title: Effect of 2% chlorhexidine digluconate on bond strength of a glass-fibre post to root dentine.
abstract: OBJECTIVE
  To assess the immediate influence of dentine bonding systems (DBS) associated with 2% chlorhexidine digluconate (CHX) on glass-fibre post-bond strength to root dentine, in terms of coronal, middle and apical thirds.
  
  
  METHODS
  Sixty bovine roots were root filled and randomly assigned to 1 of 6 groups (n = 10): SBMP (3-step etch-and-rinse system, Scotchbond Multi-Purpose), SB (2-step etch-and-rinse system, Single Bond 2), SE (2-step self-etching system, Clearfil SE Bond) and SBMP-CHX, SB-CHX and SE-CHX, respectively, associated with CHX. For all groups, a glass-fibre post was luted with a dual-cure resin cement, RelyX ARC. After 7-day storage, specimens were subjected to the push-out test. Failure modes were analysed under optical microscopy (40x). Bond strength values were statistically analysed by two-way anova and Bonferroni tests (P < 0.05).
  
  
  RESULTS
  The effect of DBS was significant (P < 0.05), and SE reached higher bond strength in comparison with the other DBS tested. CHX association did not show improvement with any DBS (P > 0.05); rather, it negatively affected SE, which was detected for all thirds. There was no difference between thirds (P > 0.05), except for the SE-CHX, which presented lower values for the apical third (P < 0.05). Adhesive cement/dentine adhesive failure was predominant for all groups. CHX did not influence the failure mode for any DBS (P > 0.05).
  
  
  CONCLUSIONS
  The performance of the dentine bonding systems was material dependent. CHX did not improve immediate bond strength; however, CHX negatively affected the bond strength of the self-etching system, especially in the third apical.
authors: Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil. wang.linda@usp.br
authors: L
authors: L
authors: Wang
authors: T A
authors: TA
authors: Pinto
authors: L M
authors: LM
authors: Silva
authors: D F G
authors: DF
authors: Araújo
authors: L M
authors: LM
authors: Martins
authors: A R
authors: AR
authors: Hannas
authors: A P R V
authors: AP
authors: Pedreira
authors: P A S
authors: PA
authors: Francisconi
authors: H M
authors: HM
authors: Honório
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000818:Animals; D000891:Anti-Infective Agents, Local / Q000737:chemistry*; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002417:Cattle; D002710:Chlorhexidine / Q000031:analogs & derivatives* / Q000737:chemistry; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D003786:Dental Pulp Cavity / Q000648:ultrastructure*; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005898:Glass / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation*; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry; D055116:Self-Curing of Dental Resins; D013314:Stress, Mechanical; D013997:Time Factors; D019227:Tooth Apex / Q000648:ultrastructure
chemical_list: C554641:Adper single bond 2; D000891:Anti-Infective Agents, Local; C438313:Clearfil SE Bond; D003738:Dental Cements; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D011109:Polymethacrylic Acids; C462240:RelyX ARC; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; C009753:fiberglass; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; C010882:chlorhexidine gluconate; D002710:Chlorhexidine
keywords: bond strength; chlorhexidine; dentine bonding system; fibre post