{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T23:05:58Z","timestamp":1775689558764,"version":"3.50.1"},"reference-count":27,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2021,6,22]],"date-time":"2021-06-22T00:00:00Z","timestamp":1624320000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Prosthodontics"],"published-print":{"date-parts":[[2022,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>To compare retentive forces of removable partial denture clasps traditionally fabricated with cobalt\u2010chromium (CoCr) material and two computer\u2010aided design and computer\u2010aided manufactured (CAD\/CAM) thermoplastic polymers.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>Forty\u2010eight clasp assemblies (16 CoCr, 16 polyetheretherketone (PEEK) and 16 polyetherketoneketone (PEKK) thermoplastic polymer) were fabricated for 48 mandibular tooth analogs. Individual clasps were inserted and removed on the tooth analogs utilizing a chewing simulator for 15,000 cycles to simulate 10 years of use. Retentive forces were measured utilizing a mechanical load tester at baseline and intervals of 1500 cycles. Data were analyzed with one\u2010way Analysis of Variance, Tukey post\u2010hoc, and paired T tests.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Mean retentive forces between all groups were significantly different (<jats:italic>p<\/jats:italic> &lt; 0.001). Retentive forces of CoCr clasps were significantly higher than both polymers (<jats:italic>p<\/jats:italic> &lt; 0.001). The mean retentive forces for PEEK were not significantly different from PEKK (<jats:italic>p<\/jats:italic> = 0.23). A significant increase in retentive forces was observed for all three clasps after the first period of cycling, followed by continual decrease for the remaining cycles. At the endpoint of 15,000 cycles, no clasp assemblies showed lower retentive forces than at initial baseline.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Thermoplastic polymer clasps demonstrated lower retentive forces compared to CoCr clasps. All three groups displayed a similar pattern of initial increase, followed by a gradual decrease, of retentive force. Despite this observation, the clasps maintained similar or higher retentive forces than measured at baseline. This resistance to fatigue and ability to fabricate with CAD\/CAM technologies provides support for clinical use of these high\u2010performance polymer (HPP) materials.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jopr.13398","type":"journal-article","created":{"date-parts":[[2021,6,3]],"date-time":"2021-06-03T18:03:42Z","timestamp":1622743422000},"page":"299-304","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Retentive Forces of Removable Partial Denture Clasp Assemblies Made from Polyaryletherketone and Cobalt\u2010Chromium: A Comparative Study"],"prefix":"10.1111","volume":"31","author":[{"given":"Frank I.","family":"Gentz","sequence":"first","affiliation":[{"name":"Prosthodontics Department, Naval Postgraduate Dental School, Naval Medical Leader &amp; Professional Development Command; Postgraduate Dental College Uniformed Services University of Health Sciences  Bethesda MD"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel I.","family":"Brooks","sequence":"additional","affiliation":[{"name":"Department of Research Programs Walter Reed National Military Medical Center  Bethesda MD"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peter C.","family":"Liacouras","sequence":"additional","affiliation":[{"name":"3D Medical Applications Center, Department of Radiology Walter Reed National Military Medical Center  Bethesda MD"},{"name":"Naval Postgraduate Dental School  Bethesda MD"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0149-1484","authenticated-orcid":false,"given":"Anton","family":"Petrich","sequence":"additional","affiliation":[{"name":"Prosthodontics Department, Naval Postgraduate Dental School, Naval Medical Leader &amp; Professional Development Command; Postgraduate Dental College Uniformed Services University of Health Sciences  Bethesda MD"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christopher M.","family":"Hamlin","sequence":"additional","affiliation":[{"name":"Prosthodontics Department, Naval Postgraduate Dental School, Naval Medical Leader &amp; Professional Development Command; Postgraduate Dental College Uniformed Services University of Health Sciences  Bethesda MD"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel O.","family":"Ellert","sequence":"additional","affiliation":[{"name":"Prosthodontics Department, Naval Postgraduate Dental School, Naval Medical Leader &amp; Professional Development Command; Postgraduate Dental College Uniformed Services University of Health Sciences  Bethesda MD"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4085-1515","authenticated-orcid":false,"given":"Ling","family":"Ye","sequence":"additional","affiliation":[{"name":"Research Department, Naval Postgraduate Dental School, Naval Medical Leader &amp; Professional Development Command; Postgraduate Dental College Uniformed Services University of Health Sciences  Bethesda MD"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,6,22]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1532-849X.2009.00441.x"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.adaj.2018.09.010"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.14219\/jada.archive.2013.0149"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1177\/0022034514546165"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.prosdent.2017.01.008"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.prosdent.2018.03.003"},{"key":"e_1_2_8_8_1","first-page":"139","article-title":"Indications for removable partial dentures: a literature review","volume":"18","author":"Wostmann B","year":"2005","journal-title":"Int J Prosthodont"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cden.2018.11.007"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.prosdent.2017.04.017"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.prosdent.2016.12.007"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.prosdent.2018.01.005"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.3109\/00016357.2013.777780"},{"key":"e_1_2_8_14_1","first-page":"448","article-title":"High\u2010performance polymers and their potential application as medical and oral implant materials: a review","volume":"24","author":"Wiesli MG","year":"2015","journal-title":"Implant Dent"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.dental.2013.12.008"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1111\/jopr.12325"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.prosdent.2017.09.008"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1111\/jopr.12968"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1111\/jopr.12712"},{"key":"e_1_2_8_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.dental.2011.10.016"},{"key":"e_1_2_8_21_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.dental.2019.02.028"},{"key":"e_1_2_8_22_1","doi-asserted-by":"publisher","DOI":"10.4274\/meandros.33043"},{"key":"e_1_2_8_23_1","first-page":"37","article-title":"An evaluation of retentive ability and deformation of acetal resin and cobalt\u2010chromium clasps","volume":"10","author":"Meenakshi A","year":"2016","journal-title":"J Clin Diagn Res"},{"key":"e_1_2_8_24_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.prosdent.2005.06.009"},{"key":"e_1_2_8_25_1","doi-asserted-by":"publisher","DOI":"10.1016\/0022-3913(81)90386-3"},{"key":"e_1_2_8_26_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpor.2019.01.002"},{"key":"e_1_2_8_27_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpor.2018.01.001"},{"key":"e_1_2_8_28_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00784-020-03642-5"}],"container-title":["Journal of Prosthodontics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/jopr.13398","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/full-xml\/10.1111\/jopr.13398","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/jopr.13398","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,8,25]],"date-time":"2023-08-25T20:03:35Z","timestamp":1692993815000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/jopr.13398"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,6,22]]},"references-count":27,"journal-issue":{"issue":"4","published-print":{"date-parts":[[2022,4]]}},"alternative-id":["10.1111\/jopr.13398"],"URL":"https:\/\/doi.org\/10.1111\/jopr.13398","archive":["Portico"],"relation":{},"ISSN":["1059-941X","1532-849X"],"issn-type":[{"value":"1059-941X","type":"print"},{"value":"1532-849X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,6,22]]},"assertion":[{"value":"2021-05-29","order":1,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2021-06-22","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}