title: Hardness evaluation of prosthetic silicones containing opacifiers following chemical disinfection and accelerated aging.
abstract: We evaluated the effects of disinfection and aging on the hardness of silicones containing opacifiers and intended for use in facial prosthetics. A total of 90 samples were produced using a cylindrical metal mold 3 mm in height and 30 mm in diameter. The samples were fabricated from Silastic MDX 4-4210 silicone in three groups: GI contained no opacifier, GII contained barium sulfate (Ba), and GIII contained titanium dioxide (Ti). The samples were disinfected using effervescent tablets (Ef), neutral soap (Ns), or 4% chlorhexidine (Cl) 3 times a week for 60 days. After this period the samples underwent 1,008 hours of accelerated aging. The hardness was measured using a durometer immediately following the disinfection period and after 252, 504, and 1,008 hours of aging. The data were statistically analyzed using 3-way ANOVA and the Tukey test (p < .05). The GIII group exhibited the greatest variation in hardness regardless of elapsed time. All groups displayed greater hardness after 1,008 hours of accelerated aging independent of disinfectant type. All of the hardness values were within the clinically acceptable range.
authors.affiliation: Department of Dental Materials and Prosthodontics, Araçatuba Dental School, São Paulo State University, Araçatuba, São Paulo, Brazil. goiato@foa.unesp.br
authors.forename: Marcelo Coelho
authors.initials: MC
authors.lastname: Goiato
authors.forename: Marcela Filié
authors.initials: MF
authors.lastname: Haddad
authors.forename: Daniela Micheline dos
authors.initials: DM
authors.lastname: Santos
authors.forename: Aldiéris Alves
authors.initials: AA
authors.lastname: Pesqueira
authors.forename: Amália
authors.initials: A
authors.lastname: Moreno
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry; D001466:Barium Sulfate / Q000737:chemistry; D004129:Dimethylpolysiloxanes / Q000737:chemistry* / Q000627:therapeutic use; D004203:Disinfection; D006245:Hardness Tests; D008422:Materials Testing; D008447:Maxillofacial Prosthesis; D013499:Surface Properties / Q000187:drug effects; D013997:Time Factors; D014025:Titanium / Q000737:chemistry
chemical_list: D000890:Anti-Infective Agents; D004129:Dimethylpolysiloxanes; D001466:Barium Sulfate; D014025:Titanium