title: Agreement of try-in pastes and the corresponding luting composites on the final color of ceramic veneers.
abstract: OBJECTIVE
  The aims of this study were to evaluate the influence of luting composites on the final color of ceramic veneers and to investigate the color matching of try-in pastes to the corresponding luting composites.
  
  
  METHODS
  Ceramic discs (shade A3, 1.0 mm thick) were fabricated and seated on composite specimens (shade A3) to mimic a complex of ceramic veneer lying on dentin substrate. The try-in pastes and luting composites of 3M RelyX were applied into the interlayer of the ceramic and composite specimens. The colors of the complexes were measured using a spectrophotometer, and subsequently converted to CIE L*a*b* values. Color changes after luting composites were applied, and the changes between the try-in pastes and the corresponding luting composites were calculated and registered as ΔEluting and ΔEpaste-luting . Color measurements were repeated while the ceramic specimens were reduced to 0.7 mm and then 0.5 mm in thickness.
  
  
  RESULTS
  The means of ΔEluting were 0.69 ± 0.21, 1.27 ± 0.48, and 1.40 ± 0.57 for the 1.0, 0.7, and 0.5 mm thicknesses, respectively. Two-way ANOVA revealed that ΔEpaste-luting values were significantly affected by the colors of luting composites and veneer thickness (p < 0.001). Lighter shades of luting composites showed less influence on ΔEpaste-luting values.
  
  
  CONCLUSIONS
  Luting composites could slightly modify the final color of ceramic veneers. Color matching of a try-in paste to the corresponding luting composite was not always achieved in the 0.7 or 0.5 mm thicknesses.
authors.affiliation: Postgraduate Student, School and Hospital of Stomatology, Wuhan University, Wuhan, China.
authors.forename: Binting
authors.initials: B
authors.lastname: Xu
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Chen
authors.forename: Rong
authors.initials: R
authors.lastname: Li
authors.forename: Yining
authors.initials: Y
authors.lastname: Wang
authors.forename: Qing
authors.initials: Q
authors.lastname: Li
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry; D003801:Dental Veneers; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D055115:Light-Curing of Dental Adhesives / Q000379:methods; D008422:Materials Testing; D011312:Pressure; D019279:Resin Cements / Q000737:chemistry*; D013053:Spectrophotometry / Q000295:instrumentation; D013499:Surface Properties
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D005899:Glass Ionomer Cements; C528569:Rely-X; D019279:Resin Cements; C084550:Vitremer; C106662:amelogen; C493120:lithia disilicate; D003776:Dental Porcelain; C023506:Glass ceramics
keywords: Ceramic veneer; color difference; luting composite; try-in paste