Scientific article
Open access

Double-crown prosthesis retention using polyetherketoneketone (PEKK): an in vitro study

Publication date2022-03-28
First online date2022-03-28

Purpose: To assess the retentive force of telescopic crowns using polyetherketoneketone (PEKK) high-performance polymer in relation to conventional materials over a long period of time in an in vitro setting.

Materials and methods: Thirty-six sets of primary and secondary crowns were fabricated as per the double crown-retained 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-chrome/PEKK [CoCr/PEKK]; 4: PEKK/PEKK; and 5: gold/PEKK [Au/PEKK]) and the single control group (gold/galvano-gold [Au/GA]). The insertion-removal test was performed for 20,000 cycles, and the surface condition was observed. Retentive forces were analyzed using two-way ANOVA (α<0.05).

Results: The retention forces in groups Zr/PEKK and Ti/PEKK significantly decreased over time (group 1: p = 0.035 and group 2: p = 0.001), whereas retentive force increased significantly in groups PEKK/PEKK, Au/PEKK, and control (group 4: p = 0.001, group 5: p = 0.008, and control: p = 0.042). Similar wear was observed on the primary crown in groups PEKK/PEKK, gold/PEKK, and control.

Conclusions: 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.

  • PEKK
  • Chromium alloys
  • Double crowns
  • Gold
  • Ketones
  • Prosthesis retention
  • Retentive force
  • Telescopic crowns
Citation (ISO format)
IGARASHI, Kensuke et al. Double-crown prosthesis retention using polyetherketoneketone (PEKK): an in vitro study. In: Journal of prosthodontics, 2022. doi: 10.1111/jopr.13512
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Article (Published version)
ISSN of the journal1059-941X

Technical informations

Creation02/14/2023 11:11:00 AM
First validation02/14/2023 11:11:00 AM
Update time03/16/2023 10:38:33 AM
Status update03/16/2023 10:38:32 AM
Last indexation02/12/2024 12:29:17 PM
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