title: Effect of weathering and thickness on the opacity of acrylic resin and ocular button for artificial eyes.
abstract: The aim of this study was to evaluate the opacity of the polymethylmethacrylate for ocular prosthesis using an ocular button, a colorless resin for the ocular prostheses, and 4 brands of acrylic colorless resin in the function of weathering (0, 504, or 1008 h) and thickness (1 and 3.5 mm). One hundred twenty specimens were confectioned (made) and allocated into 12 groups (n = 10). Opacity analysis was carried out with a spectrophotometer of visible ultraviolet reflection before and after weathering by 504 and 1008 hours. Data for the opacity were expressed in DeltaE. Data were then analyzed statistically by analysis of variance and the Tukey test (P < 0.01). The data demonstrated statistically significant differences; manufactured ocular button (DeltaE = 47.4) and the resin Vipi Cril (DeltaE = 38.11) presented greater and minor values of opacity, respectively. The weathering showed statistical difference among times (0 h, DeltaE = 36.32; 504 h, DeltaE = 39.98; and 1008 h, DeltaE = 43.9). Ocular button and evaluated resins presented greater values of opacity when presented in 3.5 mm in thickness. The values of opacity increased with the progression of the time of weathering, independent of the evaluated material and the thickness.
authors.affiliation: University of Brasília, Barsília/DF, Brazil.
authors.forename: Aline Ursula Rocha
authors.initials: AU
authors.lastname: Fernandes
authors.forename: Marcelo Coelho
authors.initials: MC
authors.lastname: Goiato
authors.forename: Daniela Micheline
authors.initials: DM
authors.lastname: dos Santos
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000704:Analysis of Variance; D001672:Biocompatible Materials / Q000737:chemistry; D005137:Eye, Artificial; D006244:Hardness; D006801:Humans; D008420:Manufactured Materials; D008422:Materials Testing; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011474:Prosthesis Design; D013056:Spectrophotometry, Ultraviolet; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; D001672:Biocompatible Materials; D019904:Polymethyl Methacrylate