Effect of 0.12% chlorhexidine in reducing microorganisms found in aerosol used for dental prophylaxis of pacients submitted to fixed orthodontic treatment

Isis Rodrigues Menezes dos SANTOS, Ana Cristina Azevedo MOREIRA, Myrela Galvão Cardoso COSTA, Marcelo de CASTELLUCCI E BARBOSA

Objective: This study aimed at assessing, in vivo, whether the prior use of 0.12% chlorhexidine as mouthwash would decrease air contamination caused by aerosolized sodium bicarbonate during dental prophylaxis. The study was conducted with 23 patients aged between 10 and 40 years old who were randomly selected and undergoing fixed orthodontic treatment. Methods: The study was divided into two phases (T1 and T2) with a 30-day interval in between. In both phases, dental prophylaxis was performed with aerosolized sodium bicarbonate jetted to the upper and lower arches for 4 minutes. In T1, 10 minutes before the prophylaxis procedure, the participants used distilled water as mouthwash for one minute; whereas in T2, mouthwash was performed with 0.12% chlorhexidine. Microbial samples were collected in BHI agar plates for microbiological analysis. Two dishes were positioned on the clinician (10 cm from the mouth) and a third one at 15 cm from the patient’s mouth. The samples were incubated for 48 hours at 37°C. Results were expressed in colony-forming units (CFU). Results: Statistical analysis carried out by means of Student’s t test, as well as Wilconxon and Kruskal-Wallis tests revealed that the prior use of 0.12% chlorhexidine as mouthwash significantly reduced CFU in the three positions studied (P < 0.001). Conclusion: The prior use of 0.12% chlorhexidine as mouthwash significantly reduced contamination caused by aerosolized sodium bicarbonate during dental prophylaxis in the orthodontic clinic.

Keywords: Aerosol propellant. Effects of air contamination. Chlorhexidine.

How to cite: Santos IRM, Moreira ACA, Costa MGC, Barbosa MC. Effect of 0.12% chlorhexidine in reducing microorganisms found in aerosol used for dental prophylaxis of pacients submitted to fixed orthodontic treatment. Dental Press J Orthod. 2014 May-June;19(3):95-101. DOI: http://dx.doi.org/10.1590/2176-9451.19.3.095-101.oar

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