title: Efficacy of do-it-yourself whitening as compared to conventional tooth whitening modalities: an in vitro study.
abstract: OBJECTIVE
  To evaluate the efficacy of do-it-yourself (DIY) whitening as compared to conventional tooth whitening modalities using different shade assessment tools.
  
  
  METHODS
  Extracted human molars (120) were randomly distributed to six groups (n=20). Whitening was performed according to manufacturer's directions for over-the-counter, dentist-dispensed for home use, and in-office whitening. DIY whitening consisted of a strawberry and baking soda mix. Additionally, negative and positive controls were used. Two evaluators used the Vita Classical (VC) and Vita Bleachedguide 3D-Master with interpolated numbers (BGi) for visual assessment at baseline and one-week, one-month, and three-month postwhitening. Instrumental measurements were performed with a spectrophotometer. Kruskal-Wallis procedure was used to assess color changes among groups and intraclass correlation (ICC) to evaluate agreement between evaluators.
  
  
  RESULTS
  DIY exhibited lower color change (ΔSGUVC, ΔSGUBGi, ΔE*, where SGU = shade guide unit and E = overall color change) compared to other whitening groups at all time points (p<0.05). ICC demonstrated very good agreement between evaluators with VC and BGi at each time point. Both shade guides were related with each other and strongly related to instrumental measurements (p<0.05).
  
  
  CONCLUSIONS
  DIY whitening was the least effective whitening modality. Both VC and BGi are related with each other and have good correlation with instrumental measurements.
authors.forename: S R
authors.initials: SR
authors.lastname: Kwon
authors.forename: M
authors.initials: M
authors.lastname: Meharry
authors.forename: U
authors.initials: U
authors.lastname: Oyoyo
authors.forename: Y
authors.initials: Y
authors.lastname: Li
mesh_terms: D003116:Color; D006801:Humans; D066298:In Vitro Techniques; D004366:Nonprescription Drugs / Q000627:therapeutic use; D012648:Self Care / Q000379:methods; D014073:Tooth Bleaching / Q000379:methods*; D058205:Tooth Bleaching Agents / Q000627:therapeutic use; D016896:Treatment Outcome
chemical_list: D004366:Nonprescription Drugs; D058205:Tooth Bleaching Agents