{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,13]],"date-time":"2026-09-13T05:04:41Z","timestamp":1789275881621,"version":"build-2803163510"},"reference-count":40,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2026,9,11]],"date-time":"2026-09-11T00:00:00Z","timestamp":1789084800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002383","name":"King Saud University","doi-asserted-by":"crossref","award":["ORF-2026-1419"],"award-info":[{"award-number":["ORF-2026-1419"]}],"id":[{"id":"10.13039\/501100002383","id-type":"DOI","asserted-by":"crossref"}]},{"award":["ORF-2026-1419"],"award-info":[{"award-number":["ORF-2026-1419"]}],"id":[{"id":"https:\/\/ror.org\/02f81g417","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Bioengineering"],"abstract":"<jats:p>Background: The purpose of this in vitro study was to evaluate the fracture resistance of maxillary molar zirconia crowns cemented with deep margins relocated with resin composite. Methods: A maxillary right first-molar typodont tooth was prepared for a complete-coverage zirconia crown and modified to have: (1-DME) a 3 mm deep and 3 mm wide box on the mesial margin; (2-DME) 3 mm deep and 3 mm wide boxes on both the mesial and distal margins; and (N-DME) no box modification. Before the first modification, 45 zirconia (4 mol% yttria) crowns were fabricated. The die was scanned before each modification to fabricate the corresponding 3D-printed dies (n = 15 per group). The DME boxes were restored with universal resin composite, and the crowns were then cemented to their respective dies using a resin luting cement. Then artificial aging was performed by thermocycling for 10,000 cycles between 5 \u00b0C and 55 \u00b0C with a dwell time of 30 s. The cemented crowns were then loaded to failure in a universal testing machine. Maximum fracture load was analyzed with one-way ANOVA and the post hoc Tukey HSD test (\u03b1 = 0.05). In addition, fracture patterns were evaluated descriptively with scanning electron microscopy images. Results: The fracture resistance of maxillary molar zirconia crowns differed significantly among the groups. Group 2-DME demonstrated the highest mean fracture resistance (5370 N), followed by Group 1-DME (5083 N). The lowest mean value was recorded for the control group, N-DME (2961 N). Conclusions: Zirconia crowns cemented on teeth with deep margin elevation exhibited higher fracture resistance than crowns cemented without deep margin elevation.<\/jats:p>","DOI":"10.3390\/bioengineering13091057","type":"journal-article","created":{"date-parts":[[2026,9,11]],"date-time":"2026-09-11T08:17:42Z","timestamp":1789114662000},"page":"1057","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Effect of Deep Margin Elevation on the Fracture Resistance of Maxillary Molar Zirconia Crowns"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-3245-5245","authenticated-orcid":false,"given":"Silvia","family":"Rojas-Rueda","sequence":"first","affiliation":[{"name":"School of Dental Medicine, Ponce Health Sciences University, Ponce 00716, Puerto Rico"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7775-8325","authenticated-orcid":false,"given":"Domingo Santos","family":"Pantaleon","sequence":"additional","affiliation":[{"name":"Health Research Institute, Faculty Health Sciences, Autonomous of University of Santo Domingo, Santo Domingo 10105, Dominican Republic"},{"name":"Institute for Dental Education and Research, San Francisco de Macor\u00eds 31000, Dominican Republic"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"software","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"},{"role":"project-administration","vocabulary":"credit"}]},{"given":"Brian R.","family":"Morrow","sequence":"additional","affiliation":[{"name":"Department of Bioscience Research, College of Dentistry, The University of Tennessee Health Science Center, Memphis, TN 38163, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8133-3306","authenticated-orcid":false,"given":"Franklin","family":"Garcia-Godoy","sequence":"additional","affiliation":[{"name":"Department of Bioscience Research, College of Dentistry, The University of Tennessee Health Science Center, Memphis, TN 38163, USA"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7437-4855","authenticated-orcid":false,"given":"Carlos A.","family":"Jurado","sequence":"additional","affiliation":[{"name":"School of Dental Medicine, Ponce Health Sciences University, Ponce 00716, Puerto Rico"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0598-9842","authenticated-orcid":false,"given":"Damian","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Prosthodontics, School of Dental Medicine, Tufts University, Boston, MA 02111, USA"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"software","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"project-administration","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8890-8707","authenticated-orcid":false,"given":"Abdulrahman","family":"Alshabib","sequence":"additional","affiliation":[{"name":"Department of Restorative Dental Science, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"validation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4109-9356","authenticated-orcid":false,"given":"Mark A.","family":"Antal","sequence":"additional","affiliation":[{"name":"Department of Operative and Esthetic Dentistry, Faculty of Dentistry, University of Szeged, 6720 Szeged, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"55","DOI":"10.1034\/j.1600-051X.29.s3.3.x","article-title":"A systematic review on the clinical efficacy of subgingival debridement in the treatment of chronic periodontitis","volume":"29","author":"Timmerman","year":"2002","journal-title":"J. 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