title: [Quantity of released nickel ion from Ni-Cr alloy of compound galvano-ceramic bridge].
abstract: OBJECTIVE
  To evaluate the biological safety of compound galvano-ceramic bridge by measuring the consistency of released nickel ion of the galvano-form slices cohered with Ni-Cr alloy slice specimens which were immersed in artificial saliva.
  
  
  METHODS
  Specimens were divided into five groups with four tests and one control. Test specimens were made into the structure like rectangle sandwich that one side of Ni-Cr alloy was cohered to the center surface of galvano golden base of 0.2 mm and another side was fused porcelain with the thickness of 0.3 mm (group A), 0.5 mm (group B), 1.0 mm (group C), and 0.3 mm (group D). And the Ni-Cr alloys were totally embedded in galvano golden base and firing porcelain. Naked Ni-Cr alloy was taken as control. Group D was immersed into acid artificial saliva (AS) with high fluoride, while others were in acid AS at 37 degrees C for 120 h. Then the consistency of released nickel ion in the solution was measured with inductively coupled plasma-atomic emission spectrometry (ICP-AES).
  
  
  RESULTS
  Nickel ions detected in the artificial saliva for the groups A, B, C, and D in acid AS with or without high fluoride were all under 0.005 mg/L Significant differences were found between each test group and the control [(0.65 +/- 0.45) mg/L].
  
  
  CONCLUSIONS
  Galvano-ceramic bridge, Ni-Cr alloy bridge with fused porcelain and golden base, shows biological safety responsible for the consistency of released nickel ion.
authors.affiliation: Department of Special Dentistry, The First Outpatient Dental Clinic, Peking University School and Hospital of Stomatology, Beijing, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.forename: Feng
authors.initials: F
authors.lastname: Sun
authors.forename: Hong
authors.initials: H
authors.lastname: Mao
authors.forename: Ya-li
authors.initials: YL
authors.lastname: Li
authors.forename: Hai-ming
authors.initials: HM
authors.lastname: Cheng
authors.forename: Ji-wen
authors.initials: JW
authors.lastname: Chen
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D003764:Dental Materials; D008422:Materials Testing; D016876:Metal Ceramic Alloys / Q000737:chemistry*; D009532:Nickel / Q000032:analysis*
chemical_list: D001672:Biocompatible Materials; D003764:Dental Materials; D016876:Metal Ceramic Alloys; D009532:Nickel