Effect of Chlorhexidine Gel in Mentally Handicapped Children highly Infected with Streptococcus Mutans

Objective: To evaluate the effect of 1% chlorhexidine (CHX) gel on mentally handicapped children (n=11) highly infected with Streptococcus mutans (SM) and evaluate the re-colonization time of this bacterium after the treatment period.. Material and Methods: Before CHX treatment, saliva samples were collected to establish baseline saliva SM levels. CHX gel was daily applied for 5 min, for 7 consecutive days. Saliva samples were then collected after 7, 30, 60, 90 and 120 days to evaluate SM oral recolonization. Data were analyzed by the Wilcoxon test (alpha=0.05). Results: When compared to baseline (5.7 / 3.0 x 105), the collection performed 7 days after CHX treatment (0.06 / 0.2 x 105) showed a significant reduction (P < 0.05) in SM saliva levels (mean / s.d., CFU ml-1). In subsequent collections, a gradual SM re-colonization was observed, and after 60 days of treatment, the levels of this bacterium (0.8 / 0.9 x 105) no longer statistically differed from SM levels considered high risk to caries (105) (P> 0.05). Conclusion: Treatment with CHX gel for 7 days was effective in reducing the SM levels of mentally handicapped children and should be repeated after 60 days to control the risk of caries in these children.