{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T18:26:48Z","timestamp":1785522408052,"version":"3.56.0"},"reference-count":42,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2025,7,11]],"date-time":"2025-07-11T00:00:00Z","timestamp":1752192000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2025,7,11]],"date-time":"2025-07-11T00:00:00Z","timestamp":1752192000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["BMC Oral Health"],"abstract":"<jats:title>Abstract<\/jats:title>\n          <jats:sec>\n            <jats:title>Purpose<\/jats:title>\n            <jats:p>The present research aimed to assess the impact of endodontic access cavity preparation on the fracture resistance of CAD-CAM crowns.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Materials and methods<\/jats:title>\n            <jats:p>A total of 40 extracted human upper first premolars were utilized in present research. All premolars were affixed in epoxy resin blocks, prepared by utilizing a CNC milling machine to receive full coverage ceramic crowns, and evenly split into two primary groups based on the type of ceramic; Group LD: teeth restored with lithium-disilicate (LD) crowns, and Group PIC: teeth restored with polymer-infiltrated ceramic (PIC) crowns. Every group was subdivided into 2 subgroups (<jats:italic>n<\/jats:italic>=10); Subgroup LDI: Intact LD crowns, Subgroup LDR: Repaired LD crowns, Subgroup PICI: Intact vita PIC crowns, and Subgroup PICR: Repaired PIC crowns. Crowns were cemented using Calibra Universal resin cement. The repaired subgroups received a standardized access cavity at the center of the occlusal surface and then repaired with direct composite resin. All samples were exposed to thermo-mechanical loading in a chewing simulator for 118,000 cycles, loaded until failure, and then statistically analyzed.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>For intact control subgroups, the greatest mean scores were showed in PICI (1308.71\u00b1244.15 N) compared to LDI (1154.38\u00b1133.83 N), and the variation was not statistically significant (<jats:italic>P<\/jats:italic>=0.097). For repaired subgroups, the highest mean values were recorded for PICR (727.84\u00b1240.52 N) compared to LDR (707.03\u00b1298.28 N), and the variation was not statistically significant (<jats:italic>P<\/jats:italic>=0.866). <\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusions<\/jats:title>\n            <jats:p>Both LD and PIC crowns perform the same after exposure to an endodontic access cavity, suggesting their repairability and useability.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/s12903-025-05934-2","type":"journal-article","created":{"date-parts":[[2025,7,11]],"date-time":"2025-07-11T15:09:16Z","timestamp":1752246556000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Impact of endodontic access cavity preparation on the fracture resistance of CAD-CAM crowns"],"prefix":"10.1186","volume":"25","author":[{"given":"Abdelazim","family":"Gamal","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohamed F.","family":"Aldamaty","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hussein R.","family":"Mohamed","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hesham I.","family":"Othman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,7,11]]},"reference":[{"issue":"4","key":"5934_CR1","doi-asserted-by":"publisher","first-page":"260","DOI":"10.1016\/S0022-3913(07)60110-3","volume":"98","author":"SK Hussain","year":"2007","unstructured":"Hussain SK, McDonald A, Moles DR. 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(Ethical code: 686\/3893). Considering the retrospective nature of the study, the informed consent to participate is waived by the same ethics committee. This study was conducted in compliance with the Declaration of Helsinki, ensuring that ethical standards were met throughout the research process.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"1147"}}