title: Bond strength of three dental porcelains to Ni-Cr and Co-Cr-Ti alloys.
abstract: Ceramometal bond strength has played an important role for the replacement of gold alloys by nickel-chromium alloys in dentistry. This study evaluated the metal/porcelain bond strength of three ceramic systems (Vita VMK 88, Williams and Duceram) associated with three nickel-chromium alloys (Durabond, Lite Cast B and Resistal P) and one experimental cobalt-chromium-titanium alloy. Thirty cast cylinder specimens (15 mm in height; 6 mm in diameter) were obtained for each alloy, in away that 10 specimens of each alloy were tested with each porcelain. Bond strength was measured with an Emic screw-driven mechanical testing machine by applying parallel shear forces to the specimens until fracture. Kruskal-Wallis and Mann-Whitney U tests were used for statistical analysis of the alloy/ceramic combinations (p<0.05). Resistal P/Duceram had significantly higher bond strength (44.38+/-9.12 MPa) (p<0.05) than the other combinations, except for Co-Cr-Ti alloy/Vita VMK 88 (38.41+/-12.64 MPa). The association of the experimental Co-Cr-Ti alloy with Williams porcelain had significantly higher bond strength (28.20+/-3.86 MPa) than the combination of other alloys with the same porcelain (p<0.05). Based of these results and within the limitations of an in vitro study, it may be concluded that the bond strength of the three ceramic systems to the Ni-Cr and Co-Cr-Ti alloys varied significantly, indicating that metal/ceramic compatibility was very important to the bond strength.
authors.affiliation: Department of Occlusion, Fixed Prosthesis and Dental Materials, Faculty of Dentistry, Federal University of Uberlândia, Uberlândia, MG, Brazil. alfredon@ufu.br
authors.forename: Alfredo Julio
authors.initials: AJ
authors.lastname: Fernandes Neto
authors.forename: Heitor
authors.initials: H
authors.lastname: Panzeri
authors.forename: Flavio Domingues
authors.initials: FD
authors.lastname: Neves
authors.forename: Ricardo Alves do
authors.initials: RA
authors.lastname: Prado
authors.forename: Gustavo
authors.initials: G
authors.lastname: Mendonça
mesh_terms: D002858:Chromium Alloys / Q000737:chemistry*; D003722:Dental Alloys / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D003776:Dental Porcelain / Q000737:chemistry*; D033081:Shear Strength; D018709:Statistics, Nonparametric; D014025:Titanium / Q000737:chemistry*
chemical_list: D002858:Chromium Alloys; D003722:Dental Alloys; D003776:Dental Porcelain; D014025:Titanium