Abstract
The penetration by bacteria through dentinal tubules was studied using a device that included portions of bovine anterior teeth. Strain of 4 genera, Streptococcus mutans, Lactobacillus casei, Staphylococcus aureus and Eschelichia coli were used for the experiment, and effects of hydraulic pressure to the dentin surface on the rate of bactrial penetration were examined.The MPT50 for the tested strains was reduced in every case by elevated hydraulic pressure. Under conditions of high or low pressure, S. mutans showed the slowest penetration among the strains tested.From these results, it is suggested that the hydraulic pressure against the dentinal tubules have an important effect on bacterial penetration through these tubules.
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