title: [Effect of pigmentation on the strength of dental Y-TZP/porcelain bilayered structure].
abstract: OBJECTIVE
  To investigate the effect of two methods of pigmentation on the flexural strength of dental Y-TZP/porcelain layered structure.
  
  
  METHODS
  KaVo zirconia substructures were pigmented by dipping presintered blocks in the coloring solution VITA LL1 and LL5, and colored TZ-3YS zirconia substructures were fabricated by adding pigments before isostatic pressing. The colors No.1 and No.5 were used for the test. The specimens were made in monolithic or bilayered forms, and the flexural strength was tested. XRD and SEM with EDX were used to analyze the characteristics of the surface structure.
  
  
  RESULTS
  In KaVo group, no significant differences were found in the flexural strength between white and LL1 and LL5 colored monoclinic materials, nor in bilayered structures. While in TZ-3YS group, significant differences were noted in the flexural strength between color No.5 white and color No.1 monoclinic materials, but not between the latter two subgroups. The flexural strength was significantly lowered by veneering with porcelain in both zirconia groups, and similar findings were observed with the monoclinic materials. Only the tetragonal phase was detected in both of the zirconia groups.
  
  
  CONCLUSIONS
  Pigmentation has no apparent effects on the bonding strength between the veneering porcelain and zirconia. Both coloring methods are appropriate when the concentration of the pigments is under deliberate control.
authors.affiliation: Department of Prosthodontics, General Hospital of PLA, Beijing 100853, China. 93111498@163.com
authors.forename: Ting-ting
authors.initials: TT
authors.lastname: Ma
authors.forename: Yuan-fu
authors.initials: YF
authors.lastname: Yi
authors.forename: Long-quan
authors.initials: LQ
authors.lastname: Shao
authors.forename: Hong-chen
authors.initials: HC
authors.lastname: Liu
authors.forename: Jie-mo
authors.initials: JM
authors.lastname: Tian
authors.forename: Kang-lin
authors.initials: KL
authors.lastname: Hou
authors.forename: Wei-wei
authors.initials: WW
authors.lastname: Zhang
authors.forename: Ning
authors.initials: N
authors.lastname: Wen
authors.forename: Bin
authors.initials: B
authors.lastname: Deng
mesh_terms: D001840:Dental Bonding; D003764:Dental Materials; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis; D003801:Dental Veneers; D008422:Materials Testing; D010858:Pigmentation; D013718:Tensile Strength; D015019:Yttrium / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D003764:Dental Materials; C499362:yttria stabilized tetragonal zirconia; D003776:Dental Porcelain; D015019:Yttrium; D015040:Zirconium