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Title: Metal Release and Surface Degradation of Fixed Orthodontic Appliances during the Dental Levelling and Aligning Phase: A 12-Week Study
Authors: Frois, António 
Mendes, Alexandra Ricardo 
Pereira, Sónia Alves 
Louro, Cristina Santos 
Keywords: fixed orthodontic appliances; corrosion; metal release; nickel; biofilm
Issue Date: 2022
Project: FCT - PhD Grant SFRH/BD/143905/2019 
Serial title, monograph or event: Coatings
Volume: 12
Issue: 5
Abstract: The purpose of the present study is twofold: (i) to assess the salivary nickel, chromium, and iron concentrations and (ii) to characterize the surface microstructure of the typical commercially available Ni-containing metallic appliances during the first 12-week orthodontic treatment period. A total of 85 unstimulated saliva samples were collected from patients before treatment, after 2 days, and after 1, 4, and 12 weeks. Salivary ion concentrations were determined by inductively coupled plasma optical emission spectroscopy, and data were analyzed with the Statistical Package for Social Sciences (IBM SPSS) software. The recorded mean metal concentrations were in the ranges of 132–175 g/L for Ni, 171–192 g/L for Cr, and 826–1023 g/L for Fe. No statistically significant variations were observed between the different study times, and the null hypothesis (the concentrations of metallic ions in patients’ saliva did not significantly change after the placement of the orthodontic appliances) was accepted (p > 0.05). Mean salivary metallic ions were below toxic levels, and no adverse clinical reactions were registered. The intraoral surface degradation of the fixed components was corroborated by optical microscopy, scanning electron microscopy, and energy dispersive spectrometry. Microstructural analysis after complete orthodontic procedure confirmed different corrosion types, from pitting to biocorrosion.
ISSN: 2079-6412
DOI: 10.3390/coatings12050554
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais
I&D ICBR - Artigos em Revistas Internacionais
FMUC Med. Dentária - Artigos em Revistas Internacionais
I&D CIBB - Artigos em Revistas Internacionais

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