{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,20]],"date-time":"2026-09-20T01:46:48Z","timestamp":1789868808055,"version":"4.0.1"},"reference-count":23,"publisher":"Wiley","issue":"7","license":[{"start":{"date-parts":[[2015,7,20]],"date-time":"2015-07-20T00:00:00Z","timestamp":1437350400000},"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":[[2016,7]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Aim<\/jats:title><jats:p>To study the 20\u2010year survival rate and periapical status of root filled teeth in a Swedish population requiring high\u2010cost dental care and to identify factors related to survival and normal periapical status at follow\u2010up.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methodology<\/jats:title><jats:p>The study population comprised 104 patients selected from four local health insurance districts with treatment plans including radiographs submitted for approval for reimbursement from the Swedish National Dental Insurance in 1977. In 1998, a clinical and radiographic follow\u2010up examination was conducted, to register the status of 449 teeth identified as root filled at baseline. Differences in tooth survival and periapical status at follow\u2010up, with reference to periapical status and quality of root filling at baseline, were analysed by chi\u2010square tests. Multiple regression analysis was used to describe tooth survival and normal periapical status at follow\u2010up, with the explanatory baseline variables: tooth type, type of restoration, type of post, quality of root filling, periapical status, marginal bone loss and caries. Differences were considered significant at a 5% level.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Two hundred and ninety (65%) of the root filled teeth survived at follow\u2010up. Baseline variables associated with low odds for tooth survival were mandibular molar, maxillary premolar, prefabricated posts other than screw posts, severe marginal bone loss, caries and apical periodontitis (<jats:styled-content style=\"fixed-case\">AP<\/jats:styled-content>). Normal periapical status at follow\u2010up was registered in 49% of the root filled teeth. Baseline variables associated with low odds for normal periapical status (high risk for <jats:styled-content style=\"fixed-case\">AP<\/jats:styled-content>) at follow\u2010up were mandibular molar, maxillary premolar, <jats:styled-content style=\"fixed-case\">AP<\/jats:styled-content>, severe marginal bone loss and inadequate root filling quality. Of the root filled teeth with <jats:styled-content style=\"fixed-case\">AP<\/jats:styled-content> at baseline, 42% had been left untreated during the observation period, and at follow\u2010up, the <jats:styled-content style=\"fixed-case\">AP<\/jats:styled-content> persisted in 57% of these teeth.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>After 20\u00a0years, 65% of the root filled teeth had survived and one\u2010third remained with a sound periapical condition, without any further treatment. Almost half of the <jats:styled-content style=\"fixed-case\">AP<\/jats:styled-content>s registered at baseline were left without treatment, and more than half of them persisted after 20\u00a0years.<\/jats:p><\/jats:sec>","DOI":"10.1111\/iej.12495","type":"journal-article","created":{"date-parts":[[2015,7,3]],"date-time":"2015-07-03T16:10:34Z","timestamp":1435939834000},"page":"636-645","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Twenty\u2010year follow\u2010up of root filled teeth in a <scp>S<\/scp>wedish population receiving high\u2010cost dental care"],"prefix":"10.1111","volume":"49","author":[{"given":"K.","family":"Petersson","sequence":"first","affiliation":[{"name":"Department of Endodontics Faculty of Odontology Malm\u00f6 University Malm\u00f6 Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4290-2283","authenticated-orcid":false,"given":"H.","family":"Fransson","sequence":"additional","affiliation":[{"name":"Department of Endodontics Faculty of Odontology Malm\u00f6 University Malm\u00f6 Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"E.","family":"Wolf","sequence":"additional","affiliation":[{"name":"Department of Endodontics Faculty of Odontology Malm\u00f6 University Malm\u00f6 Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.","family":"H\u00e5kansson","sequence":"additional","affiliation":[{"name":"Department of Periodontology Institute of Odontology University of Gothenburg Gothenburg Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2015,7,20]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/iej.12138"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1177\/154405910608501104"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-2591.2003.00639.x"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joen.2013.10.026"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2591.2007.01290.x"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1080\/00016350310005510"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joen.2013.06.014"},{"key":"e_1_2_6_9_1","first-page":"101","article-title":"The influence of observer performance in radiographic caries diagnosis","volume":"3","author":"Gr\u00f6ndahl HG","year":"1979","journal-title":"Swedish Dental Journal"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1034\/j.1600-051X.2001.280807.x"},{"key":"e_1_2_6_11_1","first-page":"21","article-title":"Marginal bone loss and tooth loss in a sample from the County of Stockholm \u2013 a longitudinal study over 20\u00a0years","volume":"26","author":"Jansson L","year":"2002","journal-title":"Swedish Dental Journal"},{"key":"e_1_2_6_12_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2591.2012.02040.x"},{"key":"e_1_2_6_13_1","doi-asserted-by":"publisher","DOI":"10.1111\/iej.12367"},{"key":"e_1_2_6_14_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2591.2009.01671.x"},{"key":"e_1_2_6_15_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2591.2011.01873.x"},{"key":"e_1_2_6_16_1","doi-asserted-by":"publisher","DOI":"10.1034\/j.1600-051X.1999.260908.x"},{"key":"e_1_2_6_17_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0722.2004.00122.x"},{"key":"e_1_2_6_18_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00784-013-1156-3"},{"key":"e_1_2_6_19_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-9657.1989.tb00352.x"},{"key":"e_1_2_6_20_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-9657.1991.tb00440.x"},{"key":"e_1_2_6_21_1","first-page":"77","article-title":"20\u2010year follow\u2010up of patients receiving high\u2010cost dental care within the Swedish Dental Insurance System: 1977\u20131978 to 1998\u20132000","volume":"30","author":"Petersson K","year":"2006","journal-title":"Swedish Dental Journal"},{"key":"e_1_2_6_22_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joen.2013.06.028"},{"key":"e_1_2_6_23_1","unstructured":"Swedish Council on Health Technology Assessment(2010)Rotfyllning\u2013en systematisk litteratur\u00f6versikt(In Swedish) Swedish Council on Health Technology Assessment. Report 203 2010. English translation Methods of diagnosis and treatment in endodontics. 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