Influence of antimicrobial solutions in the decontamination and adhesion of glass-fiber posts to root canals

Objective: this study evaluated the effect of root canal disinfectants on the elimination of bacteria from the root canals,as well as their effect on glass-fiber posts bond strength. material and methods: fifty-three endodontically treated root canals had post spaces of 11 mm in length prepared and contaminated with e. faecalis. for cfu/ml analysis,eight teeth were contaminated for 1 h or 30 days (n=4). teeth were decontaminated with 5% naocl,2% chx,or distilled water. as control,no decontamination was conducted. after decontamination,sterile paper points were used to collect samples,and cfu/ml were counted. for push-out,three groups were evaluated (n=15): irrigation with 2.5% naocl,2% chx,or sterile distilled water. a bonding agent was applied to root canal dentin,and a glass-fiber post was cemented with a dual-cured cement. after 24 h,1-mm-thick slices of the middle portion of root canals were obtained and submitted to the push-out evaluation. three specimens of each group were evaluated in scanning electron microscopy (sem). data were analyzed with one-way anova and dunnett’s t3 test (α=0.05). results: the number of cfu/ml increased from 1 h to 30 days of contamination in control and sterile distilled water groups. decontamination with naocl was effective only when teeth were contaminated for 1 h. chx was effective at both contamination times. naocl did not influence the bond strength (p>0.05). higher values were observed with chx (p<0.05). sem showed formation of resin tags in all groups. conclusion: chx showed better results for the irrigation of contaminated root canals both in reducing the bacterial contamination and in improving the glass-fiber post bonding. © 2015,faculdade de odontologia de bauru. all rights reserved.