title: Preliminary investigation of a novel retentive system for hydrofluoric acid etch-resistant dental ceramics.
abstract: BACKGROUND
  A potential limitation to clinical use of In-Ceram and In-Ceram Spinell dental ceramics has been the inability to etch fit surfaces.
  
  
  OBJECTIVE
  This study investigated a novel retentive system for In-Ceram and In-Ceram Spinell ceramics.
  
  
  METHODS
  The system, Bateman etch retention system, relies on incorporation of plastic chips on the surface of a specimen. The plastic chips were subsequently burnt-out to leave pits on the fitting surface of the ceramic restoration. The effect of these surface pits on flexural strength of test specimens was compared with unetched and sandblasted samples. Shear bond strengths between clean and saliva contaminated samples and Panavia TC resinous cement were also determined.
  
  
  RESULTS
  The Bateman etch retention system significantly reduced the flexural strength of both In-Ceram and Spinell ceramic specimens compared with unetched and sandblasted samples (p < 0.05). No significant differences were discovered between shear bond strengths of uncontaminated Bateman etch retention system and sandblasted samples. However, mean shear bond strengths of saliva-contaminated Bateman etch retention system In-Ceram samples were substantially greater than those of saliva contaminated sandblasted samples (p < 0.05).
  
  
  CONCLUSIONS
  The Bateman etch retention system method should be the subject of additional investigation.
authors.affiliation: Department of Biomaterials, King's Dental Institute, London, United Kingdom.
authors.forename: D J
authors.initials: DJ
authors.lastname: Wood
authors.forename: N L
authors.initials: NL
authors.lastname: Bubb
authors.forename: B J
authors.initials: BJ
authors.lastname: Millar
authors.forename: S M
authors.initials: SM
authors.lastname: Dunne
mesh_terms: D000537:Aluminum Oxide; D001840:Dental Bonding / Q000379:methods*; D003776:Dental Porcelain; D008277:Magnesium Oxide; D008422:Materials Testing; D008689:Methacrylates; D018583:Pliability; D019279:Resin Cements; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D008689:Methacrylates; D019279:Resin Cements; D003776:Dental Porcelain; C070870:In-Ceram; C091744:Panavia TC; D008277:Magnesium Oxide; D000537:Aluminum Oxide