title: The effect of the use of 2% chlorhexidine gel in post-space preparation on carbon fiber post retention.
abstract: OBJECTIVE
  Evaluate the bond strength of a resin cement used to lute carbon fiber posts, when drills and 4 different substances were used for the post-space preparation.
  
  
  METHODS
  Forty human canines were treated endodontically, and had a 10-mm length post space preparation. Four different substances were used with the drills: G1 -saline, G2 -2% chlorhexidine gel, G3 -EDTA/NaOCl, and G4 -xylene. Carbon fiber posts (C-Post) were cemented with Allbond2 and Hi-X. Then, the posts were dislodged by tensional forces.
  
  
  RESULTS
  The groups of chlrohexidine (G2) and xylene (G4) obtained superior average values of bond strength at the 5% significance level (Parametric analyzes ANOVA/Tukey/Scheffe) differing statistically from the other groups. There was no statistical significant difference between groups 2 and 4.
  
  
  CONCLUSIONS
  Xylene and chlorhexidine gel are good substances for the post-space preparation but the second has the advantage of antimicrobial activity and low toxicity.
authors.affiliation: Dental Materials and Prosthesis Department, Ribeirão Preto School of Dentistry, São Paulo University, Brazil.
authors.forename: Ricardo Souza
authors.initials: RS
authors.lastname: da Silva
authors.forename: Rossana Pereira
authors.initials: RP
authors.lastname: de Almeida Antunes
authors.forename: Caio Cézar Randi
authors.initials: CC
authors.lastname: Ferraz
authors.forename: Iara Augusta
authors.initials: IA
authors.lastname: Orsi
mesh_terms: D000704:Analysis of Variance; D002244:Carbon; D000077482:Carbon Fiber; D002710:Chlorhexidine; D003188:Composite Resins; D003481:Cuspid; D001840:Dental Bonding; D017268:Dental Prosthesis Retention; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D004492:Edetic Acid; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates; D011176:Post and Core Technique; D011897:Random Allocation; D019279:Resin Cements; D012388:Root Canal Irrigants; D018915:Root Canal Preparation / Q000295:instrumentation / Q000379:methods*; D012973:Sodium Hypochlorite; D018709:Statistics, Nonparametric; D013718:Tensile Strength; D014992:Xylenes
chemical_list: D000077482:Carbon Fiber; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C499809:Hi-X Cement; D008689:Methacrylates; D019279:Resin Cements; D012388:Root Canal Irrigants; D014992:Xylenes; C100742:All-Bond 2; D002244:Carbon; D004492:Edetic Acid; D012973:Sodium Hypochlorite; D002710:Chlorhexidine