title: Bond strength of resin cements to Co-Cr and Ni-Cr metal alloys using adhesive primers.
abstract: OBJECTIVE
  The aim of this study was to evaluate the effectiveness of adhesive primers (APs) applied to Co-Cr and Ni-Cr metal alloys on the bond strength of resin cements to alloys.
  
  
  METHODS
  Eight cementing systems were evaluated, consisting of four resin cements (Bistite II DC, LinkMax, Panavia F 2.0, RelyX Unicem) with or without their respective APs (Metaltite, Metal Primer II, Alloy Primer, Ceramic Primer). The two types of dental alloys (Co-Cr, Ni-Cr) were cast in plate specimens (10 x 5 x 1 mm(3)) from resin patterns. After casting, the plates were sandblasted with aluminum oxide (100 microm) and randomly divided into eight groups (n = 6). Each surface to be bonded was treated with one of eight cementing systems. Three resin cement cylinders (0.5 mm high, 0.75 mm diameter) were built on each bonded metal alloy surface, using a Tygon tubing mold. After water storage for 24 hours, specimens were subjected to micro-shear testing. Data were statistically analyzed by two-way ANOVA and Tukey's studentized range test.
  
  
  RESULTS
  The application of Metal Primer II resulted in a significantly higher bond strength for LinkMax resin cement when applied in both metal alloys. In general, the cementing systems had higher bond strengths in Co-Cr alloy than in Ni-Cr.
  
  
  CONCLUSIONS
  The use of AP between alloy metal surfaces and resin cements did not increase the bond strength for most cementing systems evaluated.
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Zip Code: 13414-903, Piracicaba, São Paulo, Brazil.
authors.forename: Marina
authors.initials: M
authors.lastname: Di Francescantonio
authors.forename: Marcelo Tavares
authors.initials: MT
authors.lastname: de Oliveira
authors.forename: Rubens Nazareno
authors.initials: RN
authors.lastname: Garcia
authors.forename: José Carlos
authors.initials: JC
authors.lastname: Romanini
authors.forename: Nelson Renato França Alves
authors.initials: NR
authors.lastname: da Silva
authors.forename: Marcelo
authors.initials: M
authors.lastname: Giannini
mesh_terms: D000269:Adhesives; D000704:Analysis of Variance; D002858:Chromium Alloys; D003035:Cobalt; D003799:Dental Stress Analysis; D008422:Materials Testing; D009532:Nickel; D011897:Random Allocation; D019279:Resin Cements; D055116:Self-Curing of Dental Resins; D033081:Shear Strength; D018709:Statistics, Nonparametric
chemical_list: D000269:Adhesives; D002858:Chromium Alloys; D019279:Resin Cements; D003035:Cobalt; D009532:Nickel