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Five root morphologies were modelled: separated\u2010rooted (S), fused\u2010rooted with V\u2010shaped (F\u2010V), U\u2010shaped (F\u2010U) or \u03a9\u2010shaped (F\u2010\u03a9) radicular grooves and single\u2010canal fused\u2010rooted (F\u2010O). Micro\u2010CT scans were performed before and after endodontic instrumentation to generate the finite element models: intact teeth, post\u2010and\u2010core crowns with 2\u2010 to 3\u2010mm ferrules and endocrowns with 3\u2010 to 4\u2010mm pulp chamber extensions. Under axial\/oblique loading, von Mises stress distribution was evaluated. Results showed endocrowns had lower peak stresses than post\u2010and\u2010core crowns in common anatomical variations (S, F\u2010U, F\u2010\u03a9); F\u2010V showed comparable peak stresses; post\u2010and\u2010core crowns with sufficient ferrule height minimised oblique\u2010load stresses in single\u2010canal teeth (F\u2010O). Pronounced stress concentrations were observed at \u03a9\u2010shaped groove in post\u2010and\u2010core restored teeth. Comprehensive evaluation of root morphology is critical for optimal restoration planning.<\/jats:p>","DOI":"10.1111\/aej.70019","type":"journal-article","created":{"date-parts":[[2025,9,10]],"date-time":"2025-09-10T11:56:03Z","timestamp":1757505363000},"page":"24-34","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Finite Element Analysis of Endodontically Treated Mandibular Second Molars With Variable Root Morphologies: Endocrown vs. Post\u2010And\u2010Core Crown Restorations"],"prefix":"10.1111","volume":"52","author":[{"given":"Shenghao","family":"Qiu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Oral Diseases &amp; National Center for Stomatology &amp; National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics West China Hospital of Stomatology, Sichuan University  Chengdu Sichuan 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