title: [Influence of background color on four veneered dental ceramic core material].
abstract: OBJECTIVE
  To investigate the influence of background color on veneered In-Ceram and Cercon dental ceramics including Vita In-Ceram Electroformed Alumina (AL2), Electroformed Zirconia (Z21), Cercon base color Zirconia and Cercon base Zirconia.
  
  
  METHODS
  The colorimetric values of all the materials on noble metal, Ni-Cr alloy, silver amalgam and resin background were measured with a spectrocolorimeter, and the color difference among the groups was calculated.
  
  
  RESULTS
  After veneered, the color difference of Z21 Electroformed Zirconia was more distinct against the background of silver amalgam than against the backgrounds of noble metal and resin, but the color differences of the 4 veneered dental ceramics against different backgrounds were unidentifiable by human eyes (δE<1.5).
  
  
  CONCLUSIONS
  After veneered, AL2 electroformed alumina, Z21 electroformed zirconia, Cercon base Zirconia and Cercon base color Zirconia are less influenced by the background color, and covering the background color is therefore not necessary.
authors.affiliation: Department of Stomatology, General Hospital of PLA, Beijing, China. lyh_720@sina.com
authors.forename: Yihan
authors.initials: Y
authors.lastname: Liu
authors.forename: Hongchen
authors.initials: H
authors.lastname: Liu
authors.forename: Longquan
authors.initials: L
authors.lastname: Shao
authors.forename: Ning
authors.initials: N
authors.lastname: Wen
authors.forename: Yuanfu
authors.initials: Y
authors.lastname: Yi
mesh_terms: D003116:Color; D003764:Dental Materials; D017267:Dental Prosthesis Design
chemical_list: D003764:Dental Materials