{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,5]],"date-time":"2026-04-05T09:02:15Z","timestamp":1775379735217,"version":"3.50.1"},"reference-count":48,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2024,11,26]],"date-time":"2024-11-26T00:00:00Z","timestamp":1732579200000},"content-version":"vor","delay-in-days":330,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100006396","name":"Qazvin University of Medical Sciences","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100006396","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["The Scientific World Journal"],"published-print":{"date-parts":[[2024,1]]},"abstract":"<jats:p><jats:bold>Background and Objectives:<\/jats:bold> Contemporary dentistry focuses on more conservative treatment options such as endocrown restorations and application of dental materials with higher resemblance to tooth structure. Polyether ether ketone (PEEK) polymer is a material used for the fabrication of endocrowns. This study aimed to compare the post\u2010fatigue resistance (PFR) of mandibular first molars restored with PEEK and lithium disilicate (LS<jats:sub>2<\/jats:sub>) endocrown restorations.<\/jats:p><jats:p><jats:bold>Materials and Methods:<\/jats:bold> This in vitro, experimental study was conducted on 20 human mandibular first molars with similar dimensions. The teeth were prepared for endocrown restoration and were assigned to two groups (<jats:italic>n<\/jats:italic>\u2009=\u200910) of PEEK and LS<jats:sub>2<\/jats:sub> endocrowns. After fabrication by the computer\u2010aided design and computer\u2010aided manufacturing (CAD\u2010CAM) technique, the restorations were cemented with resin cement. Next, the teeth underwent 15,000 thermal cycles followed by cyclic loading with 600,000 cycles of compressive force (100\u2009N, 4\u2009Hz) and were then subjected to compressive load application in a universal testing machine. The load causing endocrown failure was recorded as the PFR of the respective restoration. The failure mode was also inspected under a light microscope. Data were analyzed by the independent <jats:italic>t<\/jats:italic>\u2010test and also chi\u2010square, Mann\u2013Whitney, and Fisher\u2019s exact tests (<jats:italic>\u03b1<\/jats:italic>\u2009&lt;\u20090.05).<\/jats:p><jats:p><jats:bold>Results:<\/jats:bold> The teeth with PEEK endocrowns showed significantly higher PFR than those with LS<jats:sub>2<\/jats:sub> endocrowns. Irreparable fractures were dominant in both groups.<\/jats:p><jats:p><jats:bold>Conclusion:<\/jats:bold> PEEK may serve as a suitable alternative to LS<jats:sub>2<\/jats:sub> for the fabrication of endocrown restorations.<\/jats:p>","DOI":"10.1155\/tswj\/8648372","type":"journal-article","created":{"date-parts":[[2024,11,27]],"date-time":"2024-11-27T06:54:02Z","timestamp":1732690442000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Comparative Assessment of Post\u2010Fatigue Resistance of Mandibular First Molars Restored With Polyether Ether Ketone and Lithium Disilicate Endocrowns"],"prefix":"10.1155","volume":"2024","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0122-9996","authenticated-orcid":false,"given":"Mehrak","family":"Amjadi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-0333-3911","authenticated-orcid":false,"given":"Mohammad Raouf","family":"Safari","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-2297-3122","authenticated-orcid":false,"given":"Ramin","family":"Dini Torkamani","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-7218-8574","authenticated-orcid":false,"given":"Mohammadsepehr","family":"Kheiri Manjili","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3676-526X","authenticated-orcid":false,"given":"Davoud","family":"Jamshidi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-6475-1688","authenticated-orcid":false,"given":"Fatemeh","family":"Sobhan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6896-6192","authenticated-orcid":false,"given":"Soolmaz","family":"Heidari","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2024,11,26]]},"reference":[{"key":"e_1_2_10_1_2","volume-title":"Cohen\u2019s Pathways of the Pulp","author":"Dietschi D.","year":"2021"},{"key":"e_1_2_10_2_2","doi-asserted-by":"publisher","DOI":"10.1097\/00004770-200405000-00001"},{"key":"e_1_2_10_3_2","doi-asserted-by":"publisher","DOI":"10.17096\/jiufd.71363"},{"key":"e_1_2_10_4_2","first-page":"156","article-title":"Crown and Post-Free Adhesive Restorations for Endodontically Treated Posterior Teeth: From Direct Composite to Endocrowns","volume":"8","author":"Rocca G. 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