Abstract
This work aimed to evaluate the salivary concentration of chemical elements in patients undergoing orthodontic treatment with fixed orthodontic appliances and removable aligners. Twelve Angle Class I and II orthodontic patients undergoing treatment with conventional fixed appliances and 15 patients treated with removable aligners provided unstimulated whole saliva samples before treatment (pre) and after 3 months of treatment (post). The concentration and secretion rate of chemical elements in saliva were determined by total reflection X-ray fluorescence. Differences from pre to post and between groups were determined with the paired T test or Wilcoxon test, and two-way ANOVA, considering P < 0.05. The concentrations of S, Cl, and K decreased, while Zn increased significantly (P < 0.05) between pre and post treatment with the fixed appliance treatment. The salivary secretion rate of S was decreased from pre to post in the fixed appliance group. No differences in the concentration and secretion rate of chemical elements were detected from pre to post in the Invisalign group. Fe secretion rate presented an interaction between time and treatment, with lower secretion at post (P = 0.02) in the Invisalign group. Increased Br secretion rate and decreased Rb, Fe, P, and K in Invisalign patients suggested a better salivary electrolyte profile regarding periodontal bone remodeling. No significant alterations in ions associated with metal corrosion and inflammatory reactions were detected in orthodontic patients under dental plaque control.
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Acknowledgments
The authors thank the Integrale (Londrina, PR, Brazil) and Rotta Institute (Presidente Prudente, SP, Brazil) for authorization to recruit patients and technical support in data sampling.
Funding
This study was supported by the Annual Research Award Program, 2018, Align Technology, Inc. (São José, California – USA) in the form of purchasing consumables and equipment; and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brazil) for grants to ACZ (n. 1763037/2017) and BGD (n.1760771/2017).
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ACZ: Master student in Dentistry responsible for research project design, patient selection, radiographic analysis, hygiene and periodontal control of patients, collection of biological samples, data analysis, and scientific writing. BGD: Master student in Dentistry responsible for research project design, patient selection, hygiene and periodontal control of patients, collection of biological samples, data analysis, and scientific writing. DCMMS: Master student in Dentistry responsible for patient selection, radiographic analysis, dental plaque control, collection of biological samples, data analysis, and scientific writing. LOR: Orthodontist responsible for research project design, patient diagnostics, treatment planning and execution, data analysis, and scientific writing. EIJ: Doctor in physics responsible for TXRF analysis and data spectra analysis, statistical analysis, and scientific writing. ACA: Doctor in physics responsible for research project design, TXRF analysis, statistical analysis, and scientific writing. SPR: Research project coordinator.
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This work received financial support from Align technology Inc., manufacturer of Invisalign orthodontic appliances. This project was awarded the Annual Research Award Program, 2018, promoted by Align technology Inc. which financed the purchase of research reagents and equipment.
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All study procedures were approved by the Research Ethics Committee of the State University of Londrina, protocol no. 2.682.872. The study was performed in accordance with the recommendations of the Declaration of Helsinki.
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Campos Zeffa, A., Dias, B.G., Silva, D.C.M.S. et al. Influence of Conventional or Invisalign Orthodontic Treatment on Mineral and Trace Element Salivary Levels: Longitudinal Study with Total Reflection X-ray Fluorescence. Biol Trace Elem Res 199, 2565–2572 (2021). https://doi.org/10.1007/s12011-020-02396-1
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DOI: https://doi.org/10.1007/s12011-020-02396-1