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All teeth received a standardized simulated crown-root fracture, selective enamel etching followed by universal adhesive application, resin-based composite (RBC) build-up (conventional or bulk-fill), root canal treatment, and glass fiber post placement. Crown preparations were performed either entirely in natural tooth structure with subgingival finish lines (DME absent) or partially on the RBC build-up, yielding supragingival finish lines (DME present). Marginal integrity was assessed microscopically at baseline, after initial thermomechanical loading (TML), and after extended TML. Fracture resistance was determined by load-to-fracture testing. Statistical analyses included Kruskal-Wallis, Dunn\u2019s post hoc, and Fisher\u2019s exact tests (\n                      <jats:italic>\u03b1<\/jats:italic>\n                      \u2009=\u20090.05).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Median marginal continuity remained 100% across all groups. Fracture resistance (1,305-1,595\u00a0N) showed no significant differences between groups. Fractures during TML occurred exclusively in groups without DME.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Within the limitations of this in vitro study, DME did not adversely affect marginal integrity or fracture resistance of restored anterior teeth. In contrast to non-DME groups, specimens with DME did not exhibit failures during TML.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Clinical relevance<\/jats:title>\n                    <jats:p>DME restorations can maintain high marginal integrity and load-bearing capacity in anterior teeth with crown-root fractures. These findings provide preliminary evidence supporting DME as a conservative approach for managing anterior crown-root fractures in select cases, with confirmation needed from clinical studies.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00784-026-06810-1","type":"journal-article","created":{"date-parts":[[2026,3,28]],"date-time":"2026-03-28T03:46:13Z","timestamp":1774669573000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Deep margin elevation in permanent incisors with crown-root fractures: A laboratory study"],"prefix":"10.1007","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-6488-7442","authenticated-orcid":false,"given":"Laurent","family":"Liechti","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-6565-2451","authenticated-orcid":false,"given":"Hauke","family":"Hildebrand","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8228-6545","authenticated-orcid":false,"given":"Nicola U.","family":"Zitzmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6341-7047","authenticated-orcid":false,"given":"Markus B.","family":"Blatz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-0468-6639","authenticated-orcid":false,"given":"Roland","family":"Weiger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9402-8121","authenticated-orcid":false,"given":"Gabriel","family":"Krastl","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4461-5835","authenticated-orcid":false,"given":"Thomas","family":"Connert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2320-9259","authenticated-orcid":false,"given":"Andreas","family":"Filippi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6185-1480","authenticated-orcid":false,"given":"Florin","family":"Eggmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,3,28]]},"reference":[{"issue":"4","key":"6810_CR23","doi-asserted-by":"publisher","first-page":"249","DOI":"10.1046\/j.1365-263X.2001.00277.x","volume":"11","author":"MK Borum","year":"2001","unstructured":"Borum MK, Andreasen JO (2001) Therapeutic and economic implications of traumatic dental injuries in Denmark: an estimate based on 7549 patients treated at a major trauma centre. 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