title: Coating stability and surface characteristics of esthetic orthodontic coated archwires.
abstract: OBJECTIVE
  To evaluate the coating thickness of four brands of as-received esthetic coated rectangular archwires and their surface characteristics and coating stability after 21 days of oral exposure compared to those of conventional stainless steel (SS) and nickel titanium (NiTi) ones.
  
  
  METHODS
  The labial surface of the selected archwires was observed with a stereoscope and in a scanning electron microscope, and surface roughness was assessed with an atomic force microscope. The coating thickness of as-received wires and the percentage of coating lost on the labial surface of retrieved wires were measured using Image Pro Plus 4.5 software.
  
  
  RESULTS
  All groups showed an average coating thickness of less than 0.002 inches. After oral exposure, archwires from two groups lost all coating on the labial surface. On average, 28.71% and 72.90% of the coating was lost in each of the other two groups, and the surface roughness of the remaining coating was higher than postclinical control wires.
  
  
  CONCLUSIONS
  Coated archwires had a low esthetic value as they presented a nondurable coating. The remaining coating showed a severe deterioration and a greater surface roughness than postclinical control counterparts (conventional SS and NiTi wires).
authors: a  PhD student, Department of Orthodontics, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
authors: Dayanne Lopes
authors: DL
authors: da Silva
authors: Claudia Trindade
authors: CT
authors: Mattos
authors: Renata Autoun
authors: RA
authors: Simão
authors: Antônio Carlos
authors: AC
authors: de Oliveira Ruellas
mesh_terms: D000704:Analysis of Variance; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D004954:Esthetics; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry*; D009969:Orthodontic Wires; D010780:Photogrammetry; D012117:Resins, Synthetic / Q000737:chemistry*; D013193:Stainless Steel / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D020099:Coated Materials, Biocompatible; D012117:Resins, Synthetic; C040654:titanium nickelide; D013193:Stainless Steel; D009532:Nickel; D014025:Titanium
references: Am J Orthod Dentofacial Orthop. 2005 Apr;127(4):403-12
references: 15821684
references: Eur J Orthod. 2000 Jun;22(3):317-26
references: 10920564
references: Dent Update. 1992 Sep;19(7):276-8, 280
references: 1303362
references: Eur J Orthod. 1998 Feb;20(1):79-92
references: 9558768
references: J Orofac Orthop. 2002 May;63(3):199-211
references: 12132308
references: East Mediterr Health J. 2003 May;9(3):274-8
references: 15751919
references: Angle Orthod. 2002 Jun;72(3):222-37
references: 12071606
references: J Orthod. 2005 Jun;32(2):146-63
references: 15994990
references: Am J Orthod Dentofacial Orthop. 1994 Jul;106(1):76-87
references: 8017353
references: Am J Orthod Dentofacial Orthop. 2011 Jan;139(1):74-9
references: 21195280
references: Eur J Orthod. 2008 Dec;30(6):661-7
references: 19011166
references: Angle Orthod. 1997;67(3):197-207
references: 9188964
references: Angle Orthod. 2013 Jan;83(1):127-32
references: 22591261
references: Eur J Orthod. 2009 Jun;31(3):260-5
references: 19188281
references: Angle Orthod. 2012 Sep;82(5):922-8
references: 22339276
references: Am J Orthod Dentofacial Orthop. 2010 Feb;137(2):213-7
references: 20152677
references: Eur J Orthod. 2004 Apr;26(2):163-70
references: 15130039