{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,10]],"date-time":"2026-07-10T14:24:34Z","timestamp":1783693474502,"version":"3.55.0"},"reference-count":26,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2022,8,8]],"date-time":"2022-08-08T00:00:00Z","timestamp":1659916800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Clinical &amp; Exp Dental Res"],"published-print":{"date-parts":[[2022,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>To investigate the fatigue behavior of cast and laser\u2010sintered cobalt\u2010chromium (CoCr) and polyetheretherketone (PEEK) material for a removable partial denture (RPD) clasps.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Dumbbell\u2010shaped specimens were digitally designed with the center part of the dumbbell being a half\u2010round shape at the cross\u2010sectional dimension of 1.25\u2009mm to simulate a typical clasp design and dimensions. A fatigue machine with an offset axis rotation system simulated a typical undercut depth of 0.25, 0.50, and 0.75\u2009mm. Each group was subjected to 30,000 fatigue cycles (simulating 21\u2009years) or till specimen failure. Before testing, the stress value at each undercut depth for each specimen was established in a universal testing machine and SN curves were plotted for each group. Data were statistically analyzed using Kruskal\u2013Wallis and post hoc tests. The fractured surfaces were analyzed using SEM.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The average fatigue cycles with 0.25, 0.50, and 0.75\u2009mm undercuts were 27,155\u2009\u00b1\u20096277, 9298\u2009\u00b1\u20094033, 5642\u2009\u00b1\u20098785 for cast CoCr and 26,765\u2009\u00b1\u20096150, 11,318\u2009\u00b1\u20097931, 2861\u2009\u00b1\u20094803, for laser\u2010sintered CoCr, respectively. Apart from three specimens, the PEEK groups did not fail during the simulation period. Clasps with 0.25\u2009mm deflection showed significantly higher fatigue resistance than other groups (<jats:italic>p<\/jats:italic>\u2009&lt;\u2009.001). There was no significant difference in fatigue behavior between the cast and laser\u2010sintered CoCr. Microporosities at the fractured site along with irregular crack propagation were observed for cast and laser\u2010sintered CoCr specimens. Fatigue\u2010induced broken polymer crosslinking chains were observed in PEEK specimens.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>PEEK material exhibited the highest fatigue resistance and significantly lower deflection resistance. Cast and laser\u2010sintered CoCr showed similar fatigue resistance and behavior.<\/jats:p><\/jats:sec>","DOI":"10.1002\/cre2.645","type":"journal-article","created":{"date-parts":[[2022,8,8]],"date-time":"2022-08-08T13:33:13Z","timestamp":1659965593000},"page":"1496-1504","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Fatigue behavior of removable partial denture cast and laser\u2010sintered cobalt\u2010chromium (CoCr) and polyetheretherketone (PEEK) clasp materials"],"prefix":"10.1002","volume":"8","author":[{"given":"Jenny","family":"Zheng","sequence":"first","affiliation":[{"name":"Faculty of Dentistry, Sir John Walsh Research Institute University of Otago Dunedin New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John M.","family":"Aarts","sequence":"additional","affiliation":[{"name":"Faculty of Dentistry, Sir John Walsh Research Institute University of Otago Dunedin New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4722-7766","authenticated-orcid":false,"given":"Sunyoung","family":"Ma","sequence":"additional","affiliation":[{"name":"Faculty of Dentistry, Sir John Walsh Research Institute University of Otago Dunedin New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John N.","family":"Waddell","sequence":"additional","affiliation":[{"name":"Faculty of Dentistry, Sir John Walsh Research Institute University of Otago Dunedin New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4815-559X","authenticated-orcid":false,"given":"Joanne J. 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