title: [Effects of try-in paste and luting agent on the resultant color of all-ceramic veneers].
abstract: OBJECTIVE
  The purposes of this study was to investigate the effects of luting agents on the resultant color of IPS e.max all-ceramic veneer restorations, and to evaluate the similarity of try-in pastes and the corresponding luting agents on the final color.
  
  
  METHODS
  Disc-shaped ceramic specimens were fabricated and seated on four shades of resin specimens to mimic the complex of ceramic veneer laying on tooth substrates. Try-in pastes and luting agents (Shades of TR, B0.5, A1, A3, W0) were applied into the inter-layer of ceramic and resin specimens, respectively. The color of the combinations was measured using a spectrophotometer and subsequently converted to CIE L*a*b* values. Color changes after luting agent applied, and between try-in paste and corresponding luting agent were calculated and registered as DeltaEresin and DeltaEpaste-resin.
  
  
  RESULTS
  DeltaEresin value of A2, A3 backgrounds was more than 1.0. DeltaEresin value of A4, A5 backgrounds was less than 1.0. The DeltaEpaste-resin value of A3 backgrounds was more than 1.0, whereas, A2 was less than 1.0 (except for shade W0). The DeltaEpaste-resin value of shade W0 was significantly different from other shades of luting agents.
  
  
  CONCLUSIONS
  The color of ceramic veneer restorations were affected by luting agents with A2, and A3 background colors. The agreement of the try-in paste and the corresponding luting agent was excellent for A2 background (except for W0).
authors: Key Laboratory for Oral Biomedical Engineering of Ministry of Education, Wuhan 430079, China.
authors: Bin-Ting
authors: BT
authors: Xu
authors: Qing
authors: Q
authors: Li
authors: Rong
authors: R
authors: Li
authors: Yi-Ning
authors: YN
authors: Wang