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The subjects were categorized into three age groups (20\u201330, 30\u201340, and 40\u201350\u00a0years). When the maxillary sinus extended to the canine area, the vertical distance between them was measured, and their relationship was classified into three types: I (more than 2\u00a0mm distance), II (less than 2\u00a0mm distance or in-contact), and III (interlock).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>413 out of 600 maxillary sinuses (68.8%) were extended into the canine area or beyond. Among them, 15 maxillary sinuses pneumatized into the incisor area (2.5%). The prevalence of the maxillary sinuses extended to the anterior region of the jaw was not significantly different between genders. However, it was significantly less frequent in the older age group and more frequent on the left side. In addition, the mean amount of anterior extension of the maxillary sinus (mm) was significantly lower in the older age group. Type I was the most frequent vertical relationship between the maxillary sinuses and canine apices with no significant difference in gender, side, and age groups.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>In most cases, the maxillary sinus extended to the canine area and sometimes reached the incisor region. This necessitates paying more attention to the maxillary anterior sextant during surgical procedures.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12903-021-01700-2","type":"journal-article","created":{"date-parts":[[2021,7,10]],"date-time":"2021-07-10T02:03:16Z","timestamp":1625882596000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Assessment of the relationship between the maxillary sinus and the canine root tip using cone beam computed tomography"],"prefix":"10.1186","volume":"21","author":[{"given":"Leila","family":"Khojastepour","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Najmeh","family":"Movahhedian","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohadeseh","family":"Zolghadrpour","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohammad","family":"Mahjoori-Ghasrodashti","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,7,10]]},"reference":[{"key":"1700_CR1","doi-asserted-by":"publisher","first-page":"429","DOI":"10.1016\/j.otohns.2004.11.012","volume":"132","author":"B-C Jun","year":"2005","unstructured":"Jun B-C, Song S-W, Park C-S, Lee D-H, Cho K-J, Cho J-H. 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The form will surely be available upon the journal requirement.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to participate"}},{"value":"The authors declare that they have no conflict of interest.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"338"}}