{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T21:04:47Z","timestamp":1760043887354,"version":"3.44.0"},"reference-count":28,"publisher":"BMJ","issue":"9","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2023,8,18]]},"published-print":{"date-parts":[[2023,9]]},"abstract":"<jats:p>The present case describes the successful healing of a periapical lesion associated with the left maxillary lateral incisor (# 22, Federation Dentaire Internationale) having a type 3b dens invaginatus tooth morphology. The treatment was complicated by the presence of blunderbuss root apex and large periapical lesion (&gt;10\u2009mm) with through and through bone defect (Bucco palatal cortical bone perforation, Von Arx Type 1b). An adolescent boy reported palatal swelling and pus discharge in relation to tooth #22. A thorough clinical and radiographic examination revealed tooth #22 as having a type 3b dens invaginatus with an open apex and a diagnosis of pulp necrosis and acute apical abscess. The case was managed by non-surgical root canal treatment followed by endodontic surgery using principles of guided tissue regeneration. A 5-year recall revealed an asymptomatic functional tooth with complete healing.<\/jats:p>","DOI":"10.1136\/bcr-2023-255546","type":"journal-article","created":{"date-parts":[[2023,9,27]],"date-time":"2023-09-27T22:46:41Z","timestamp":1695854801000},"page":"e255546","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":3,"title":["Combined surgical and conservative endodontic management of Oehler\u2019s type 3b dens invaginatus aided by guided tissue regeneration"],"prefix":"10.1136","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1632-1592","authenticated-orcid":false,"given":"Sarah","family":"Ahmad","sequence":"first","affiliation":[{"name":"Conservative Dentistry and Endodontics, Dr Z.A Dental College, Faculty of Medicine, Aligarh Muslim University, Aligarh, 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