Salivary pH Effect on Orthodontic Appliances: In Vitro Study of the SS/DLC System

Stainless steels (SS) are the most-used alloys for manufacturing fixed orthodontic appliances due to their attractive set of mechanical properties, biocompatibility, and high corrosion resistance. Nevertheless, during regular orthodontic treatments–taking at least around 2 years–the intraoral enviro...

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Autores principales:	António Fróis, Manuel Evaristo, Ana Cristina Santos, Cristina Santos Louro
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	DLC coatings stainless steel corrosion orthodontics Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/931d5396dea44191ba3d3ac6b0e9d94e
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spelling	oai:doaj.org-article:931d5396dea44191ba3d3ac6b0e9d94e2021-11-25T17:15:47ZSalivary pH Effect on Orthodontic Appliances: In Vitro Study of the SS/DLC System10.3390/coatings111113022079-6412https://doaj.org/article/931d5396dea44191ba3d3ac6b0e9d94e2021-10-01T00:00:00Zhttps://www.mdpi.com/2079-6412/11/11/1302https://doaj.org/toc/2079-6412Stainless steels (SS) are the most-used alloys for manufacturing fixed orthodontic appliances due to their attractive set of mechanical properties, biocompatibility, and high corrosion resistance. Nevertheless, during regular orthodontic treatments–taking at least around 2 years–the intraoral environment inevitably degrades these bioalloys, releasing metallic ions into the oral cavity. In the first part of this in vitro study, the corrosion resistance of commercial SS appliances (brackets, tubes, and bands) was evaluated in Fusayama-Meyer artificial saliva at pH values of 2.3 and 6.8 over the course of 30 days. As expected, the results corroborated that salivary pH highly influences corrosion behaviour. Released Ni, Cr, and Fe were within dietary intake values. In the second part, a novel approach for oral corrosion prevention based on the chemical inertness of DLC materials is presented. SS surfaces were functionalized with biocompatible a-C:H-sputtered coatings and submitted to the same experimental conditions. The anticorrosion ability of this system was demonstrated, preventing the pitting corrosion that occurred on the SS substrates. Despite the galvanic coupling effect due to the presence of the Cr-based interlayer, this study enhanced the potential use of the reactive sputter-deposited a-C:H coatings in orthodontics.António FróisManuel EvaristoAna Cristina SantosCristina Santos LouroMDPI AGarticleDLC coatingsstainless steelcorrosionorthodonticsEngineering (General). Civil engineering (General)TA1-2040ENCoatings, Vol 11, Iss 1302, p 1302 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	DLC coatings stainless steel corrosion orthodontics Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	DLC coatings stainless steel corrosion orthodontics Engineering (General). Civil engineering (General) TA1-2040 António Fróis Manuel Evaristo Ana Cristina Santos Cristina Santos Louro Salivary pH Effect on Orthodontic Appliances: In Vitro Study of the SS/DLC System
description	Stainless steels (SS) are the most-used alloys for manufacturing fixed orthodontic appliances due to their attractive set of mechanical properties, biocompatibility, and high corrosion resistance. Nevertheless, during regular orthodontic treatments–taking at least around 2 years–the intraoral environment inevitably degrades these bioalloys, releasing metallic ions into the oral cavity. In the first part of this in vitro study, the corrosion resistance of commercial SS appliances (brackets, tubes, and bands) was evaluated in Fusayama-Meyer artificial saliva at pH values of 2.3 and 6.8 over the course of 30 days. As expected, the results corroborated that salivary pH highly influences corrosion behaviour. Released Ni, Cr, and Fe were within dietary intake values. In the second part, a novel approach for oral corrosion prevention based on the chemical inertness of DLC materials is presented. SS surfaces were functionalized with biocompatible a-C:H-sputtered coatings and submitted to the same experimental conditions. The anticorrosion ability of this system was demonstrated, preventing the pitting corrosion that occurred on the SS substrates. Despite the galvanic coupling effect due to the presence of the Cr-based interlayer, this study enhanced the potential use of the reactive sputter-deposited a-C:H coatings in orthodontics.
format	article
author	António Fróis Manuel Evaristo Ana Cristina Santos Cristina Santos Louro
author_facet	António Fróis Manuel Evaristo Ana Cristina Santos Cristina Santos Louro
author_sort	António Fróis
title	Salivary pH Effect on Orthodontic Appliances: In Vitro Study of the SS/DLC System
title_short	Salivary pH Effect on Orthodontic Appliances: In Vitro Study of the SS/DLC System
title_full	Salivary pH Effect on Orthodontic Appliances: In Vitro Study of the SS/DLC System
title_fullStr	Salivary pH Effect on Orthodontic Appliances: In Vitro Study of the SS/DLC System
title_full_unstemmed	Salivary pH Effect on Orthodontic Appliances: In Vitro Study of the SS/DLC System
title_sort	salivary ph effect on orthodontic appliances: in vitro study of the ss/dlc system
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/931d5396dea44191ba3d3ac6b0e9d94e
work_keys_str_mv	AT antoniofrois salivarypheffectonorthodonticappliancesinvitrostudyofthessdlcsystem AT manuelevaristo salivarypheffectonorthodonticappliancesinvitrostudyofthessdlcsystem AT anacristinasantos salivarypheffectonorthodonticappliancesinvitrostudyofthessdlcsystem AT cristinasantoslouro salivarypheffectonorthodonticappliancesinvitrostudyofthessdlcsystem
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Salivary pH Effect on Orthodontic Appliances: In Vitro Study of the SS/DLC System

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