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J Dent Res Dent Clin Dent Prospects. 2016;10(2): 106-111.
doi: 10.15171/joddd.2016.017
PMID: 27429727
PMCID: PMC4945159
  Abstract View: 999
  PDF Download: 722

Original Research

The effect of ZnO nanoparticle coating on the frictionalresistance between orthodontic wires and ceramic brackets

Ahmad Behroozian 1*, Mojgan Kachoei 2, Masumeh Khatamian 3, Baharak Divband 4

1 Assistant Professor, Department of Orthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
2 Associate Professor, Department Of Orthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
3 Professor, Inorganic Chemistry Department, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
4 Researcher, Research Center for Pharmaceutical Nanotechnology, Tabriz University of Medical Sciences, Tabriz, Iran
*Corresponding Author: Email: ahmadbehroozian@yahoo.com

Abstract

Background. Any decrease in friction between orthodontic wire and bracket can accelerate tooth movement in the sliding technique and result in better control of anchorage. This study was carried out to evaluate frictional forces by coating orthodontic wires and porcelain brackets with zinc oxide nanoparticles (ZnO).Methods. In this in vitro study, we evaluated a combination of 120 samples of 0.019×0.025 stainless steel (SS) orthodonticwires and 22 mil system edgewise porcelain brackets with and without spherical zinc oxide nanoparticles. Spherical ZnOnanoparticles were deposited on wires and brackets by immersing them in ethanol solution and SEM (scanning electronmicroscope) evaluation confirmed the presence of the ZnO coating. The frictional forces were calculated between the wiresand brackets in four groups: group ZZ (coated wire and bracket), group OO (uncoated wire and bracket), group ZO (coatedwire and uncoated bracket) and group OZ (uncoated wire and coated bracket). Kolmogorov-Smirnov, Mann-Whitney andKruskal-Wallis tests were used for data analysis.Results. The frictional force in ZZ (3.07±0.4 N) was the highest (P <0.05), and OZ (2.18±0.5 N) had the lowest amount of friction (P <0.05) among the groups. There was no significant difference in frictional forces between the ZO and OO groups (2.65±0.2 and 2.70±0.2 N, respectively).Conclusion. Coating of porcelain bracket surfaces with ZnO nanoparticles can decrease friction in the sliding technique,and wire coating combined with bracket coating is not recommended due to its effect on friction.
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Submitted: 26 Jun 2016
Accepted: 26 Jun 2016
ePublished: 26 Jun 2016
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