The effect of the use of 2% chlorhexidine gel in post-space preparation on carbon fiber post retention.
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.
da Silva
Ricardo Souza
RS
Dental Materials and Prosthesis Department, Ribeirão Preto School of Dentistry, São Paulo University, Brazil.
de Almeida Antunes
Rossana Pereira
RP
Ferraz
Caio Cézar Randi
CC
Orsi
Iara Augusta
IA
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
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