title: [Strength of bi-layer dental ceramic evaluated by MSP testing].
abstract: OBJECTIVE
  To evaluate strength of bi-layer alumina/Y-TZP specimens, compared with 3-point bending test and to estimate the reliability of MSP testing used in dental ceramics.
  
  
  METHODS
  The single-layer/bi-layer alumina/Y-TZP specimens were produced by the clinical methods. Strength of these specimens was determined by MSP testing and 3-point bending test respectively. Fractured pieces of each bi-layer specimen were collected and studied with optical microscope and SEM.
  
  
  RESULTS
  The MSP fracture strength was lower than bending strength in all the specimens. The strength of single-layer Y-TZP was the highest and the strength of bi-layer samples was lower than that of the single-layer samples respectively. Delamination and interface destruction were found in bi-layer alumina specimens, and not in bi-layer Y-TZP specimens.
  
  
  CONCLUSIONS
  MSP testing is a convenient and feasible method to evaluate mechanical properties of dental ceramics.
authors.affiliation: Department of General Dentistry, Peking University School and Hospital of Stomatology, Beijing 100081, China. kqliuyh@163.com
authors.forename: Yi-Hong
authors.initials: YH
authors.lastname: Liu
authors.forename: Yan-Hong
authors.initials: YH
authors.lastname: Zhu
authors.forename: Qi-Huang
authors.initials: QH
authors.lastname: Deng
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry*; D003764:Dental Materials; D003776:Dental Porcelain / Q000737:chemistry; D003799:Dental Stress Analysis; D003801:Dental Veneers; D006801:Humans; D008422:Materials Testing / Q000379:methods*; 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; D000537:Aluminum Oxide