title: Effect of surface treatment on shear bond strength of zirconia to human dentin.
abstract: OBJECTIVE
  The effect of surface treatment using tribochemical silica coating/silane coupling on the shear bond strengths of (1) a glass-infiltrated, zirconia-reinforced alumina (In-Ceram Zirconia) and (2) a yttria-stabilized zirconia ceramic (YZ Zirconia) to human dentin was studied.
  
  
  METHODS
  Twelve specimens of each ceramic were randomly assigned to one of three surface treatments: (1) no surface treatment (control group); (2) a chairside tribochemical silica coating/silane coupling system (CoJet group); and (3) a laboratory tribochemical silica coating/silane coupling system (Rocatac group). The mode of failure of each specimen was determined under magnification.
  
  
  RESULTS
  The shear bond strengths (mean ± SD) of In-Ceram Zirconia of the control, CoJet and Rocatec groups were 5.7 ± 4.3 MPa, 11.4 ± 5.4 MPa, and 6.5 ± 4.8 MPa, respectively. The corresponding figures for YZ Zirconia were 8.2 ± 5.4 MPa, 9.8 ± 5.4 MPa, and 7.8 ± 4.7 MPa. Two-way ANOVA revealed significant differences in bond strength due to the difference in surface treatment (p= 0.02), but the bond strengths between the two ceramics were not significantly different (p= 0.56). Post hoc tests showed that In-Ceram Zirconia treated with CoJet had significantly higher shear bond strengths than those untreated (p < 0.05) or treated with Rocatec (p < 0.05). Surface treatment did not affect the shear bond strength of YZ Zirconia significantly (p > 0.05).
  
  
  CONCLUSIONS
  The bonding of In-Ceram Zirconia can be improved by the chairside surface treatment system.
authors.affiliation: Northwestern University, Evanston, IL, USA.
authors.forename: John
authors.initials: J
authors.lastname: Chai
authors.forename: Frederick C S
authors.initials: FC
authors.lastname: Chu
authors.forename: Tak W
authors.initials: TW
authors.lastname: Chow
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002484:Cementation / Q000379:methods; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D045662:Dental Etching / Q000379:methods; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry; D015019:Yttrium / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry*
chemical_list: D003738:Dental Cements; D017220:Dentin-Bonding Agents; C448319:ESPE bonding system; C485633:In-Ceram Zirconia; C438843:Panavia-Fluoro; D019279:Resin Cements; C076811:Rocatec; D012821:Silanes; C499362:yttria stabilized tetragonal zirconia; D014867:Water; D003776:Dental Porcelain; D017438:Bisphenol A-Glycidyl Methacrylate; D015019:Yttrium; D012822:Silicon Dioxide; C081713:Visio-Bond; D015040:Zirconium; D000537:Aluminum Oxide; C028541:zirconium oxide