze the effect of ridge preservation procedures following the extraction of molars with severe periodontitis on the healing pattern of adjacent maxillary sinus mucosal membranes.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Thirty-one periodontally compromised maxillary molar teeth either receiving ridge preservation (test group, n\u2009=\u200920) or undergoing spontaneous healing (control group, n\u2009=\u200911) were investigated. Cone-beam computed tomography (CBCT) scanning was performed before the extraction procedure and repeated 6\u00a0months later. The mucosa thickness (MT) of the adjacent periodontally compromised molar tooth was measured from CBCT images before tooth extraction and after 6\u00a0months of healing at nine assigned measurement points. The data were analyzed at \u03b1\u2009=\u20090.05.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>The prevalence of pre-extraction maxillary sinus mucosal thickening was 60.0% and 63.6% in the test and control groups, respectively. The average MT of the thickened sinus mucosa before tooth extraction was 3.78\u2009\u00b1\u20092.36\u00a0mm in the test group and 4.63\u2009\u00b1\u20093.20\u00a0mm in the control group (<jats:italic>P<\/jats:italic>\u2009=\u20090.063). The mean mucosal thickening reductions in the thickened MT subjects after 6\u00a0months of healing were 2.20\u2009\u00b1\u20092.05\u00a0mm (test group) and 2.64\u2009\u00b1\u20092.70\u00a0mm (control group), <jats:italic>P<\/jats:italic>\u2009=\u20090.289. The differences of MT between the time prior to extraction and after 6\u00a0months of healing were statistically significant within both groups (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Following extraction of molars with severe periodontitis, a reduction in swelling of the Schneiderian membrane has been observed regardless of the addition of a DBBM socket graft. However, a mucosal thickness\u2009&gt;\u20092\u00a0mm was still frequently observed.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12903-021-01546-8","type":"journal-article","created":{"date-parts":[[2021,4,12]],"date-time":"2021-04-12T05:02:41Z","timestamp":1618203761000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Effect of ridge preservation at molar extraction sites with severe periodontitis on the Schneiderian membrane thickness changes: a pilot study"],"prefix":"10.1186","volume":"21","author":[{"given":"Yiping","family":"Wei","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bo","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gang","family":"Yang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tao","family":"Xu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenjie","family":"Hu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kwok-Hung","family":"Chung","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,4,12]]},"reference":[{"key":"1546_CR1","volume-title":"Newman and Carranza\u2019s Clinical Periodontology","author":"MG Newman","year":"2018","unstructured":"Newman MG, Takei HH, Klokkevold PR, Carranza FA. 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