title: Shear bond strength of a ceramic to Co-Cr alloys.
abstract: BACKGROUND
  Different combinations of Co-Cr alloys bonded to ceramic have been used in dentistry; however, the bond strength of ceramic to metal can vary because of different compositions of these alloys.
  
  
  OBJECTIVE
  The purpose of this study was to evaluate the shear bond strength of a dental ceramic to 5 commercially available Co-Cr alloys.
  
  
  METHODS
  Five Co-Cr alloys (IPS d.SIGN 20, IPS d.SIGN 30, Remanium 2000, Heranium P, and Wirobond C) were tested and compared to a control group of an Au-Pd alloy (Olympia). Specimen disks, 5 mm high and 4 mm in diameter, were fabricated with the lost-wax technique. Sixty specimens were prepared using opaque and dentin ceramics (VITA Omega 900), veneered, 4 mm high and 4 mm in diameter, over the metal specimens (n=10). The shear bond strength test was performed in a universal testing machine with a crosshead speed of 0.5 mm/min. After shear bond testing, fracture surfaces were evaluated in a stereomicroscope under x25 magnification. Ultimate shear bond strength (MPa) data were analyzed with 1-way ANOVA and the Tukey HSD test (alpha =.05).
  
  
  RESULTS
  The mean (SD) bond strengths (MPa) were: 61.4 (7.8) for Olympia; 94.0 (18.9) for IPS 20; 96.8 (10.2) for IPS 30; 75.1 (12.4) for Remanium; 71.2 (14.3) for Heranium P; and 63.2 (10.9) for Wirobond C. Mean bond strengths for IPS 20 and IPS 30 were not significantly different, but were significantly (P<.001) higher than mean bond strengths for the other 4 alloys, which were not significantly different from each other.
  
  
  CONCLUSIONS
  Bond strength of a dental ceramic to a Co-Cr alloy is dependent on the alloy composition.
authors.affiliation: Department of Dental Sculpture, Occlusion, and Prosthodontics, Methodist University of Sao Paulo, Sao Bernardo do Campo, Sao Paulo, Brazil.
authors.forename: Renato Morales
authors.initials: RM
authors.lastname: Joias
authors.forename: Rubens Nisie
authors.initials: RN
authors.lastname: Tango
authors.forename: Jose Eduardo
authors.initials: JE
authors.lastname: Junho de Araujo
authors.forename: Maria Amelia
authors.initials: MA
authors.lastname: Junho de Araujo
authors.forename: Guilherme de Siqueira
authors.initials: Gde S
authors.lastname: Ferreira Anzaloni Saavedra
authors.forename: Tarcisio Jose de Arruda
authors.initials: TJ
authors.lastname: Paes-Junior
authors.forename: Estevao Tomomitsu
authors.initials: ET
authors.lastname: Kimpara
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D002858:Chromium Alloys / Q000737:chemistry*; D003722:Dental Alloys / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D006047:Gold Alloys / Q000737:chemistry*; D007854:Lead / Q000737:chemistry; D008422:Materials Testing / Q000295:instrumentation / Q000379:methods; D033081:Shear Strength; D013499:Surface Properties
chemical_list: D002858:Chromium Alloys; D003722:Dental Alloys; D006047:Gold Alloys; D007854:Lead