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KMID : 0358920170440020170
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Journal of the Korean Academy of Pedodontics
2017 Volume.44 No. 2 p.170 ~ p.179
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Comparison of Cariogenicity of Bovine Milk and Low-fat Milk on Streptococcus mutans Biofilm
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Hwang Min-Seon
Park Ho-Won
Lee Ju-Hyun
Seo Hyun-Woo
Lee Si-Young
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Abstract
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The purpose of this study was to compare the cariogenicity of commercially available bovine milk and low-fat milk in a biofilm model using the CDC Biofilm Reactor. Streptococcus mutans ATCC 25175 biofilms were formed on saliva coated bovine enamel slabs in a CDC Biofilm Reactor. Biofilms were exposed three times per day to one of the following materials: commercial whole milk (fat content: 3.4%), low-fat milk (fat content: 1%), or 0.9% NaCl. Medium pH was measured at different time points. After 5 days, biofilms were separated from slabs to evaluate the CFUs. The biofilm thickness was observed by confocal laser-scanning microscopy (CLSM). Enamel slab’s demineralization was assessed by measuring surface microhardness before and after the experiment. For microhardness and CFUs assessment, no significant difference was found among the three groups. All groups showed similar pattern of medium pH change and biofilm thickness. Our results showed that there was no difference in the cariogenicity between whole milk and low-fat milk. Both milks were relatively non-cariogenic compared to the control group.
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KEYWORD
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Cariogenic , Milk , Fat , Streptococcus mutans , Biofilm
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