Evaluation of antimicrobial activity of orthodontic adhesive associated with chlorhexidine-thymol varnish in bracket bonding

Carolina Freire de Carvalho CALABRICH, Marcelo de CASTELLUCCI E BARBOSA, Maria Regina Lorenzetti SIMIONATO, Rogério Frederico Alves FERREIRA

Objective: To assess the antimicrobial activity resulting from the association of an orthodontic adhesive with chlorhexidine-thymol varnish. Methods: Thirty-two extracted human premolars were used, divided into four groups. In Group 1, the control group, the adhesive used to bond the bracket was not associated with any antimicrobial agent. Groups 2, 3 and 4 were bonded with an adhesive system associated with chlorhexidine-thymol varnish. Groups 3 and 4 were stored in water for 7 days and 30 days, respectively, while the specimens from group 2 were, soon after bonding, placed on agar seeded with Streptococcus mutans for 48 hours, at 37º C. Results: The experimental groups, with the exception of the control group, showed antimicrobial activity whose action tended to decline commensurately with the amount of time that they remained immersed in water. Conclusions: The association of chlorhexidinethymol varnish with an adhesive system used in orthodontics proved to be advantageous due to its antimicrobial activity.

Keywords: Chlorhexidine. Adhesives. Antimicrobial agents.

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