title: Influence of whitening and regular dentifrices on orthodontic clear ligature color stability.
abstract: OBJECTIVE
  This study evaluated the effect of brushing orthodontic clear ligatures with a whitening dentifrice containing a blue pigment (Close Up White Now, Unilever, London, UK) on their color stability, when exposed to a staining agent.
  
  
  METHODS
  Ligatures from 3M Unitek (Monrovia, CA, USA) and Morelli (Sorocaba, SP, Brazil) were tested. Baseline color measurements were performed and nonstained groups (control) were stored in distilled water whereas test groups were exposed for 1 hour daily to red wine. Specimens were brushed daily using regular or whitening dentifrice. Color measurements were repeated after 7, 14, 21, and 28 days using a spectrophotometer based on the CIE L*a*b* system.
  
  
  RESULTS
  Decreased luminosity (CIE L*), increased red discoloration (CIE a* axis), and increased yellow discoloration (CIE b* axis) were generally observed for ligatures exposed to the staining agent. Color variation was generally lower in specimens brushed with regular dentifrice, but ligatures brushed with whitening dentifrice were generally less red and less yellow than regular dentifrice. The whitening dentifrice led to blue discoloration trend, with visually detectable differences particularly apparent according to storage condition and ligature brand.
  
  
  CONCLUSIONS
  The whitening dentifrice containing blue pigment did not improve the ligature color stability, but it decreased yellow discoloration and increased a blue coloration.
  
  
  CONCLUSIONS
  The use of a whitening dentifrice containing blue pigment during orthodontic treatment might decrease the yellow discoloration of elastic ligatures.
authors.affiliation: Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil.
authors.forename: Adauê S
authors.initials: AS
authors.lastname: Oliveira
authors.forename: Marina R
authors.initials: MR
authors.lastname: Kaizer
authors.forename: Vinícius E
authors.initials: VE
authors.lastname: Salgado
authors.forename: Dener C
authors.initials: DC
authors.lastname: Soldati
authors.forename: Roberta C
authors.initials: RC
authors.lastname: Silva
authors.forename: Rafael R
authors.initials: RR
authors.lastname: Moraes
mesh_terms: D003116:Color; D006801:Humans; D009970:Orthodontics; D014073:Tooth Bleaching; D014100:Toothpastes
chemical_list: D014100:Toothpastes