{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T10:02:54Z","timestamp":1789552974637,"version":"build-2803163510"},"reference-count":28,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T00:00:00Z","timestamp":1789516800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T00:00:00Z","timestamp":1789516800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Int Endodontic J"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Aim<\/jats:title>\n                    <jats:p>The primary aim of this study was to evaluate whether the volume of residual coronal tooth structure influences the survival of root canal\u2010retreated posterior teeth with up to 10\u2010year follow\u2010up. Secondary aims were to assess whether 12\u2010month radiographic findings and the Dental Practicality Index (DPI) could predict long\u2010term survival.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methodology<\/jats:title>\n                    <jats:p>A total of 156 posterior teeth in 140 patients underwent clinical examination, baseline CBCT and PA prior to retreatment in a postgraduate endodontic unit under specialist supervision. Residual coronal tooth volume was quantified using intraoral scans following the completion of root canal retreatment and before core build\u2010up and placement of metal\u2013ceramic crowns. The metal\u2013ceramic crowns were cemented using RelyX Luting Plus (3\u2009M ESPE, St. Paul, MN, USA). Follow\u2010up assessments were conducted at 12, 24, 36, 48, and 120\u2009months (T12\u2013T120). Periapical radiograph (PA) and cone beam computed tomography (CBCT) were obtained at T12, with additional periapical imaging at T48. Outcomes were categorized as \u2018survived\u2019 or \u2018extracted\u2019. The optimal cut\u2010off value for residual volume was identified using receiver operating characteristic (ROC) analysis and Youden's index. Associations between survival and clinical variables were analysed.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The 10\u2010year recall rate was 66.4%, with a Kaplan\u2013Meier estimated 10\u2010year cumulative survival of 85.4%. The optimal threshold for residual tooth volume was 41%, with 58 teeth (40.8%) below this threshold and 84 (59.2%) at or above it. Teeth with &lt;\u200941% volume had an extraction rate more than three times higher than those with \u2265\u200941% (20.7% vs. 5.9%;\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.016). Teeth with an unfavourable 12\u2010month CBCT result had a 4.5\u2010fold increased risk of extraction compared to those with favourable outcomes (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.004). DPI scores were not significantly associated with extraction risk (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.67).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Root canal\u2010retreated posterior teeth demonstrated favourable long\u2010term survival. A residual coronal tooth volume\u2009\u2265\u200941% was strongly associated with improved survival. In addition, favourable PA and CBCT findings at 12\u2009months were associated with improved long\u2010term outcomes. These findings support root canal retreatment as a reliable and biologically favourable treatment option for posterior teeth with persistent apical periodontitis.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/iej.70273","type":"journal-article","created":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T09:09:20Z","timestamp":1789549760000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Prospective Study on the Effect of Coronal Tooth Structure Loss on the Survival of Root Canal\u2010Retreated Posterior Teeth Restored With Metal Ceramic Crowns With up to 10\u2010Year Follow\u2010Up"],"prefix":"10.1111","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8748-062X","authenticated-orcid":false,"given":"Nassr","family":"Al\u2010Nuaimi","sequence":"first","affiliation":[{"name":"Tufts University School of Dental Medicine  Boston Massachusetts USA"},{"name":"College of Dentistry, University of Baghdad  Baghdad Iraq"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3727-1915","authenticated-orcid":false,"given":"Lucy","family":"Powrie","sequence":"additional","affiliation":[{"name":"Faculty of Dentistry, Oral &amp; Craniofacial Sciences King's College London  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6827-4951","authenticated-orcid":false,"given":"Stefan","family":"Ciapryna","sequence":"additional","affiliation":[{"name":"Eastman Dental Institute, University College London  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0614-6951","authenticated-orcid":false,"given":"Shanon","family":"Patel","sequence":"additional","affiliation":[{"name":"Faculty of Dentistry, Oral &amp; Craniofacial Sciences King's College London  London UK"},{"name":"Guy's &amp; St Thomas NHS Foundation Trust  London UK"},{"name":"Private Practice  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0560-1054","authenticated-orcid":false,"given":"Francesco","family":"Mannocci","sequence":"additional","affiliation":[{"name":"Faculty of Dentistry, Oral &amp; Craniofacial Sciences King's College London  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,16]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.prosdent.2023.12.002"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/iej.13322"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/iej.12760"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.11607\/prd.3519"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joen.2009.09.001"},{"key":"e_1_2_9_7_1","doi-asserted-by":"crossref","first-page":"90","DOI":"10.1111\/j.1752-7325.2005.tb02792.x","article-title":"Root Canal Filled Versus Non\u2010Root Canal Filled Teeth: A Retrospective Comparison of Survival Times","volume":"65","author":"Caplan D. 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