title: Color Stability of CAD/CAM Fabricated Inlays after Accelerated Artificial Aging.
abstract: OBJECTIVE
  To investigate the influence of accelerated artificial aging on the color stability of three different inlay restorations produced with a CAD/CAM system.
  
  
  METHODS
  Thirty non-carious human mandibular molar teeth were used. The teeth were embedded in autopolymerizing acrylic resin blocks. Standard Class I inlay cavities were prepared, and the teeth were randomly divided into three groups (n = 10) to fabricate inlay restorations: (1) a feldspathic-ceramic group, (2) a resin nano-ceramic group, and (3) a leucite glass-ceramic group. Optical impressions were made with CEREC software, and the restorations were designed and then milled. The inlays were adhesively cemented with a dual-polymerizing resin cement and left in distilled water at room temperature for 1 week. Color measurements were performed with a spectrophotometer before and after accelerated aging in a weathering machine with a total energy of 150 kJ/m(2) . Changes in color (∆E, ∆L, ∆a, ∆b, ∆C) were determined using the CIE L*a*b* system. The results were assessed using a one-way ANOVA and Tukey's HSD test (p = 0.05).
  
  
  RESULTS
  The color changes of the materials ranged from 2.1 to 9.29. The highest color change was seen in the resin nano-ceramic material. This change was not clinically acceptable (∆E > 5.5). No significant differences were found in the ∆L and ∆a values of the test groups.
  
  
  CONCLUSIONS
  Color changes were observed in each evaluated material after accelerated aging. All CAD/CAM inlays became darker in appearance, more saturated, a little reddish, and more yellow.
authors.affiliation: Private Practice, Denizli, Turkey.
authors.forename: Isil
authors.initials: I
authors.lastname: Karaokutan
authors.affiliation: Department of Prosthodontics, Selcuk University Faculty of Dentistry, Konya, Turkey.
authors.forename: Tuba
authors.initials: T
authors.lastname: Yilmaz Savas
authors.affiliation: Department of Prosthodontics, Selcuk University Faculty of Dentistry, Konya, Turkey.
authors.forename: Filiz
authors.initials: F
authors.lastname: Aykent
authors.affiliation: Department of Prosthodontics, Selcuk University Faculty of Dentistry, Konya, Turkey.
authors.forename: Eda
authors.initials: E
authors.lastname: Ozdere
mesh_terms: D003116:Color; D017076:Computer-Aided Design; D003776:Dental Porcelain; D006801:Humans; D007284:Inlays; D019279:Resin Cements
chemical_list: D019279:Resin Cements; D003776:Dental Porcelain
keywords: CAD/CAM; Ceramic; accelerated aging; color stability; inlay