Surface roughness evaluation and shade changes of a nanofilled resin composite after bleaching and immersion in staining solutions.
OBJECTIVE
To investigate the effect of bleaching and staining solutions on roughness and shade changes in a nanofilled resin composite [Filtek Supreme (FS)].


METHODS
FS specimens (n = 135) were light cured and separated into groups (n = 45) that were bleached with 10% carbamide peroxide (CP) agent or 16% or 35% hydrogen peroxide (HP). In the first two groups the bleaching gel was used for 4 hours a day, during 14 days, and for the third group in three sessions of 45 minutes. Each group was subdivided (n = 15) and immersed in coffee, red wine or distilled water for 3 hours a day during 40 days. The roughness values (Ra) and shade (parameter CLELab) were evaluated at baseline, after bleaching and after staining. The data was analyzed by ANOVA and Tukey test or Kruskal Wallis.


RESULTS
The effects on specimens varied depending on the bleaching product and staining solution. FS after bleaching and after staining presented higher roughness. In the evaluation of shade changes after bleaching, it was observed that resin color changed and that 35% hydrogen peroxide bleached the resin more than the others. After staining in three solutions, all specimens changed color and wine showed the higher staining capacity.
Department of Dental Materials, Regional University of Blumenau (FURB), Blumenau, Santa Catarina, Brazil.
Isabel Cristina G Bandeira
IC
de Andrade
Roberta Tarkany
RT
Basting
Ynara Bosco de Oliveira
YB
Lima-Arsati
Flávia Lucisano Botelho
FL
do Amaral
José Augusto
JA
Rodrigues
Fabiana Mantovani Gomes
FM
França
D000077463:Carbamide Peroxide; D003069:Coffee / Q000737:chemistry; D003116:Color; D004396:Coloring Agents / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D006801:Humans; D006813:Humidity; D006861:Hydrogen Peroxide / Q000737:chemistry; D007101:Immersion; D008422:Materials Testing; D053761:Nanocomposites / Q000737:chemistry*; D010545:Peroxides / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D058205:Tooth Bleaching Agents / Q000737:chemistry*; D014508:Urea / Q000031:analogs & derivatives / Q000737:chemistry; D014867:Water / Q000737:chemistry; D014920:Wine
D003069:Coffee; D004396:Coloring Agents; D003188:Composite Resins; D003764:Dental Materials; C474035:Filtek Supreme; D010545:Peroxides; D058205:Tooth Bleaching Agents; D014867:Water; D000077463:Carbamide Peroxide; D014508:Urea; D006861:Hydrogen Peroxide