title: Effect of oxalate desensitizer on the bonding durability of adhesive resin cements to dentin.
abstract: OBJECTIVE
  This study investigated whether the tubular occluding effect of oxalate desensitizer (OX) during adhesive cementation improved bonding of a self-etch and two etch-and-rinse resin cements to dentin after 6 months.
  
  
  METHODS
  A flat dentin surface was prepared on 120 extracted premolars, which were randomly divided into six groups of 20 teeth each according to the adhesive resin cement system used: ED primer II/Panavia F2.0, Excite DSC (Ex DSC)/Variolink II, and One-Step Plus (OS Plus)/Duolink, with or without OX (BisBlock) application. After cementation of an indirect composite rod, two subgroups (n=10) were tested after 24 h and 6 months of water storage plus thermocycling, and shear bond strengths were recorded in MPa.
  
  
  RESULTS
  Statistical tests showed that although oxalate had a borderline significant negative effect on initial bonding of ED primer II/Panavia F2.0, it significantly improved bonding durability (p<0.05). OX severely compromised the initial bond strength of Ex DSC/Variolink II (p<0.001) but had no effect on the reduction in bonding after aging. OX was compatible with OS Plus/Duolink and did not affect the loss of bonding strength after 6 months (p>0.05).
  
  
  CONCLUSIONS
  Combining an oxalate desensitizer with three types of resin cements had different effects on bond strength to dentin after aging, depending on the interaction of oxalate with the adhesive system associated to the resin cement.
authors.affiliation: Operative Dentistry Department, Dental Faculty, Shiraz University of Medical Sciences, Shiraz, Iran.
authors.forename: Fereshteh
authors.initials: F
authors.lastname: Shafiei
authors.forename: Mahtab
authors.initials: M
authors.lastname: Memarpour
authors.forename: Maryam
authors.initials: M
authors.lastname: Doozandeh
mesh_terms: D001840:Dental Bonding; D003804:Dentin; D057133:Dentin Desensitizing Agents / Q000494:pharmacology*; D006801:Humans; D066298:In Vitro Techniques; D010070:Oxalates / Q000494:pharmacology*; D019279:Resin Cements; D013997:Time Factors
chemical_list: D057133:Dentin Desensitizing Agents; D010070:Oxalates; D019279:Resin Cements; C095998:Adhesive cement