Purpose: The purpose of this study was conducted to compare and evaluate the efficacy of four chemically different immersion types of commercially available denture cleansers on recently fabricated complete dentures in healthy patients, using microbiological quantification method. Materials and Methods: Ten healthy subjects aged 60 – 70 year were selected. Chemical denture cleansers used were divided into four groups; Group I – Sodium hypochlorite solution 0.02% , Group II – Trisodium phosphate , Group III – Sodium perborate and Group IV – Chlorhexidine gluconate 0.2%. Posterior half of the tissue – bearing surface of the denture was swabbed using sterile cotton swabs at four different sites and cultured on blood agar .Net percentage reduction in the colony forming units before and after treatment with each of the above test agents on cultures from above four sites was calculated, tabulated and subjected to statistical analysis Results For all the groups the difference of means were statistically significant. The percentage reduction in streptococcus species count in log units for Groups I, II, III, and IV was found to be 28%, 16%, 10%, and 9% respectively. Conclusion: Cleansing agents were found to be effective in the following order, Sodium hypochlorite solution (0.02%), Trisodium phosphate, Sodium perborate and Chlorhexidine gluconate (0.2%). Clinical Implications: Treatment of dentures with denture cleansers significantly decreases the amount of subsequently formed plaque. The significant reduction in the number of microorganisms observed in this study suggests that the use of chemical cleansers is suitable method for cleaning dentures in geriatric patients.
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