Effect of fluoride content of mouthwashes on the metallic ion release in different orthodontics archwires
Author
Pastor, Francisco
Rodríguez Fernández, Juan Carlos
Barrera, José María
Delgado García-Menocal, José Angel
Brizuela, Aritza
Puigdollers, Andreu
Espinar, Eduardo
Publication date
2023ISSN
1660-4601
Abstract
Metal ion release studies were carried out on three of the most commonly used orthodontic wires in the clinic: austenitic stainless steel, Ti-Mo, and superelastic NiTi, using three mouthwashes with different fluoride concentrations: 130, 200, and 380 ppm. Immersions were carried out in these mouthwashes at 37 °C for 1, 4, 7, and 14 days, and the ions released were determined by inductively coupled plasma-mass spectrometry (ICP-MS). All wires were observed by scanning electron microscopy (SEM). The results showed a moderate ion release in the stainless steel wires, with nickel and chromium values of 500 and 1000 ppb in the worst conditions for the wires: concentrations of 380 ppm fluoride and 14 days of immersion. However, in the Ti-Mo and NiTi alloys, an abrupt change in release was observed when the samples were immersed in 380 ppm fluoride concentrations. Titanium releases in Ti-Mo wires reached 200,000 ppb, creating numerous pits on the surface. Under the same conditions, the release of Ni and Ti ions from the superelastic wires also exceeded 220,000 ppb and 180,000 ppb, respectively. This release of ions causes variations in the chemical composition of the wires, causing the appearance of martensite plates in the austenitic matrix after 4 days of immersion. This fact causes it to lose its superelastic properties at a temperature of 37 °C. In the case of immersion in 380 ppm mouthwashes for more than 7 days, rich-nickel precipitates can be seen. These embrittle the wire and lose all tooth-correcting properties. It should be noted that the release of Ni ions can cause hypersensitivity in patients, particularly women. The results indicate that the use of mouthwashes with a high content of fluoride should not be recommended with orthodontic archwires.
Document Type
Article
Document version
Published version
Language
English
Subject (CDU)
616.3 - Pathology of the digestive system. Complaints of the alimentary canal
Keywords
Cables d'arc d'ortodòncia
Alliberament d'ions
Níquel
Col·lutoris bucals
Fluor
NitI
Ti-Mo
Acer inoxidable
Arcos de alambre de ortodoncia
Liberación de iones
Níquel
Enjuagues bucales
Fluoruro
NitI
Ti-Mo
Acero inoxidable
Orthodontic arch wires
Ion release
Nickel
Mouthwashes
Fluoride
NitI
Ti-Mo
Stainless steel
Pages
13
Publisher
MDPI
Collection
20;4
Is part of
International Journal of Environmental Research and Public Health
Citation
Pastor, Francisco; Rodríguez Fernández, Juan Carlos; Barrera, José María [et al.]. Effect of fluoride content of mouthwashes on the metallic ion release in different orthodontics archwires. International Journal of Environmental Research and Public Health, 2023, 20(4), 2780. Disponible en: <https://www.mdpi.com/1660-4601/20/4/2780/htm>. Fecha de acceso: 13 feb. 2023. DOI: 10.3390/ijerph20042780
Link to the related item
This item appears in the following Collection(s)
- Odontologia [228]
Rights
© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Except where otherwise noted, this item's license is described as https://creativecommons.org/licenses/by/4.0/