{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,7]],"date-time":"2025-11-07T00:34:18Z","timestamp":1762475658747,"version":"build-2065373602"},"reference-count":20,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2019,5,21]],"date-time":"2019-05-21T00:00:00Z","timestamp":1558396800000},"content-version":"vor","delay-in-days":140,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Case Reports in Dentistry"],"published-print":{"date-parts":[[2019,1]]},"abstract":"<jats:p>The present communication describes the endodontic retreatment of a rare four\u2010rooted maxillary second molar. A 25\u2010year\u2010old patient was referred to our dental practice requesting an apicoectomy because of continuous and permanent pain reaction six months after the first endodontic treatment. The sent radiograph demonstrated three filled root canals (one mesial, two distal) and four radiographically superimposing roots (two mesial, two distal). Due to the diagnosed chronic apical periodontitis and based on the visible untreated root canal, we decided to endodontically re\u2010treat the quadrangular tooth against the referred apicoectomy. In the first session, only the previously untreated mesiopalatal root canal was mechanically prepared and filled with a corticosteroid\u2010 and tetracycline\u2010containing paste. After two symptom\u2010free weeks, the gutta\u2010percha was removed from the other canals and calcium hydroxide was applied. Another two weeks later, the four root canals, whose orifices were \u201cirregular quadrilateral\u201d shaped on the pulp chamber floor representing Versiani Type A, were obturated. After the verification of this rare anatomy by cone beam computed tomography, the tooth was classified as Christie\u2019s radicular type II. One characteristic of this type is parallel running buccal and palatal roots, which caused a radiographic superimposition and probably led to the endodontic mistreatment in the first case.<\/jats:p>","DOI":"10.1155\/2019\/5348048","type":"journal-article","created":{"date-parts":[[2019,5,21]],"date-time":"2019-05-21T19:53:35Z","timestamp":1558468415000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Endodontic Retreatment of Maxillary Second Molar with Four Roots"],"prefix":"10.1155","volume":"2019","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7857-7518","authenticated-orcid":false,"given":"Gabriel","family":"Magnucki","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2019,5,21]]},"reference":[{"key":"e_1_2_7_1_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0099-2399(89)80134-7"},{"key":"e_1_2_7_2_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2591.1996.tb01399.x"},{"key":"e_1_2_7_3_2","doi-asserted-by":"publisher","DOI":"10.3290\/j.qi.a39508"},{"key":"e_1_2_7_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0099-2399(06)81613-4"},{"key":"e_1_2_7_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.joen.2012.03.026"},{"key":"e_1_2_7_6_2","doi-asserted-by":"publisher","DOI":"10.1080\/000163500750051782"},{"key":"e_1_2_7_7_2","doi-asserted-by":"publisher","DOI":"10.1080\/000163599428715"},{"key":"e_1_2_7_8_2","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-2591.2002.00559.x"},{"key":"e_1_2_7_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.joen.2017.08.020"},{"key":"e_1_2_7_10_2","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0165329"},{"key":"e_1_2_7_11_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.joen.2013.09.012"},{"key":"e_1_2_7_12_2","doi-asserted-by":"publisher","DOI":"10.2174\/1874210601509010267"},{"key":"e_1_2_7_13_2","doi-asserted-by":"publisher","DOI":"10.1080\/13102818.2015.1092885"},{"key":"e_1_2_7_14_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.joen.2012.04.025"},{"key":"e_1_2_7_15_2","first-page":"7030","article-title":"Evaluation of root and canal morphology of maxillary molars in a Southern Chinese subpopulation: a cone-beam computed tomographic study","volume":"10","author":"Wang H.","year":"2017","journal-title":"International Journal of Clinical and Experimental Medicine"},{"key":"e_1_2_7_16_2","first-page":"958","article-title":"Cone-beam computed tomography was used for study of root and canal morphology of maxillary first and second molars","volume":"46","author":"Jing Y. 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