Comparative analysis of the retention force and deformation of PEEK and PEKK removable partial denture clasps with different thicknesses and undercut depths.

Autor: Lee WF; Associate Professor, School of Dental Technology, Taipei Medical University, Taipei, Taiwan, ROC; and PhD student, School of Dentistry, Taipei Medical University, Taipei, Taiwan, ROC., Chen MS; Associate Professor, School of Dentistry, Taipei Medical University, Taipei, Taiwan, ROC; and Visiting Doctor, Division of Prosthodontics, Department of Dentistry, Taipei Medical University Hospital, Taipei, Taiwan, ROC., Peng TY; Assistant Professor, School of Dentistry, Taipei Medical University, Taipei, Taiwan, ROC., Huang PC; Dental Technician, School of Dental Technology, Taipei Medical University, Taipei, Taiwan, ROC., Nikawa H; Professor, Department of Oral Biology & Engineering, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima City, Hiroshima, Japan., Peng PW; Professor, School of Dental Technology, Taipei Medical University, Taipei, Taiwan, ROC. Electronic address: apon@tmu.edu.tw.
Jazyk: angličtina
Zdroj: The Journal of prosthetic dentistry [J Prosthet Dent] 2024 Feb; Vol. 131 (2), pp. 291.e1-291.e9. Date of Electronic Publication: 2023 Dec 05.
DOI: 10.1016/j.prosdent.2023.09.042
Abstrakt: Statement of Problem: The retentive force and deformation of milled polyetheretherketone (PEEK) and polyetherketoneketone (PEKK) removable partial denture (RPD) frameworks are not well understood.
Purpose: The purpose of this in vitro study was to assess the retentive force and deformation of PEEK and PEKK Akers clasps with different designs and undercut depths.
Material and Methods: A master model containing the first and second molar abutments was used to design Akers clasps of different cross-sectional dimensions, undercut depths (0.5 and 0.75 mm), and materials. The components of the removable partial denture framework also included an occlusal rest and were manufactured using a milling machine (n=5). The fatigue resistance of the Akers clasps was measured before and after deformation regarding the retentive forces.
Results: The PEEK2-U50 clasp had the largest retentive force with no significant difference among all groups before and after the insertion and removal cycle. In addition, the increased cross-sectional dimensions of the design resulted in significant differences in retentive forces between the PEEK1 and PEEK2 groups and between the PEEK and PEKK materials.
Conclusions: Increasing the clasp's cross-sectional dimensions significantly impacted retentive forces, especially between different PEEK groups and between PEEK and PEKK materials.
(Copyright © 2024 Editorial Council for The Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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