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Cytotoxicity of Metal Ions Released from NiTi and Stainless Steel Orthodontic Appliances, Part 1: Surface Morphology and Ion Release Variations

Petković Didović, Mirna; Jelovica Badovinac, Ivana; Fiket, Željka; Žigon, Jure; Rinčić Mlinarić, Marijana; Čanadi Jurešić, Gordana (2023) Cytotoxicity of Metal Ions Released from NiTi and Stainless Steel Orthodontic Appliances, Part 1: Surface Morphology and Ion Release Variations. Materials, 16 (11). ISSN 1996-1944

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Despite numerous studies on ion release from orthodontic appliances, no clear conclusions can be drawn due to complex interrelations of multiple factors. Therefore, as the first part of a comprehensive investigation of cytotoxicity of eluted ions, the objective of this study was to analyze four parts of a fixed orthodontic appliance. Specifically, NiTi archwires and stainless steel (SS) brackets, bands, and ligatures were immersed in artificial saliva and studied for morphological and chemical changes after 3-, 7-, and 14-day immersion, using the SEM/EDX technique. Ion release profiles were analyzed for all eluted ions using inductively coupled plasma mass spectrometry (ICP-MS). The results demonstrated dissimilar surface morphologies among parts of the fixed appliance, due to variations in manufacturing processes. The onset of pitting corrosion was observed for the SS brackets and bands in the as-received state. Protective oxide layers were not observed on any of the parts, but adherent layers developed on SS brackets and ligatures during immersion. Salt precipitation, mainly KCl, was also observed. ICP- MS proved to be more sensitive than SEM/EDX and exhibited results undetected by SEM/EDX. Ion release was an order-of-magnitude higher for SS bands compared to other parts, which was attributed to manufacturing procedure (welding). Ion release did not correlate with surface roughness.

Item Type: Article
Uncontrolled Keywords: orthodontic appliances ; ion elution ; surface properties ; NiTi ; stainless steel ; ligatures ; brackets ; bands
Subjects: BIOMEDICINE AND HEALTHCARE > Dental Medicine
INTERDISCIPLINARY AREAS OF KNOWLEDGE > Biotechnology in Biomedicine (natural science, biomedicine and healthcare, bioethics area
Divisions: Division of Materials Chemistry
Project titleProject leaderProject codeProject type
Utvrđivanje pojavnosti, uzroka i štetnih učinaka oksidativnog stresa izazvanog uporabom fiksnih ortodontskih napravaČanadi-Jurešić, GordanaIPS-2020-01-7418HRZZ
Depositing User: Željka Fiket
Date Deposited: 06 Jul 2023 12:16
DOI: 10.3390/ma16114156

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