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This study aimed to determine the vertical relationship between posterior maxillary teeth and maxillary sinus floor in different skeletal classes in the Chinese adult population.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>This is a retrospective cross-sectional study involved cone beam computed tomography images of 298 adult patients (145 males and 153 females) between 20 and 45 years old. The sample was categorized according to A point, Nasion, B point (ANB) angle into 102 Class I, 102 Class II, and 94 Class III malocclusion. Non-parametric Wilcoxon Mann\u2013Whitney U and Kruskal\u2013Wallis tests were used to compare the studied groups. The Intra-class Correlation Coefficient (ICC) was used to assess the intra- and inter-observer reliability analysis.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Overall, there was a statistically significant difference in the mean distance between both genders (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.001). The measured distance increased with age in all posterior tooth roots (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.001). The root apex in the sagittal view appeared to be closer to the maxillary sinus than in the coronal view; 2.2\u2009\u00b1\u20094.3 and 3.1\u2009\u00b1\u20095.5\u00a0mm, respectively. The most frequent root scores were Type 1 and Type 2P. In both sagittal and coronal views, Class I demonstrated a higher Type 2P prevalence, whereas Class III showed a lower prevalence. The second molars\u2019 mesiobuccal root had the largest number of penetration in the three examined skeletal classes.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Maxillary molars of Class I malocclusion with the majority of Type 2P root-sinus relationship have the highest possible risk of root resorption during molar intrusion due to cortical bone encroachment, while Class III malocclusion showed the least possible risk.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s13005-022-00316-3","type":"journal-article","created":{"date-parts":[[2022,4,12]],"date-time":"2022-04-12T07:02:56Z","timestamp":1649746976000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Three-dimensional assessment of the favorability of maxillary posterior teeth intrusion in different skeletal classes limited by the vertical relationship with the maxillary sinus floor"],"prefix":"10.1186","volume":"18","author":[{"given":"Ehab A.","family":"Abdulghani","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abeer A.","family":"Al-Sosowa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maged Sultan","family":"Alhammadi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hanan","family":"Al-fakeh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Waseem Saleh","family":"Al-Gumaei","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abeer A.","family":"Almashraqi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hasan M.","family":"Sharhan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"BaoCheng","family":"Cao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,4,12]]},"reference":[{"key":"316_CR1","doi-asserted-by":"publisher","first-page":"37","DOI":"10.4103\/2348-3334.172397","volume":"3","author":"AD Souza","year":"2016","unstructured":"Souza AD, Rajagopal K, Ankolekar VH, Souza ASD. 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