{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,1]],"date-time":"2026-08-01T06:59:20Z","timestamp":1785567560832,"version":"3.56.0"},"reference-count":21,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T00:00:00Z","timestamp":1785456000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T00:00:00Z","timestamp":1785456000000},"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":["Aust Endodontic J"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    This study evaluated angular and linear positional changes of the second mesiobuccal (MB2) canal orifice in maxillary first molars and proposed a guideline for its localization. Twenty\u2010eight extracted maxillary first molars with four canals were analysed. After access cavity preparation, all canals except MB2 were instrumented. The initial and final MB2 orifice positions were defined as MB2a and MB2b, respectively, following selective dentine removal and canal preparation. Standardized microscopic images were obtained, and the angle between the MB1\u2013MB2 and DB\u2013P lines, as well as inter\u2010orifice distances, were measured using paired\n                    <jats:italic>t<\/jats:italic>\n                    \u2010tests (\n                    <jats:italic>\u03b1<\/jats:italic>\n                    \u2009=\u20090.05). MB2 canals were identified in all specimens. The mean angle significantly changed from \u221221.84\u00b0\u2009\u00b1\u20098.87\u00b0 to +8.38\u00b0\u2009\u00b1\u20098.95\u00b0 (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.05), indicating a mesial shift and increased parallelism. Mean displacement was 1.07\u2009\u00b1\u20090.39\u2009mm. A DB\u2013P\u2010parallel direction may aid predictable MB2 localization in maxillary first molars.\n                  <\/jats:p>","DOI":"10.1111\/aej.70112","type":"journal-article","created":{"date-parts":[[2026,8,1]],"date-time":"2026-08-01T06:43:23Z","timestamp":1785566603000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Changes in the Location of the Second Mesiobuccal Canal Orifice After Canal Preparation in Maxillary First Molars"],"prefix":"10.1111","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3566-1821","authenticated-orcid":false,"given":"Hyoung\u2010Hoon","family":"Jo","sequence":"first","affiliation":[{"name":"Department of Conservative Dentistry, School of Dentistry Chosun University  Gwangju South 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USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3237-232X","authenticated-orcid":false,"given":"Ho\u2010Keel","family":"Hwang","sequence":"additional","affiliation":[{"name":"Department of Conservative Dentistry, School of Dentistry Chosun University  Gwangju South 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