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A method for producing controlled fluoride release from an orthodontic bracket

Lookup NU author(s): Dr Ross Hobson, Zhuoqun Yan, Professor John McCabe


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The aim of this study was to manufacture and test, in vitro, a novel modification to provide fluoride-releasing orthodontic brackets. Thirty-two orthodontic brackets were drilled to produce a recess (approximately 1.3 mm in diameter and 0.7 mm in depth) at the centre of the bracket base. Four materials, with and without the addition of sodium fluoride, a glass ionomer cement (Ketac Cem μ), a resin-modified glass ionomer cement (RMGIC; GC Fuji Ortho LC), a zinc phosphate (Zinc Cement Improved), and a resin (Transbond XT) were used to fill the recess in the bracket base. Fluoride release was measured daily during the first week and then weekly for 10 weeks. An ion chromatograph with suppressed conductivity was used for free fluoride ion determination. Statistical analysis to determine the amount of flouride release was undertaken using analysis of variance and Tukey's test.During the first 2 weeks, the resin group, with the addition of 38 per cent sodium fluoride added, released significantly more free fluoride (P < 0.05), but after 2 weeks the fluoride release markedly decreased. After 5 weeks, the RMGIC group, with 15 per cent added sodium fluoride, had significantly higher (P < 0.05) daily fluoride release than the other groups. The findings demonstrated that an appropriate fluoridated material can be used as a fluoride-releasing reservoir in a modified orthodontic bracket to enable it to release fluoride over the period of fixed appliance treatment. The Author 2007. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved.

Publication metadata

Author(s): Li S, Hobson RS, Bai Y, Yan Z, Carrick TE, McCabe JF

Publication type: Article

Publication status: Published

Journal: European Journal of Orthodontics

Year: 2007

Volume: 29

Issue: 6

Pages: 550-554

Print publication date: 01/12/2007

ISSN (print): 0141-5387

ISSN (electronic): 1460-2210

Publisher: Oxford University Press


DOI: 10.1093/ejo/cjm046

PubMed id: 17804428


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