title: [Sintering behavior of tooth-like yttria-stabilized tetragonal zirconia polycrystal by adding rare-earth oxide].
abstract: OBJECTIVE
  To investigate the influence on the sintering densification, microstructure and transformation behavior of tooth-like yttria-stabilized tetragonal zirconia polycrystal by adding rare-earth oxide as colorants.
  
  
  METHODS
  Six kinds(S1,S2,S3,S4,S5,S6) of tooth-like yttria stabilized tetragonal zirconia polycrystal(Y-TZP)were made by introducing internal colorating technology, the relative density of sintered specimens was determined by the Archimedes method. Scanning electron microscope (SEM) was used to examine the surface morphology and determine the grain size. The phase identification of sintered samples was carried out by X-ray diffractometer.
  
  
  RESULTS
  The relative density of the six kinds of tooth-like yttria stabilized tetragonal zirconia polycrystal were over 98%, through SEM images of the cross-sectional surfaces, the grain size of the six kinds of sintered composites were observed in a wide range from 100 nm to 300 nm, a second phase was not detected in the grain boundaries. The diffraction peaks of the main phase were observed as tetragonal phase.
  
  
  CONCLUSIONS
  Tooth-like yttria-stabilized tetragonal zirconia polycrystal was acquired with better mechanical property by adding rare-earth oxide as colorants, and was available for clinical application.
authors.affiliation: Department of Prosthodontics, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine; Shanghai Key Laboratory of Stomatology. Shanghai 200011, China. E-mail:drgaoyan@gmail.com.
authors.forename: Yan
authors.initials: Y
authors.lastname: Gao
authors.affiliation: Department of Prosthodontics, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine; Shanghai Key Laboratory of Stomatology. Shanghai 200011, China.
authors.forename: Fu-qiang
authors.initials: FQ
authors.lastname: Zhang
authors.affiliation: Shanghai Institute of Ceramics, Chinese Academy of Sciences. Shanghai 200050,China.
authors.forename: Jian-hua
authors.initials: JH
authors.lastname: Gao
mesh_terms: D003430:Cross-Sectional Studies; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D008422:Materials Testing; D008674:Metals, Rare Earth / Q000737:chemistry*; D010087:Oxides; D015019:Yttrium / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D008674:Metals, Rare Earth; D010087:Oxides; D003776:Dental Porcelain; D015019:Yttrium; D015040:Zirconium; C028541:zirconium oxide; C091417:yttria