title: Effect of ultraviolet aging on translucency of resin-cemented ceramic veneers: an in vitro study.
abstract: OBJECTIVE
  The aim of this in vitro study was to evaluate the translucency of ceramic veneers cemented with light- or dual-cured resin cements after accelerated aging.
  
  
  METHODS
  A total of 392 specimens were made of shade A1 with 0.5- and 1.0-mm thickness. Light-cured RelyX Veneer and dual-cured Maxcem Elite and Variolink II resin cements were applied on the porcelain discs with a thickness of 0.1 mm. Translucency parameter (TP) values of the ceramic veneers after cementation and UV aging test were evaluated. Statistical analyses were done with ANOVA and Tukey's tests and paired sample t-test (p < 0.05).
  
  
  RESULTS
  All the resin cements affected the TP values of 0.5-mm-thick ceramic, while RelyX Veneer Tr (TP = 11.15; p = 0.608), Variolink II Tr (TP = 10.98; p = 0.55), and Maxcem Clear (TP = 11.81; p = 0.702) did not affect the translucency of 1-mm-thick ceramics (TP = 11.38). The aging process affected TP values of both ceramics and cemented ceramics, as the TP values decreased after aging. Among the TP values of opaque shade resin cements, there were significant differences between the "ceramic," "ceramic + RelyX Veneer WO," "ceramic + Variolink II WO," and "ceramic + Maxcem WO" variables for both 0.5 and 1 mm thicknesses (p < 0.05). There were no significant differences between "ceramic," "ceramic + RelyX Veneer Tr," "ceramic + Variolink II Tr," and "ceramic + Maxcem Clear" variables at 0.5 mm thickness, and there were no significant differences between "ceramic," "ceramic + RelyX Veneer Tr," and "ceramic + Variolink II Tr" variables after aging (p > 0.05).
  
  
  CONCLUSIONS
  The TP of the same color of resin cements varied related to the type or brand. Aging caused both the ceramics and cemented ceramics to become more opaque.
authors.affiliation: Department of Prosthodontics, Karadeniz Technical University, Faculty of Dentistry, Trabzon, Turkey.
authors.forename: Sedanur
authors.initials: S
authors.lastname: Turgut
authors.forename: Bora
authors.initials: B
authors.lastname: Bagis
authors.forename: Suha S
authors.initials: SS
authors.lastname: Turkaslan
authors.forename: Yildirim Hakan
authors.initials: YH
authors.lastname: Bagis
mesh_terms: D000179:Acrylates / Q000737:chemistry; D002484:Cementation / Q000379:methods; D003116:Color; D003738:Dental Cements / Q000737:chemistry; D003776:Dental Porcelain / Q000737:chemistry / Q000528:radiation effects*; D003801:Dental Veneers; D006801:Humans; D006813:Humidity; D008027:Light; D055115:Light-Curing of Dental Adhesives / Q000379:methods; D008422:Materials Testing; D019279:Resin Cements / Q000737:chemistry / Q000528:radiation effects*; D055116:Self-Curing of Dental Resins / Q000379:methods; D013696:Temperature; D014466:Ultraviolet Rays
chemical_list: D000179:Acrylates; C554641:Adper single bond 2; D003738:Dental Cements; C508050:IPS e.max Press; C515955:Maxcem; C076808:Monobond S; C528569:Rely-X; D019279:Resin Cements; C493120:lithia disilicate; D003776:Dental Porcelain; C103502:Variolink; C040415:heliobond
keywords: Esthetics; aging; ceramics; resin cement