title: Influence of surface sealant on the color-stability of a composite resin immersed in different beverages.
abstract: OBJECTIVE
  This study evaluated the influence of surface sealant (Fortify-Bisco) on the color-stability of a composite resin (Charisma-3M) immersed in different beverages.
  
  
  METHODS
  It was prepared resin specimens with 10 mm-diameter X 2 mm-thickness for each beverage (soft drink, coffee, tea and artificial saliva=control). Specimens were divided in 2 groups (with or without surface sealant) and afterwards divided in 4 subgroups (n=7) according to the immersion solution. After 24 hours, it was started the cycling in the solutions 3 times/day during 5 minutes for 90 days. Opacity (ΔL) and color change (ΔE) of specimens were analyzed with a spectrophotometer (BYK-Gardner) in the different groups in relation to the control group. This handheld portable equipment is unique.
  
  
  RESULTS
  Composite resin showed statistically significant difference (p<0.05) in the solutions, and coffee promoted the higher color change, followed by tea and soft drink. There was no difference between specimens sealed or not.
  
  
  CONCLUSIONS
  Therefore, surface sealant was inefficient on the protection against color change and coffee promoted the higher darkening of the specimens.
authors.affiliation: Faculdade de Odontologia da Universidade de Uberaba - UNIUBE, Departamento de Biomateriais, Av. Nenê Sabino, 1801, Sala 2D09 - Bairro Universitário, CEP: 38055-500 - Campus Aeroporto - Uberaba/MG; Tel:+55 34 3319-8958; e-mail:cesarlepri@yahoo.com.br.
authors.forename: Cesar Penazzo
authors.initials: CP
authors.lastname: Lepri
authors.forename: Regina Guenka
authors.initials: RG
authors.lastname: Palma-Dibb