title: The influence of pigments on the slow crack growth in dental zirconia.
abstract: OBJECTIVE
  Partially yttria stabilized zirconium oxide was introduced as core material for core-veneered full ceramic dental restorations, because of its biological inertness, high mechanical strength, and toughness. In order to improve the esthetical possibilities pigments in the core are introduced, that might influence the stabilization by yttrium.
  
  
  METHODS
  Double torsion tests were performed to study the influence of the pigments in the core ceramics on its fracture toughness.
  
  
  RESULTS
  A significant difference was observed in the stress intensity factor (K(10)) as well as in the R-curve behavior between the ceramic with and without pigment.
  
  
  CONCLUSIONS
  The lower stress intensity factor for the ceramic with pigment could affect the clinical performance of dental zirconia restorations with this material.
authors.affiliation: Dental Biomaterials Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.
authors.forename: Moustafa N
authors.initials: MN
authors.lastname: Aboushelib
authors.forename: Niek
authors.initials: N
authors.lastname: de Jager
authors.forename: Cees J
authors.initials: CJ
authors.lastname: Kleverlaan
authors.forename: Albert J
authors.initials: AJ
authors.lastname: Feilzer
mesh_terms: D004396:Coloring Agents / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis / Q000379:methods*; D003801:Dental Veneers; D055119:Elastic Modulus; D020342:Finite Element Analysis; D008422:Materials Testing / Q000379:methods; D054159:Torsion, Mechanical; D015019:Yttrium / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; C499362:yttria stabilized tetragonal zirconia; D003776:Dental Porcelain; D015019:Yttrium; D015040:Zirconium