title: [Evaluation of the esthetic effect of resin cements on the final color of ceramic veneer restorations].
abstract: OBJECTIVE
  To evaluate the influence of various shades of resin cements on the final color of an improved lithium-disilicate pressed glass ceramic veneers and analyze the agreement of resin cements and corresponding try-in pastes.
  
  
  METHODS
  Forty-eight artificial maxillary central incisor teeth were sequenced according to the measured color parameters and divided at random into 8 groups (n = 6). These artificial teeth were prepared following veneer preparation protocol. An improved lithium- disilicate pressed glass ceramic materials (IPS e.max Press, Ivoclar Vivadent) were selected as the veneer material. The shape and curvature of each veneer wax pattern were duplicated with the same impression to guarantee the similarity. The ceramic veneer specimens were delivered on the artificial teeth using the corresponding try-in pastes of 8 shades (Variolink Veneer, shades of LV-3, LV-2, MV, HV+2, HV+3; and 3M RelyXTM Veneer, shades of WO, TR, A3) and bonded with the resin cements. A clinical spectrophotometer was used to measure the color parameters of the ceramic veneers before the try-in, during the try-in procedure, and after cementation. ΔE values and C*ab values were calculated.
  
  
  RESULTS
  The result of one-way ANOVA indicated that the color changes of ceramic veneer cementation with resin cements were statistically significantly different in the shades of resin cements (P < 0.001). The ΔE values of ceramic veneer after cementation ranged from 0.93 to 6.79. The color changes of ceramic veneer specimens using the shades of LV-3, HV+3, WO were 3.31, 4.90 and 6.79, respectively (ΔE>3.3). The ΔE values of the ceramic veneer specimens between the resin cements and corresponding try-in pastes were from 0.72 to 1.79 (except the shade of HV+3).
  
  
  CONCLUSIONS
  The LV-3, HV+3, WO shades were able to change the final color of a ceramic veneer. The color of resin cements and corresponding try-in pastes achieved high agreement (except the shade of HV+3).
authors.affiliation: The State Key Laboratory Breeding Base of Basic Science of Stomatology & Key Laboratory of Oral Biomedicine Ministry of Education, School of Stomatology, Wuhan University, Wuhan 430079, China.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Chen
authors.forename: Shaopu
authors.initials: S
authors.lastname: Zhang
authors.forename: Wenzhong
authors.initials: W
authors.lastname: Xing
authors.forename: Kangru
authors.initials: K
authors.lastname: Zhan
authors.affiliation: Department of Prosthodontics, School of Stomatology, Wuhan University, Wuhan 430079, China, Email: wang.yn@whu.edu.cn.
authors.forename: Yining
authors.initials: Y
authors.lastname: Wang
mesh_terms: D000180:Acrylic Resins; D000704:Analysis of Variance; D002484:Cementation; D002516:Ceramics; D003116:Color; D003188:Composite Resins; D003776:Dental Porcelain; D003801:Dental Veneers; D004955:Esthetics, Dental; D006801:Humans; D007180:Incisor; D011140:Polyurethanes; D019279:Resin Cements
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; C508050:IPS e.max Press; D011140:Polyurethanes; D019279:Resin Cements; C513703:Vivadent; C493120:lithia disilicate; D003776:Dental Porcelain; C103502:Variolink; C023506:Glass ceramics