title: Corrosion behavior of dental alloys used for retention elements in prosthodontics.
abstract: The purpose of this study was to investigate the corrosion behavior of 10 different high noble gold-based dental alloys, used for prosthodontic retention elements, according to ISO 10271. Samples of 10 high-noble and noble gold-based dental alloys were subjected to: (i) static immersion tests with subsequent analysis of ion release for eight different elements using mass spectrometry; (ii) electrochemical tests, including open-circuit potential and potentiodynamic scans; and (iii) scanning electron microscopy, followed by energy-dispersive X-ray microscopy. The results were analyzed using one-way ANOVA and Sidak multiple-comparisons post-hoc test at a level of significance of α = 0.05. Significant differences were found among the 10 alloys studied for all ions (P < 0.001). The potentiodynamic analysis showed values from -82.5 to 102.8 mV for the open-circuit potential and from 566.7 to 1367.5 mV for the breakdown potential. Both the open-circuit and the breakdown potential varied considerably among these alloys. Scanning electron microscopy analysis confirmed the existence of typically small-diameter corrosion defects, whilst the energy-dispersive X-ray analysis found no significant alteration in the elemental composition of the alloys. The results of this study reveal the variability in the corrosive resistance among the materials used for retention elements in prosthodontics.
authors.affiliation: Department of Oral Technology, School of Dentistry, University of Bonn, Bonn, Germany.
authors.forename: Judith
authors.initials: J
authors.lastname: Nierlich
authors.affiliation: Department of Oral Technology, School of Dentistry, University of Bonn, Bonn, Germany.|Department of Orthodontics, School of Dentistry, University of Bonn, Bonn, Germany.
authors.forename: Spyridon N
authors.identifier: 0000-0003-1968-3326
authors.initials: SN
authors.lastname: Papageorgiou
authors.affiliation: Department of Oral Technology, School of Dentistry, University of Bonn, Bonn, Germany.
authors.forename: Christoph
authors.initials: C
authors.lastname: Bourauel
authors.affiliation: Department of Prosthetic Dentistry, Preclinical Education and Materials Science, School of Dentistry, University of Bonn, Bonn, Germany.
authors.forename: Robert
authors.initials: R
authors.lastname: Hültenschmidt
authors.affiliation: Department of Prosthetic Dentistry, Preclinical Education and Materials Science, School of Dentistry, University of Bonn, Bonn, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Bayer
authors.affiliation: Department of Prosthetic Dentistry, Preclinical Education and Materials Science, School of Dentistry, University of Bonn, Bonn, Germany.
authors.forename: Helmut
authors.initials: H
authors.lastname: Stark
authors.affiliation: Department of Oral Technology, School of Dentistry, University of Bonn, Bonn, Germany.|Department of Prosthetic Dentistry, Preclinical Education and Materials Science, School of Dentistry, University of Bonn, Bonn, Germany.
authors.forename: Ludger
authors.initials: L
authors.lastname: Keilig
mesh_terms: D003343:Corrosion; D003722:Dental Alloys; D006046:Gold; D006047:Gold Alloys; D008422:Materials Testing; D011476:Prosthodontics; D013499:Surface Properties
chemical_list: D003722:Dental Alloys; D006047:Gold Alloys; D006046:Gold
keywords: alloy; corrosion; metal ion; prosthodontic; retention element