{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,4,5]],"date-time":"2025-04-05T04:09:09Z","timestamp":1743826149073,"version":"3.40.3"},"reference-count":34,"publisher":"Walter de Gruyter GmbH","issue":"2","license":[{"start":{"date-parts":[[2025,1,23]],"date-time":"2025-01-23T00:00:00Z","timestamp":1737590400000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,4,28]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:sec id=\"j_bmt-2024-0038_abs_001\">\n                  <jats:title>Objectives<\/jats:title>\n                  <jats:p>The aim of the present study was to investigate, whether polyetherketoneketone (PEKK) secondary crowns could be considered as alternative to gold standard in terms of their physical properties and manufacturing costs.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec id=\"j_bmt-2024-0038_abs_002\">\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>An upper jaw model with six implants was used. Frameworks with either 6 PEKK- or 6 electroplated secondary crowns were cemented in a wear simulator. A total of 20 specimens (10 PEKK, 10 gold) run 10,000 cycles in the wear simulator with a lubricant. Additionally, 10,000 cycles in the thermocycling baths with 5\u202f\u00b0C and 55\u202f\u00b0C have gone through, before running extra 10,000 cycles in the wear simulator again. Finally, the abutments were analysed for signs of wear under the electron microscope.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec id=\"j_bmt-2024-0038_abs_003\">\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>The mean pulling out force value for PEKK was 21\u202fN. For the electroplated gold secondary crowns an average of 19\u202fN was measured. Multiple fluctuations were observed in the gold series of tests. After 20,000 cycles in the wear simulator and 10,000 cycles in the thermocycling machine, there were no major losses to be measured in terms of wear for both materials. In the microscopic analysis of the abutments, traces of wear could be seen in pull-out direction, mainly in the gold samples.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec id=\"j_bmt-2024-0038_abs_004\">\n                  <jats:title>Conclusions<\/jats:title>\n                  <jats:p>PEKK secondary crowns have lower costs, more stable retention force values and are easier to produce than the gold standard. On average, the pull-out force values were 11\u202fN higher than recommended.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1515\/bmt-2024-0038","type":"journal-article","created":{"date-parts":[[2025,1,22]],"date-time":"2025-01-22T02:51:16Z","timestamp":1737514276000},"page":"115-123","source":"Crossref","is-referenced-by-count":0,"title":["Wear investigation of implant-supported upper removable prothesis with electroplated gold or PEKK secondary crowns"],"prefix":"10.1515","volume":"70","author":[{"given":"Annika","family":"Holtz","sequence":"first","affiliation":[{"name":"Oral Technology , University of Bonn , Bonn , Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Manfred","family":"Gr\u00fcner","sequence":"additional","affiliation":[{"name":"Oral Technology , University of Bonn , Bonn , Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5950-9288","authenticated-orcid":false,"given":"Ludger","family":"Keilig","sequence":"additional","affiliation":[{"name":"Oral Technology , University of Bonn , Bonn , Germany"},{"name":"Department of Prosthodontics, Preclinical Education and Dental Materials Science , University of Bonn , Bonn , Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christoph","family":"Bourauel","sequence":"additional","affiliation":[{"name":"Oral Technology , University of Bonn , Bonn , Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Helmut","family":"Stark","sequence":"additional","affiliation":[{"name":"Department of Prosthodontics, Preclinical Education and Dental Materials Science , University of Bonn , Bonn , Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Istabrak","family":"D\u00f6rsam","sequence":"additional","affiliation":[{"name":"Oral Technology , University of Bonn , Bonn , Germany"},{"name":"Department of Prosthodontics, Preclinical Education and Dental Materials Science , University of Bonn , Bonn , Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"374","published-online":{"date-parts":[[2025,1,23]]},"reference":[{"key":"2025040407061971612_j_bmt-2024-0038_ref_001","doi-asserted-by":"crossref","unstructured":"Kanasi, E, Ayilavarapu, S, Jones, J. 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