{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T23:31:03Z","timestamp":1789601463137,"version":"build-2803163510"},"reference-count":47,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2025,1,13]],"date-time":"2025-01-13T00:00:00Z","timestamp":1736726400000},"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":[[2025,2]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>This study aimed to assess the proportions of complicated endodontic cases treated by undergraduate dental students in a University clinic now and in the past.<\/jats:p><\/jats:sec><jats:sec><jats:title>Material and Methods<\/jats:title><jats:p>Data were obtained from the electronic records and previous publications from the Faculty of Dentistry, University of Oslo, Norway. The operators were dental undergraduate students in their final 2 years of training. Proportions of tooth types, diagnosis, and retreatments were studied.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The amount of endodontically treated molars increased from 18% in 1971% to 44% in 2019. The number of teeth with preoperative apical periodontitis increased from 31% to 46%, and retreatments from 9% to 15%. The changes were highly significant, with the greatest change occurring from 1984 to 2009.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Undergraduate students are exposed to more complicated teeth now than 50 years ago.<\/jats:p><\/jats:sec>","DOI":"10.1002\/cre2.70071","type":"journal-article","created":{"date-parts":[[2025,1,13]],"date-time":"2025-01-13T12:33:40Z","timestamp":1736771620000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Changes in the Difficulty of Endodontic Cases Treated by Undergraduate Students at a University Clinic Between 1971 and 2019"],"prefix":"10.1002","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6012-297X","authenticated-orcid":false,"given":"Pia Titterud","family":"Sunde","sequence":"first","affiliation":[{"name":"Department of Endodontics, Faculty of Dentistry University of Oslo  Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Erling","family":"Skallevold","sequence":"additional","affiliation":[{"name":"Department of Endodontics, Faculty of Dentistry University of Oslo  Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Manpreet","family":"Kaur","sequence":"additional","affiliation":[{"name":"Department of Endodontics, Faculty of Dentistry University of Oslo  Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dag Solmund","family":"\u00d8rstavik","sequence":"additional","affiliation":[{"name":"Department of Endodontics, Faculty of Dentistry University of Oslo  Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,1,13]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.identj.2022.01.001"},{"issue":"1","key":"e_1_2_10_3_1","first-page":"31","article-title":"Influence of Method of Teaching Endodontics on the Self\u2010Efficacy and Self\u2010Perceived Competence of Undergraduate Dental Students","volume":"3","author":"Baaij A.","year":"2018","journal-title":"European Endodontic Journal"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/iej.13218"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/iej.13626"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0099-2399(80)80071-9"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joen.2006.09.006"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2591.2006.01149.x"},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2591.2004.00879.x"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.1097\/01.DON.0000125317.21892.8F"},{"key":"e_1_2_10_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0099-2399(06)81366-X"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.1111\/iej.12675"},{"key":"e_1_2_10_13_1","doi-asserted-by":"publisher","DOI":"10.1111\/eje.12130"},{"key":"e_1_2_10_14_1","doi-asserted-by":"publisher","DOI":"10.1186\/s12903-022-02406-9"},{"key":"e_1_2_10_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joen.2015.11.008"},{"key":"e_1_2_10_16_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2591.2008.01457.x"},{"key":"e_1_2_10_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/0030-4220(64)90510-9"},{"key":"e_1_2_10_18_1","doi-asserted-by":"publisher","DOI":"10.1111\/eje.12592"},{"key":"e_1_2_10_19_1","doi-asserted-by":"publisher","DOI":"10.1002\/j.0022-0337.1997.61.6.tb03138.x"},{"key":"e_1_2_10_20_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0579.2010.00646.x"},{"issue":"6","key":"e_1_2_10_21_1","first-page":"243","article-title":"Oral Health of Individuals Aged 3\u201080 Years in J\u00f6nk\u00f6ping, Sweden in 1973, 1983, and 1993. 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