title: Chromatic stability of acrylic resins of artificial eyes submitted to accelerated aging and polishing.
abstract: Esthetics and durability of materials used to fabricate artificial eyes has been an important issue since artificial eyes are essential to restore esthetics and function, protect the remaining tissues and help with patients' psychological therapy. However, these materials are submitted to degrading effects of environmental agents on the physical properties of the acrylic resin.
  
  
  OBJECTIVE
  This study assessed the color stability of acrylic resins used to fabricate sclera in three basic shades (N1, N2 and N3) when subjected to accelerated aging, mechanical and chemical polishing.
  
  
  METHODS
  Specimens of each resin were fabricated and submitted to mechanical and chemical polishing. Chromatic analysis was performed before and after accelerated aging through ultraviolet reflection spectrophotometry.
  
  
  RESULTS
  All specimens revealed color alteration following polishing and accelerated aging. The resins presented statistically significant chromatic alteration (p<0.01) between the periods of 252 and 1008 h.
  
  
  CONCLUSIONS
  Both polishing methods presented no significant difference between the values of color derivatives of resins.
authors.affiliation: Department of Dental Materials and Prosthodontics, Araçatuba Dental School, São Paulo State University, Araçatuba, SP, Brazil. goiato@foa.unesp.br
authors.forename: Marcelo Coelho
authors.initials: MC
authors.lastname: Goiato
authors.forename: Daniela Micheline dos
authors.initials: DM
authors.lastname: Santos
authors.forename: Josiene Firmino
authors.initials: JF
authors.lastname: Souza
authors.forename: Amália
authors.initials: A
authors.lastname: Moreno
authors.forename: Aldiéris Alves
authors.initials: AA
authors.lastname: Pesqueira
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry* / Q000528:radiation effects; D000704:Analysis of Variance; D003116:Color; D005137:Eye, Artificial; D008422:Materials Testing; D017797:Prosthesis Coloring; D013499:Surface Properties; D013997:Time Factors; D014466:Ultraviolet Rays
chemical_list: D000180:Acrylic Resins