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Objective: This study aimed to evaluate the contamination of toothbrushes usedby patients with disabilities, by microbial culture and cariogenic biofilm formation,and to explore two methods of disinfection. Methods: Experimental procedures were divided into three stages, with the same interval between each stage. In thefirst stage, the patients brushed their teeth, rinsed them with water, and their toothbrushes were sprayed with sterilized tap water. In the second and third stages, the steps were similar to those of Stage I, except the toothbrushes were sprayed with 0.12% chlorhexidine and 0.05% cetylpyridinium chloride solutions, respectively. At the end of each stage, the toothbrush bristles were cultured in bacitracin sucrose broth (CaSaB) medium. Data were analyzed through Friedman’s nonparametric test (5% significance level). Results: In Stage I, mutans group streptococci (MS) were present in 30 toothbrushes (76.9%), and the number ofcolonies/biofilms ranged from 0 to +100. In Stage II, no MS colonization was observed. In Stage III, only 10.2% of the toothbrushes were contaminated with MS, and the number of colonies/biofilms ranged from 1 to 31. Conclusion: Bristles of toothbrushes used by patients with disabilities became contaminated with MS after a single brushing. The 0.12% chlorhexidine solution eliminated all microorganisms from the bristles of the toothbrushes used by the patients. Both 0.12% gluconate chlorhexidine and 0.05% cetylpyridinium chloride spray solutions can effectively be used for toothbrush disinfection to reduce contamination.

Evaluation of microbial contamination and efficacy of antimicrobial agents in disinfection of handicapped patients’ toothbrushes