title: Color stability of maxillofacial silicone with nanoparticle pigment and opacifier submitted to disinfection and artificial aging.
abstract: The purpose of this study was to evaluate the color stability of a maxillofacial elastomer with the addition of a nanoparticle pigment and∕or an opacifier submitted to chemical disinfection and artificial aging. Specimens were divided into four groups (n = 30): group I: silicone without pigment or opacifier, group II: ceramic powder pigment, group III: Barium sulfate (BaSO(4)) opacifier, and group IV: ceramic powder and BaSO(4) opacifier. Specimens of each group (n = 10) were disinfected with effervescent tablets, neutral soap, or 4% chlorhexidine gluconate. Disinfection was done three times a week during two months. Afterward, specimens were submitted to different periods of artificial aging. Color evaluation was initially done, after 60 days (disinfection period) and after 252, 504, and 1008 h of artificial aging with aid of a reflection spectrophotometer. Data were analyzed by three-way ANOVA and Tukey test (α = 0.05). The isolated factor disinfection did not statistically influence the values of color stability among groups. The association between pigment and BaSO(4) opacifier (GIV) was more stable in relationship to color change (△E). All values of △E obtained, independent of the disinfectant and the period of artificial aging, were considered acceptable in agreement with the norms presented in literature.
authors.affiliation: UNESP, Araçatuba Dental School, Department of Dental Materials and Prosthodontics, Rua José Bonifácio, 1193. CEP 16015-050. Araçatuba, SP, Brazil.
authors.forename: Marcela
authors.initials: M
authors.lastname: Filié Haddad
authors.forename: Marcelo
authors.initials: M
authors.lastname: Coelho Goiato
authors.forename: Daniela
authors.initials: D
authors.lastname: Micheline Dos Santos
authors.forename: Amália
authors.initials: A
authors.lastname: Moreno
authors.forename: Nuno
authors.initials: N
authors.lastname: Filipe D'almeida
authors.forename: Aldiéris
authors.initials: A
authors.lastname: Alves Pesqueira
mesh_terms: D000704:Analysis of Variance; D002710:Chlorhexidine / Q000494:pharmacology; D004396:Coloring Agents / Q000737:chemistry*; D004202:Disinfectants / Q000494:pharmacology; D004355:Drug Stability; D008422:Materials Testing; D008447:Maxillofacial Prosthesis; D053758:Nanoparticles / Q000737:chemistry*; D017797:Prosthesis Coloring; D012826:Silicone Elastomers / Q000737:chemistry*; D012915:Soaps / Q000494:pharmacology; D013053:Spectrophotometry; D013997:Time Factors
chemical_list: D004396:Coloring Agents; D004202:Disinfectants; D012826:Silicone Elastomers; D012915:Soaps; D002710:Chlorhexidine