title: Micro-shear bond strength of resin cement to dentin after application of desensitizing toothpastes.
abstract: OBJECTIVE
  The aim of the study was to evaluate the effect of three desensitizing toothpastes on bonding of resin cements to dentin.
  
  
  METHODS
  The occlusal surfaces of 72 maxillary third molars were ground to obtain flat dentin surfaces and then divided into three groups according to three desensitizing toothpastes used: Sensodyne Rapid Relief (GlaxoSmithKline, SmithKline Beecham Ltd., Slough, UK), Signal Sensitive Expert (Unilever Sanayi ve Ticaret Türk A.Ş., Ümraniye, İstanbul, Turkey) and Colgate Sensitive Pro-Relief (Colgate Palmolive, New York, NY). Following bonding of the resin cement (Clearfil™ SA Cement, Kuraray Co, Osaka, Japan) to dentin, the specimens were light cured for 40 s with a LED (Elipar S10, 3M Espe, St. Paul, MN). The strength measurements were accomplished with a micro-shear testing machine (Bisco, Schaumburg, IL) at a cross-head speed of 0.5 mm/min until the failure occurs. Failure modes were examined using a stereomicroscope and scanning electron microscope. The data were analyzed with one-way analysis of variance (ANOVA) and Tukey HSD test (α = 0.05).
  
  
  CONCLUSIONS
  ANOVA revealed that the application of desensitizing toothpastes had significant effects on bond strength of the resin cement tested to dentin (p < 0.05). Mixed failures were observed in all of the groups.
  
  
  CONCLUSIONS
  The use of a desensitizing toothpaste before cementation might alter the bond strength of adhesively luted restorations.
authors.affiliation: Yüzüncü Yıl University, Faculty of Dentistry, Department of Prosthodontics, Van, Turkey.
authors.forename: Andac Barkin
authors.initials: AB
authors.lastname: Bavbek
authors.forename: Baris
authors.initials: B
authors.lastname: Goktas
authors.forename: Isil
authors.initials: I
authors.lastname: Cekic-Nagas
authors.forename: Ferhan
authors.initials: F
authors.lastname: Egilmez
authors.forename: Gulfem
authors.initials: G
authors.lastname: Ergun
authors.forename: Gurcan
authors.initials: G
authors.lastname: Eskitascioglu
mesh_terms: D003804:Dentin; D008422:Materials Testing; D019279:Resin Cements; D014100:Toothpastes
chemical_list: D019279:Resin Cements; D014100:Toothpastes