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Effect of Chlorhexidine-Containing Prophylactic Agent on the Surface Characterization and Frictional Resistance Between Orthodontic Brackets and Archwires: An in Vitro Study Publisher Pubmed



Nik TH1 ; Hooshmand T2 ; Farazdaghi H3 ; Mehrabi A1 ; Razavi ESE1
Authors
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Authors Affiliations
  1. 1. Department of Orthodontics, Dental Research Center, School of Dentistry, Tehran University of Medical Sciences, Tehran 14174, Iran
  2. 2. Department of Dental Biomaterials, School of Dentistry/Research Center for Science and Technology in Medicine, Tehran University of Medical Sciences, Tehran 14174, Iran
  3. 3. Department of Oral and Maxillofacial Radiology, School of Dentistry, Khorasgan (Isfahan branch), Islamic Azad University, Isfahan 16578, Iran

Source: Progress in Orthodontics Published:2013


Abstract

Background: The purpose of this study was to assess the surface characterization and frictional resistance between stainless steel brackets and two types of orthodontic wires made of stainless steel and nickel-titanium alloys after immersion in a chlorhexidine-containing prophylactic agent. Methods: Stainless steel orthodontic brackets with either stainless steel (SS) or heat-activated nickeltitanium (Ni-Ti) wires were immersed in a 0.2% chlorhexidine and an artificial saliva environment for 1.5 h. The frictional force was measured on a universal testing machine with a crosshead speed of 10 mm/min over a 5-mm of archwire. The surface morphology of bracket slots and surface roughness of archwires after immersion in chlorhexidine were also characterized using a scanning electron microscope (SEM) and an atomic force microscope (AFM), respectively. Results: There was no significant difference in the frictional resistance values between SS and Ni-Ti wires immersed in either chlorhexidine or artificial saliva. The frictional resistance values for the SS and Ni-Ti wires immersed in 0.2% chlorhexidine solution were not significantly different from that inartificial saliva. No significant difference in the average surface roughness for both wires before (as-received) and after immersion in either chlorhexidine or artificial saliva was observed. Conclusions: One-and-half-hour immersion in 0.2% chlorhexidine mouthrinse did not have significant influence on the archwires surface roughness or the frictional resistance between stainless steel orthodontic brackets and archwires made of SS and Ni-Ti. Based on these results, chlorhexidine-containing mouthrinses may be prescribed as non-destructive prophylactic agents on materials evaluated in the present study for orthodontic patients. © 2013 Nik et al.
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