title: Effect of oxalate desensitizer on the durability of resin-bonded interfaces.
abstract: Potassium oxalate desensitizers were previously shown to effectively reduce the immediate permeability of resin-bonded dentin. The current study evaluated whether the effect of the combined application of oxalate with etch-and-rinse adhesives interferes with the durability of resin-dentin bonds when using etch-and-rinse adhesives. The bond strength of resin-bonded dentin specimens composed of two-step or three-step etch-and-rinse adhesives (Single Bond, One-Step and Scotchbond Multi-Purpose, respectively) was tested immediately (24 hours) and after 12 months of water storage. The adhesives were used either according to the manufacturers' instructions (control groups) or after treating acid-etched dentin with a potassium oxalate gel (BisBlock, BISCO, Inc). The treatment of dentin with potassium oxalate was shown to negatively affect the baseline bond strength of resin-bonded dentin specimens, regardless of the adhesive used (p < 0.05). After storage, the bond strength of the resin-bonded interfaces was significantly reduced for all the tested groups (p < 0.001). Nevertheless, the rate of decreasing bond strength was significantly lower for oxalate-treated specimens than for the controls (p < 0.05).
authors.affiliation: Department of Restorative Dentistry, Dental Materials, Piracicaba School of Dentistry, University of Campinas, Piracicaba, SP, Brazil.
authors.forename: Safria Marques
authors.initials: SM
authors.lastname: De Andrade e Silva
authors.forename: Juliana
authors.initials: J
authors.lastname: Malacarne-Zanon
authors.forename: Ricardo Marins
authors.initials: RM
authors.lastname: Carvalho
authors.forename: Marcelo Corrèa
authors.initials: MC
authors.lastname: Alves
authors.forename: Mario Fernando
authors.initials: MF
authors.lastname: De Goes
authors.forename: Andréa
authors.initials: A
authors.lastname: Anido-Anido
authors.forename: Marcela Rocha
authors.initials: MR
authors.lastname: Carrilho
mesh_terms: D000134:Acid Etching, Dental; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure; D057133:Dentin Desensitizing Agents / Q000737:chemistry*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D010070:Oxalates / Q000737:chemistry*; D019815:Oxalic Acid / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: C103506:Bis-GMA, BPDM, HEMA dental-bonding resin; C514542:BisBlock; D003188:Composite Resins; D057133:Dentin Desensitizing Agents; D017220:Dentin-Bonding Agents; C444701:Filtek Z250; D008689:Methacrylates; D010070:Oxalates; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; C115612:single bond; D014867:Water; D017438:Bisphenol A-Glycidyl Methacrylate; D019815:Oxalic Acid