{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,10]],"date-time":"2026-07-10T10:12:53Z","timestamp":1783678373972,"version":"3.55.0"},"reference-count":22,"publisher":"Springer Science and Business Media LLC","issue":"7","license":[{"start":{"date-parts":[[2026,6,11]],"date-time":"2026-06-11T00:00:00Z","timestamp":1781136000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2026,6,11]],"date-time":"2026-06-11T00:00:00Z","timestamp":1781136000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"name":"Justus-Liebig-Universit\u00e4t Gie\u00dfen"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Clin Oral Invest"],"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>The purpose of this retrospective cohort study was to investigate the clinical performance and longevity of double-crown-retained removable-dental-prostheses (DCR-RDP) with spark-eroded friction pins inserted in a general dental practice and followed up over a period of 30 years.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Materials and methods<\/jats:title>\n                    <jats:p>\n                      This retrospective cohort study observed the influence of various factors on the longevity of the DCR-RDPs with spark-eroded friction pins and the abutment teeth using Kaplan-Meier estimation (log-rank test,\n                      <jats:italic>p<\/jats:italic>\n                      &lt; .05) estimation and Cox regression (\u03b1\u2009=\u20090.05).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      During a mean follow-up of 14.07\u2009\u00b1\u20097.89 years (max 31.66 years), 196 prostheses and 563 abutments were observed. 30.61% (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200960) of the prostheses and 39.43% (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u2009222) of the abutments failed. The mean survival time for the prostheses was 22.66\u2009\u00b1\u20090.86 years (95% CI:20.97 to 24.24 years), and for the abutments, 20.29\u2009\u00b1\u20090.51 years (95% CI: 19.29 to 21.29 years). The following factors had a significant influence on the performance of either the prostheses or the abutment teeth: Kennedy class, number of replaced teeth, opposing dentition, number of abutments, crown-root ratio, probing depth, location, and vitality (\n                      <jats:italic>p<\/jats:italic>\n                      &lt;.05).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The highest survival rates were shown by Kennedy Class III DCR-RDPs and abutment teeths, while the lowest were seen with prostheses with 11 or more replaced teeth. The number of abutment teeth, pocket depth, vitality, and crown\/root length ratio should also be considered in terms of the abutment teeth\u2019s longevity.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00784-026-06971-z","type":"journal-article","created":{"date-parts":[[2026,6,11]],"date-time":"2026-06-11T08:35:51Z","timestamp":1781166951000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Up to 30 years of clinical performance of double-crown-retained removable dental prostheses with spark-eroded friction pins placed in a general dental practice"],"prefix":"10.1007","volume":"30","author":[{"given":"Karina","family":"Zierden","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seline","family":"Werdecker","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bernd","family":"W\u00f6stmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"Rehmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,6,11]]},"reference":[{"key":"6971_CR1","doi-asserted-by":"publisher","first-page":"1623","DOI":"10.1007\/s00784-022-04788-0","volume":"27","author":"S Hinz","year":"2023","unstructured":"Hinz S, B\u00f6micke W, Schweyen R, Bensel T (2023) Ten-year clinical performance of non-precious metal double crowns with friction pins in severely reduced dentitions-a retrospective study. 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