Influence of chlorhexidine application at longitudinal push-out bond strength of fiber posts.
OBJECTIVE
The objective of this study was to evaluate the influence of chlorhexidine application after dentin phosphoric acid etching at immediate and long-term bond strength of a fiber post cemented to root dentin.


METHODS
Seventy-two single-rooted, human upper teeth were selected. After phosphoric acid etching, each group received a different dentin treatment: no pretreatment or chlorhexidine 0.2% or 2.0%. Three-step etch-and-rinse adhesive and dual-cured resin cement was used to cementation procedure. Half of the teeth were submitted to push-out bond strength test after 24 hours and the other half after 6 months. Data were analyzed by 2-way ANOVA and Tukey.


RESULTS
Chlorhexidine application had no influence on bond strength when teeth were stored at the same aging time (P > .05). The storage time significantly decreased the bond strength values of 24 hours to 6 months in all groups (P < .05).


CONCLUSIONS
After 6 months, chlorhexidine application did not effectively arrest bond strength degradation of fiber posts cemented in human roots.
Leitune
Vicente Castelo Branco
VC
Dental Materials Laboratory, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil. vicenteleitune@gmail.com
Collares
Fabrício Mezzomo
FM
Werner Samuel
Susana Maria
SM
D000134:Acid Etching, Dental / Q000379:methods; D000328:Adult; D000891:Anti-Infective Agents, Local / Q000737:chemistry*; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002484:Cementation / Q000379:methods; D002710:Chlorhexidine / Q000737:chemistry*; D001840:Dental Bonding; D003786:Dental Pulp Cavity / Q000648:ultrastructure*; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D008875:Middle Aged; D010756:Phosphoric Acids / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry; D018915:Root Canal Preparation / Q000379:methods; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
D000891:Anti-Infective Agents, Local; D017220:Dentin-Bonding Agents; D010756:Phosphoric Acids; D011109:Polymethacrylic Acids; C462240:RelyX ARC; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; D014867:Water; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; C030242:phosphoric acid; D002710:Chlorhexidine