{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T13:32:49Z","timestamp":1790861569148,"version":"4.1.0"},"reference-count":39,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2015,4,28]],"date-time":"2015-04-28T00:00:00Z","timestamp":1430179200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Int Endodontic J"],"published-print":{"date-parts":[[2016,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Aim<\/jats:title><jats:p>To evaluate the association between apical patency and post\u2010operative pain in posterior teeth with pulp necrosis and apical periodontitis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methodology<\/jats:title><jats:p>Sixty\u2010eight patients requiring primary root canal treatment in mandibular first molars with necrotic pulps and apical periodontitis were included. The patients were randomly allocated to one of two groups: patency (<jats:italic>n<\/jats:italic>\u00a0=\u00a034) and nonpatency (<jats:italic>n<\/jats:italic>\u00a0=\u00a034). After administering local anaesthesia, root canal preparation was completed using ProTaper rotary instruments. A size 10\u00a0K\u2010file was used as a patency file and carried 1\u00a0mm beyond the working length (<jats:styled-content style=\"fixed-case\">WL<\/jats:styled-content>) between each instrument change in the patency group, while it was carried up to <jats:styled-content style=\"fixed-case\">WL<\/jats:styled-content> in the nonpatency group. Patients were asked to record their pain experience on a pain chart daily for 7\u00a0days. Three patients (two in the patency group, one in the nonpatency group) did not return with completed pain charts on the subsequent visit, resulting in a total of 65 patients for the final analysis (patency, <jats:italic>n<\/jats:italic>\u00a0=\u00a032; nonpatency, <jats:italic>n<\/jats:italic>\u00a0=\u00a033). Data was analysed using Chi Square test, <jats:italic>t<\/jats:italic>\u2010test, Mann\u2013Whitney test and Wilcoxon Signed Ranks test.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Overall, 43% of the patients experienced post\u2010operative pain. The patency group had less incidence of pain (34%) as compared to the nonpatency group (52%), but the difference was not significant (<jats:italic>P<\/jats:italic>\u00a0=\u00a00.163).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Maintenance of apical patency during chemomechanical preparation had no significant influence on post\u2010operative pain in posterior teeth with necrotic pulps and apical periodontitis.<\/jats:p><\/jats:sec>","DOI":"10.1111\/iej.12457","type":"journal-article","created":{"date-parts":[[2015,4,13]],"date-time":"2015-04-13T07:42:22Z","timestamp":1428910942000},"page":"317-324","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Effect of maintaining apical patency on endodontic pain in posterior teeth with pulp necrosis and apical periodontitis: a randomized controlled 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