Effect of fluoride-containing products on nickel-free orthodontic brackets

Main Article Content

Natsinee Pipatvadekul
Kanlaya Insee
Samroeng Inglam


Objectives: To investigate the nickel ion release, surface morphology, and surface roughness of nickel-free orthodontic brackets after exposed to different fluoride-containing products.

Materials and methods: Twelve samples of nickel-free orthodontic brackets were divided into 3 groups and exposed to different fluoride-containing products; fluoride varnish, acidulated phosphate fluoride solution, or artificial saliva without fluoride as a control group. The exposure time was following the recommended time of each product. The brackets were exposed to these products following their instructions. Then, all samples were removed from solutions and immersed in artificial saliva for 7 days. The amount of nickel ion and surface roughness were determined with inductively coupled plasma mass spectrometry and a non-contact optical 3-dimensional surface characterization and roughness measuring device, respectively. Their surfaces were evaluated using a scanning electron microscope. The data were analyzed by one-way ANOVA and Tukey’s test at a significance level of 0.05.

Results: The amount of nickel ion released was low and there was no significant difference between control, fluoride varnish, and APF group (p=0.12). The mean ± SD of nickel ion concentration were irregularities and grooves were presented on the surfaces of nickel-free brackets in fluoride varnish and APF group. Average surface roughness was higher in the fluoride varnish and APF group compared to the control group but there were also no significant differences between the three groups (p=0.06).

Conclusion: Fluoride varnish and APF gel have a minor effect on nickel-free orthodontic brackets in the aspect of nickel ion released and surface roughness. These products can be used in orthodontic patients who were treated with fixed nickel-free appliances.


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Pipatvadekul N, Insee K, Inglam S. Effect of fluoride-containing products on nickel-free orthodontic brackets. M Dent J [Internet]. 2021 Apr. 26 [cited 2023 Dec. 7];41(1):69-74. Available from: https://he02.tci-thaijo.org/index.php/mdentjournal/article/view/246884
Original articles
Author Biography

Kanlaya Insee, Faculty of Dentistry, Thammasat University, Pathumthani, Thailand

Department of Orthodontics, Faculty of Dentistry, Thammasat University


House K, Sernetz F, Dymock D, Sandy JR, Ireland AJ. Corrosion of orthodontic appliances--should we care? Am J Orthod Dentofacial Orthop 2008; 133: 584-92.

Golz L, Papageorgiou SN, Jager A. Nickel hypersensitivity and orthodontic treatment: a systematic review and meta-analysis. Contact Dermatitis 2015; 73: 1-14.

Romaguera C, Vilaplana J, Grimalt F. Contact stomatitis from a dental prosthesis. Contact Dermatitis 1989; 21: 204.

Simonsen AB, Deleuran M, Johansen JD, Sommerlund M. Contact allergy and allergic contact dermatitis in children - a review of current data. Contact Dermatitis 2011; 65: 254-65.

Golz L, Bayer S, Keilig L, Jager A, Stark H, Bourauel C, et al. Possible implications of Ni(II) on oral IL-1beta-induced inflammatory processes. Dent Mater 2014; 30: 1325-35.

Kolokitha OE, Chatzistavrou E. A severe reaction to ni-containing orthodontic appliances. Angle Orthod 2009; 79: 186-92.

Pazzini CA, Pereira LJ, Carlos RG, de Melo GE, Zampini MA, Marques LS. Nickel: periodontal status and blood parameters in allergic orthodontic patients. Am J Orthod Dentofacial Orthop 2011; 139: 55-9.

Pantuzo MC, Zenobio EG, de Andrade Marigo H, Zenobio MA. Hypersensitivity to conventional and to nickel-free orthodontic brackets. Braz Oral Res 2007; 21: 298-302.

Costa MT, Lenza MA, Gosch CS, Costa I, Ribeiro-Dias F. In vitro evaluation of corrosion and cytotoxicity of orthodontic brackets. J Dent Res 2007; 86: 441-5.

Ortiz AJ, Fernandez E, Vicente A, Calvo JL, Ortiz C. Metallic ions released from stainless steel, nickel-free, and titanium orthodontic alloys: toxicity and DNA damage. Am J Orthod Dentofacial Orthop 2011; 140: e115-22.

Boere G. Influence of fluoride on titanium in an acidic environment measured by polarization resistance technique. J Appl Biomater 1995; 6: 283-8.

Saporeti MP ME, Sales WF. In vitro corrosion of metallic orthodontic brackets: influence of artificial saliva with and without fluorides. Dental Press J Orthod 2012; 17: 24.e1-7.

Heravi F, Moayed MH, Mokhber N. Effect of fluoride on nickel-titanium and stainless steel orthodontic archwires: an in-vitro study. J Dent (Tehran) 2015; 12: 49-59.

Schiff N, Grosgogeat B, Lissac M, Dalard F. Influence of fluoridated mouthwashes on corrosion resistance of orthodontics wires. Biomaterials 2004; 25: 4535-42.

Yanisarapan T, Thunyakitpisal P, Chantarawaratit P-o. Corrosion of metal orthodontic brackets and archwires caused by fluoride-containing products: Cytotoxicity, metal ion release and surface roughness. Orthodontic Waves 2018; 77: 79-89.

Walker MP, White RJ, Kula KS. Effect of fluoride prophylactic agents on the mechanical properties of nickel-titanium-based orthodontic wires. Am J Orthod Dentofacial Orthop 2005; 127: 662-9.

Kao CT, Ding SJ, He H, Chou MY, Huang TH. Cytotoxicity of orthodontic wire corroded in fluoride solution in vitro. Angle Orthod 2007; 77: 349-54.

Schiff N, Boinet M, Morgon L, Lissac M, Dalard F, Grosgogeat B. Galvanic corrosion between orthodontic wires and brackets in fluoride mouthwashes. Eur J Orthod 2006; 28: 298-304.

Schiff N, Dalard F, Lissac M, Morgon L, Grosgogeat B. Corrosion resistance of three orthodontic brackets: a comparative study of three fluoride mouthwashes. Eur J Orthod 2005; 27: 541-9.

Kuhta M, Pavlin D, Slaj M, Varga S, Lapter-Varga M, Slaj M. Type of archwire and level of acidity: effects on the release of metal ions from orthodontic appliances. Angle Orthod 2009; 79: 102-10.

Huang HH. Corrosion resistance of stressed NiTi and stainless steel orthodontic wires in acid artificial saliva. J Biomed Mater Res A 2003; 66: 829-39.

Alavi S, Farahi A. Effect of fluoride on friction between bracket and wire. Dent Res J (Isfahan) 2011; 8(Suppl 1): S37-42.

Europe WROf. Air Quality Guidelines - Second Edition. Chapter 6.10 Nickel. 2000.

Alvarez K, Hyun SK, Fujimoto S, Nakajima H. In vitro corrosion resistance of Lotus-type porous Ni-free stainless steels. J Mater Sci Mater Med 2008; 19: 3385-97.

Gioka C, Bourauel C, Zinelis S, Eliades T, Silikas N, Eliades G. Titanium orthodontic brackets: structure, composition, hardness and ionic release. Dent Mater 2004; 20: 693-700.

Agarwal CO, Vakil KK, Mahamuni A, Tekale PD, Gayake PV, Vakil JK. Evaluation of surface roughness of the bracket slot floor--a 3D perspective study. Prog Orthod 2016; 17: 3.