title: [A comparison of color space of Vitapan 3D-Master shade guides to nature teeth from Nanjing population].
abstract: OBJECTIVE
  To study the fitness of color dimension between Vitapan 3D-Master shade guides and nature teeth.
  
  
  METHODS
  2,159 nature teeth from Nanjing population and Vitapan 3D-Master shade guides were analyzed by dental chromameter ShadeEye NCC on CIE L*a*b* color system.
  
  
  RESULTS
  1) The color dimension of natural teeth displayed a broader range than those from Vitapan 3D-Master shade guides. Comparing with incisor group, canine-premolar group had better fitness with Vitapan 3D-Master shade guides. 2) In color space, incisor values a* shifted toward green (-a*), while the shade guide values a* located toward red (+a*). The shade guide lacked tabs of values L* 71-78 and a* -1.5-(-)0.2 for natural incisor. 3) According to the perceptibility threshold AE*ab<1.4, the match rates with Vitapan 3D-Master shade guides was 33% in incisor group and 50% in canine-premolar group.
  
  
  CONCLUSIONS
  Vitapan 3D-Master shade guides had inferior match with nature teeth from Nanjing population, especially in incisor.
authors.affiliation: Dept. of Prosthodontics, Stomatological Hospital Affiliated School of Medicine, Nanjing University, Nanjing 210008, China.
authors.forename: Xiao-Lu
authors.initials: XL
authors.lastname: Zhou
authors.forename: Xiao-Ping
authors.initials: XP
authors.lastname: Luo
authors.forename: Xia
authors.initials: X
authors.lastname: Liu
mesh_terms: D003116:Color; D006801:Humans; D007180:Incisor; D008963:Molar; D017797:Prosthesis Coloring