{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,23]],"date-time":"2026-08-23T14:58:12Z","timestamp":1787497092914,"version":"build-2736575974"},"reference-count":41,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2022,4,13]],"date-time":"2022-04-13T00:00:00Z","timestamp":1649808000000},"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":["Journal of Prosthodontics"],"published-print":{"date-parts":[[2023,2]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>To assess the retentive force of telescopic crowns using polyetherketoneketone (PEKK) high\u2010performance polymer in relation to conventional materials over a long period of time in an in vitro setting.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Materials and Methods<\/jats:title>\n                    <jats:p>Thirty\u2010six sets of primary and secondary crowns were fabricated as per the double crown\u2010retained prostheses approach. Six samples were included in each of the five test groups (1: zirconia\/PEKK [Zr\/PEKK]; 2: titanium\/PEKK [Ti\/PEKK]; 3: cobalt\u2010chrome\/PEKK [CoCr\/PEKK]; 4: PEKK\/PEKK; and 5: gold\/PEKK [Au\/PEKK]) and the single control group (gold\/galvano\u2010gold [Au\/GA]). The insertion\u2010removal test was performed for 20,000 cycles, and the surface condition was observed. Retentive forces were analyzed using two\u2010way ANOVA (\u03b1&lt;0.05).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The retention forces in groups Zr\/PEKK and Ti\/PEKK significantly decreased over time (group 1:\n                      <jats:italic>p<\/jats:italic>\n                      = 0.035 and group 2:\n                      <jats:italic>p<\/jats:italic>\n                      = 0.001), whereas retentive force increased significantly in groups PEKK\/PEKK, Au\/PEKK, and control (group 4:\n                      <jats:italic>p<\/jats:italic>\n                      = 0.001, group 5:\n                      <jats:italic>p<\/jats:italic>\n                      = 0.008, and control:\n                      <jats:italic>p<\/jats:italic>\n                      = 0.042). Similar wear was observed on the primary crown in groups PEKK\/PEKK, gold\/PEKK, and control.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Groups PEKK\/PEKK and Au\/PEKK showed a transition of retentive force similar to the control group. Groups PEKK\/PEKK and Au\/PEKK had similar wear on the surface compared to control. Therefore, PEKK has a promising clinical potential.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/jopr.13512","type":"journal-article","created":{"date-parts":[[2022,3,28]],"date-time":"2022-03-28T07:20:41Z","timestamp":1648452041000},"page":"154-161","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Double\u2010Crown Prosthesis Retention Using Polyetherketoneketone (PEKK): An In Vitro Study"],"prefix":"10.1111","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6612-6982","authenticated-orcid":false,"given":"Kensuke","family":"Igarashi","sequence":"first","affiliation":[{"name":"Department of Dental Materials Science, The Nippon Dental University School of Life Dentistry at Niigata Niigata 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