{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,15]],"date-time":"2026-06-15T23:31:24Z","timestamp":1781566284996,"version":"3.54.5"},"reference-count":16,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2024,5,26]],"date-time":"2024-05-26T00:00:00Z","timestamp":1716681600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Clinical &amp;amp; Exp Dental Res"],"published-print":{"date-parts":[[2024,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>In conjunction with post placement in root\u2010filled teeth with periapical healthy conditions, root canal retreatment may be performed to improve the seal of the root canal. Whether root canal retreatment for technical reasons (retreatments in teeth without apical periodontitis (AP)) results in lower frequency of AP is unknown.<\/jats:p><\/jats:sec><jats:sec><jats:title>Objective<\/jats:title><jats:p>To examine whether there is a difference in frequency of AP between roots with root canals retreated for technical reasons, and roots with root canals not retreated before post placement, with a minimum follow\u2010up of 5 years. Also, to examine changes in root filling quality following root canal retreatment for technical reasons.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>This retrospective study included radiographs of 441 root\u2010filled roots without periapical radiolucencies at baseline, scheduled for post and core treatment. Follow\u2010up data for a minimum of 5 years were available for 305 roots (loss to follow\u2010up 30.8%), 46 of which were retreated for technical reasons. Two calibrated observers assessed root filling sealing quality and length, respectively, and periapical status according to the Periapical Index. The main outcome of the study, AP, was used as the dependent variable and all analyses were performed at root level.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The overall frequency of AP at follow\u2010up was 13.8%. The difference in frequency of AP between retreated (4.3%) and nonretreated (15.4%) root canals was not statistically significant, <jats:italic>p<\/jats:italic>\u2009=\u2009.061. Analyses including only roots with preoperatively inadequate root filling quality showed a statistically significant difference (<jats:italic>p<\/jats:italic>\u2009=\u2009.017) between the two treatment groups (2.4% <jats:italic>vs<\/jats:italic>. 22.9%).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Root canal retreatment for technical reasons before post and core placement significantly reduces the frequency of AP in roots with inadequate root filling quality.<\/jats:p><\/jats:sec>","DOI":"10.1002\/cre2.881","type":"journal-article","created":{"date-parts":[[2024,5,27]],"date-time":"2024-05-27T06:03:32Z","timestamp":1716789812000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Frequency of apical periodontitis in root\u2010filled teeth restored with post and core: A 5\u2010year retrospective study"],"prefix":"10.1002","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-1692-0038","authenticated-orcid":false,"given":"Louise","family":"Johansson","sequence":"first","affiliation":[{"name":"Dental Research Department \u00d6rebro University \u00d6rebro Sweden"},{"name":"Specialist Clinic of Endodontology Public Dental Health Service Region \u00d6rebro County Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jakob Jonsson","family":"Sj\u00f6gren","sequence":"additional","affiliation":[{"name":"Dental Research Department \u00d6rebro University \u00d6rebro Sweden"},{"name":"Department of Endodontics Malm\u00f6 University Malm\u00f6 Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anders","family":"Wir\u00e9n","sequence":"additional","affiliation":[{"name":"Clinical Epidemiology and Biostatistics \u00d6rebro University \u00d6rebro 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