Abstract Background: Denture liners that are made of silicone have a tendency of being colonised by microbes because they are porous and can store moisture thus providing the optimal environment where bacteria and fungi can thrive. Materials and Methods: Sixty silicone discs (Proclinic Expert) were split into six groups (10 discs each), three of which were treated using 5% iodine and three controls in distilled water and assessed against Streptococcus mutans , Lactobacillus salivarius and Candida albicans . Teams were randomly selected through the computer. Discs were incubated in one week in distilled water, followed by their inoculation. The standard plate count was used to determine the microbial counts (CFU/ml) after incubating the surface swabbed at 37°C and an incubation duration of 24–48 h. Triple experiments were carried out. Results: Treatment with 5% iodine solution significantly reduced microbial colony counts for all tested organisms ( P < 0.005). S. mutans decreased from 191.4 ± 3.8 to 106.2 ± 2.4 CFU/ml, L. salivarius from 175.1 ± 2.7 to 86.8 ± 1.8 CFU/ml, and C. albicans from 115.1 ± 3.9 to 50.0 ± 1.6 CFU/ml, showing the strongest antifungal effect. These results indicate that 5% iodine is highly effective in reducing microbial colonisation on silicone-based resilient liners. Conclusion: The 5% iodine solution demonstrated good antimicrobial action in silicone-based liner contaminated with the oral pathogens in reduction of microbial load in vitro . But no evaluation was done on the effects on the physical and mechanical properties of the liners.
Ahmed et al. (Wed,) studied this question.