title: The influence of resin cements on the final color of ceramic veneers.
abstract: OBJECTIVE
  To evaluate the effect of three brands of resin cement on the final color of ceramic veneers.
  
  
  METHODS
  50 disk-shaped ceramic specimens (IPS e.Max, 0.6mm×8.0mm diameter) and disk-shaped composite resin background specimens (4.0mm×8.0mm diameter) were prepared and divided into 10 groups (n=5). These paired specimens were bonded using ten shades of resin cement (Variolink Veneer, shades LV-3, LV-2, MV, HV+2, HV+3; Panavia F, shades light and brown; and RelyX™ Veneer, shades WO, TR, A3). A spectrophotometer (VITA Easyshade) was used to measure the color parameters (CIE L*a*b* values) of the paired disks before and after cementation. The color differences (ΔE values) after cementation were calculated and statistically analyzed by the One-way ANOVA (at the significant level p<0.05).
  
  
  RESULTS
  The color parameters of the ceramic disks were measured in terms of the increase in L* value, and the decrease in Cab(*) value after bonding with the resin cement. The ΔE values of ceramic disks after cementation ranged from 1.38 to 7.16. The ΔE values were more than 3.3 when the ceramic disks were cemented with resin cements in shade HV+3 (4.90) and shade WO (7.16). One-way ANOVA of ΔE values revealed significant differences in the resin cement shades.
  
  
  CONCLUSIONS
  Resin cements can affect the final color of ceramic veneer restorations, and the extent of this effect varies according to the resin cement shades.
authors.affiliation: The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China; Department of Prosthetics, Dalian Stomatological Hospital, Dalian, China.
authors.forename: Xiao-Dong
authors.initials: XD
authors.lastname: Chen
authors.affiliation: Liaison Center for Innovative Dentistry, Graduate School of Dentistry, Tohoku University, Sendai, Japan.
authors.forename: Guang
authors.initials: G
authors.lastname: Hong
authors.affiliation: Department of Prosthetics, Dalian Stomatological Hospital, Dalian, China.
authors.forename: Wen-Zhong
authors.initials: WZ
authors.lastname: Xing
authors.affiliation: The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China. Electronic address: wang.yn@whu.edu.cn.
authors.forename: Yi-Ning
authors.initials: YN
authors.lastname: Wang
mesh_terms: D002516:Ceramics; D003116:Color; D003188:Composite Resins; D003738:Dental Cements; D003801:Dental Veneers; D017797:Prosthesis Coloring; D019279:Resin Cements; D013053:Spectrophotometry
chemical_list: D003188:Composite Resins; D003738:Dental Cements; D019279:Resin Cements
keywords: Ceramic veneers; Color differences; Resin cement