{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T19:20:34Z","timestamp":1791314434986,"version":"4.3.1"},"reference-count":31,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2022,3,22]],"date-time":"2022-03-22T00:00:00Z","timestamp":1647907200000},"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":[[2022,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Aim<\/jats:title><jats:p>To assess long\u2010term external cervical resorption (ECR) treatment outcomes in relation to both local and treatment\u2010related determinants.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methodology<\/jats:title><jats:p>Information was available for 76 patients (98 teeth) who were diagnosed with ECR during the period from 2008 to 2018 at the University of British Columbia graduate endodontics clinic. The ECR patients were followed up, and a clinical and radiographic examination was conducted. Chi\u2010square test compared failure rates amongst different subgroups. The survival analysis was used to evaluate the overall ECR survival\/failure rates in relation to several local and treatment\u2010related determinants.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Overall, 67 patients (89 teeth) were followed up. The mean follow\u2010up time was 3.9\u00a0years, and the minimum was 1\u00a0year. Twenty\u2010four teeth failed (19 extracted, 5 not functional), and the overall probability of failure was 50.0% 8\u00a0years after the diagnosis. Significant (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a0.05) local ECR determinants were tooth location and the Heithersay classification, and treatment\u2010related determinants were root canal treatment (RCT) and the ECR repair combined with RCT. Treatment outcomes for Heithersay class 1 and 2 cases were better than for class 3 and 4 cases.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Higher failure rates were associated with posterior tooth location and higher Heithersay class, whilst RCT and ECR repair combined with RCT were associated with lower failure rates.<\/jats:p><\/jats:sec>","DOI":"10.1111\/iej.13717","type":"journal-article","created":{"date-parts":[[2022,3,4]],"date-time":"2022-03-04T09:06:37Z","timestamp":1646384797000},"page":"441-452","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["External cervical resorption \u2013 Treatment outcomes and determinants: A retrospective cohort study with up to 10\u00a0years of follow\u2010up"],"prefix":"10.1111","volume":"55","author":[{"given":"Eleni","family":"Irinakis","sequence":"first","affiliation":[{"name":"Department of Oral Biological and Medical Sciences The 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