title: Effect of disinfection and accelerated aging on color stability of colorless and pigmented facial silicone.
abstract: OBJECTIVE
  The aim of this study was to evaluate the color stability of a facial silicone with different pigmentations submitted to disinfection and accelerated aging.
  
  
  METHODS
  Sixty replicas were fabricated with the silicone Silastic MDX 4-4210 and divided into three groups: no pigmentation, pigmentation with makeup powder, and pigmentation with ceramic powder. Half the replicas of each group were submitted to disinfection with Efferdent and the other with neutral soap for 60 days (n = 10). After this period, all replicas were inserted in a chamber for accelerated aging of nonmetallic specimens. The color measurements were carried out initially, after disinfection, and after accelerated aging (252, 504, 1008 hours). Color stability was evaluated through spectrophotometry. The values were submitted to ANOVA and the means to Tukey's test (p < 0.01).
  
  
  RESULTS
  The specimens disinfected with neutral soap exhibited higher ΔE values regardless of the type of pigmentation. The colorless replicas and the specimens pigmented with ceramic exhibited a statistically significant difference between the methods of disinfection in all periods. The specimens pigmented with makeup powder did not demonstrate a statistically significant difference.
  
  
  CONCLUSIONS
  The ceramic pigment presented greater color stability regardless of disinfection and period. On the other hand, the makeup pigment exhibited the highest values of chromatic alteration.
authors.affiliation: Private Practice, Araçatuba, Brazil  Department of Dental Materials and Prosthodontics, UNESP, São Paulo State University, Araçatuba, Brazil  Division of Restorative Dentistry, Division of Dental Materials, State University of Campinas, Piracicaba School of Dentistry, Piracicaba, Brazil.
authors.forename: Aldiéris Alves
authors.initials: AA
authors.lastname: Pesqueira
authors.forename: Marcelo Coelho
authors.initials: MC
authors.lastname: Goiato
authors.forename: Daniela Micheline
authors.initials: DM
authors.lastname: dos Santos
authors.forename: Marcela Filié
authors.initials: MF
authors.lastname: Haddad
authors.forename: Paula do Prado
authors.initials: Pdo P
authors.lastname: Ribeiro
authors.forename: Mário Alexandre
authors.initials: MA
authors.lastname: Coelho Sinhoreti
authors.forename: Maria Lúcia Marçal Mazza
authors.initials: ML
authors.lastname: Sundefeld
mesh_terms: D003124:Colorimetry; D004129:Dimethylpolysiloxanes; D004202:Disinfectants; D004203:Disinfection / Q000379:methods; D004781:Environmental Exposure; D008422:Materials Testing; D008447:Maxillofacial Prosthesis; D017797:Prosthesis Coloring / Q000379:methods; D012826:Silicone Elastomers; D012915:Soaps; D013053:Spectrophotometry
chemical_list: D004129:Dimethylpolysiloxanes; D004202:Disinfectants; C020964:MDX 4-4210; D012826:Silicone Elastomers; D012915:Soaps