{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,11]],"date-time":"2026-09-11T19:27:11Z","timestamp":1789154831738,"version":"build-2803163510"},"reference-count":41,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2025,10,18]],"date-time":"2025-10-18T00:00:00Z","timestamp":1760745600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2025,10,18]],"date-time":"2025-10-18T00:00:00Z","timestamp":1760745600000},"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":["Journal of Prosthodontics"],"published-print":{"date-parts":[[2026,3]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>This in vitro study aimed to evaluate and compare the fracture resistance of zirconia mandibular molar crowns with the traditional trapezoidal (TT) shaped access and three novel conservative access designs. The designs tested were the TT, conservative trapezoidal (CT), ultraconservative circular (UC), and two conservative single accesses (TC).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Materials and Methods<\/jats:title>\n                    <jats:p>A mandibular right first molar typodont tooth was prepared for a full coverage zirconia crown. The preparation was scanned, and a total of 56 monolithic zirconia crowns were milled. Resin dies were printed for each restoration. Crowns were cemented with dual curing resin cement to the printed dies. The specimens were artificially aged with 10,000 thermal cycles between 5\u00b0C and 55\u00b0C with a dwell time of 30 s and were loaded to failure using a universal testing machine. Furthermore, scanning electron microscope (SEM) images were taken to evaluate the fracture patterns of the specimens. The fracture load was analyzed using the Shapiro\u2010Wilks normality test, followed by a one\u2010way ANOVA with a post hoc Tukey test.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The fracture resistance of mandibular molar zirconia crowns significantly varied according to the endodontic access cavity design. Crowns with UC access had the highest fracture resistance (2722 \u00b1 113 N,\n                      <jats:italic>p<\/jats:italic>\n                      &lt; 0.001), followed by the CT (2469 \u00b1 126 N) and the TT access (1915 \u00b1 71 N). The two\u2010conservative single access design had the lowest value (1064 + 129 N).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>All endodontic access designs for mandibular molar zirconia crowns appeared to withstand the average occlusal forces. Crowns with UC access demonstrated the highest fracture resistance among different endodontic access designs. Two conservative single accesses in the same crowns significantly diminished the fracture resistance.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/jopr.70047","type":"journal-article","created":{"date-parts":[[2025,10,18]],"date-time":"2025-10-18T17:35:21Z","timestamp":1760808921000},"page":"390-396","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Impact of endodontic access design on the fracture resistance of zirconia mandibular molar crowns"],"prefix":"10.1111","volume":"35","author":[{"given":"Salahaldeen","family":"Abuhammoud","sequence":"first","affiliation":[{"name":"Department of Prosthodontics The University of Iowa College of Dentistry and Dental Clinics  Iowa City Iowa USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7437-4855","authenticated-orcid":false,"given":"Carlos A.","family":"Jurado","sequence":"additional","affiliation":[{"name":"Division of Operative Dentistry, Department of General Dentistry The University of Tennessee Health Science Center College of Dentistry  Memphis Tennessee USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-3245-5245","authenticated-orcid":false,"given":"Silvia","family":"Rojas\u2010Rueda","sequence":"additional","affiliation":[{"name":"Division of Dental Biomaterials The University of Alabama at Birmingham School of Dentistry  Birmingham Alabama USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3504-5519","authenticated-orcid":false,"given":"Rene","family":"Garcia\u2010Contreras","sequence":"additional","affiliation":[{"name":"Interdisciplinary Research Laboratory, Nanostructures and biomaterials Area, National School of Higher Studies (ENES) Leon National Autonomous University of Mexico (UNAM)  Leon Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel","family":"Vegh","sequence":"additional","affiliation":[{"name":"Department of Prosthodontics Semmelweis University Faculty of Dentistry  Budapest Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0598-9842","authenticated-orcid":false,"given":"Damian J.","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Prosthodontics Tufts University School of Dental Medicine  Boston Massachusetts USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,10,18]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.11607\/ijp.8171"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/jopr.13596"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/ccr3.5499"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jdent.2018.01.013"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jdent.2016.09.010"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.adaj.2020.10.012"},{"key":"e_1_2_6_8_1","unstructured":"HoC Arg\u00e1ezC.Endodontic therapy interventions for root canal failure in permanent dentition: a review of clinical effectiveness cost\u2010effectiveness and guidelines [Internet].Ottawa (ON):Canadian Agency for Drugs and Technologies in Health[2017 Mar 8]. 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