title: Effect ofartificial accelerated aging on color stability and surface roughness of indirect composites.
abstract: Direct and indirect composite resins have different forms of polymerization. Some materials require a post-cure system associating light and heat enhancing clinical properties. This study assessed the changes in color and surface roughness of three indirect composite resins after accelerated aging. Twelve specimens (15 x 2 mm) were obtained for each tested material. Subsequently, the first measurements for roughness tests and colorimetric spectrophotometry (CIE L*a*b* scale) were performed. Specimens were subject to accelerated aging for 384 hours. New measurements were then performed to evaluate the resulting change. Accelerated aging produced color change and increased surface roughness in all composite resins. Solidex resin showed color changes above the clinically accepted value (DeltaE = 4.31 +/- 0.22), and roughness values (Ra = 0.088 +/- 0.008 microm) statistically lower than that of Artglass (Ra = 0.141 +/- 0.026 microm) and Targis (Ra = 0.124 +/- 0.02 microm) (p<0.001). All the indirect resins tested showed color change and increased roughness after accelerated aging. Solidex showed color stability above a quantitative level considered clinically acceptable and lower roughness values compared to the other resins.
authors.affiliation: Departmento de Materiais Dentários e Prótese FORP-USP, São Paulo, Brasil.
authors.forename: Fabíola Rejane
authors.initials: FR
authors.lastname: Zanin
authors.forename: Lucas da Fonseca Roberti
authors.initials: Lda F
authors.lastname: Garcia
authors.forename: Luciana Assirati
authors.initials: LA
authors.lastname: Casemiro
authors.forename: Fernanda de Carvalho Panzeri
authors.initials: Fde C
authors.lastname: Pires-de-Souza
mesh_terms: D003116:Color; D003124:Colorimetry; D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D003764:Dental Materials / Q000737:chemistry* / Q000528:radiation effects; D003775:Dental Polishing; D005899:Glass Ionomer Cements / Q000737:chemistry / Q000528:radiation effects; D006801:Humans; D008422:Materials Testing; D012823:Silicate Cement / Q000737:chemistry / Q000528:radiation effects; D013053:Spectrophotometry; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry
chemical_list: C498018:Artglass (dental composite); D003188:Composite Resins; D003764:Dental Materials; D005899:Glass Ionomer Cements; C113676:Solidex; C111282:dental polyglass; D014867:Water; D012823:Silicate Cement