| Objective: To study the correlation between Streptococcus mutans' adhesion and surface corrosion of the casting titanium and Ti alloy with different kinds of polishing. To interpret the corrosion mechanism of the casting titanium and Ti alloy in the oral environment.Materials and Methods: The casting titanium and Ti Alloy were respectively processed into size of 30mm×8 mm×1mm in tablets. Each material prepares for Thirty-two specimens, randomly divided into two groups, dealt with mechanical polishing and electrochemistry polishing, each group were then randomly divided into four groups (blank control, media control, inoculated media control for three months and six months group), 4 specimens were used in each group under the hypoxia conditions. The labeled specimen surfaces were then aseptically placed in the test tube with one transfer per week. The specimens were removed and sterilized. Measure the surface roughness of specimens by FTS i120 contourgraph and observe the alteration of the surface by SIRION scanning electron microscope. One- way ANOVA with SPSS11.0 was used for statistical analysis.Results: Blank control groups,media control groups showed no influence on Ra value(P>0.05). As casting titanium, blank control groups,media control groups, inoculated media control for three months and six months group showed no influence on Ra value(P>0.05).As Ti alloy, the Ra value of the inoculated media control groups were significantly different from those of blank control groups(P<0.05) and media control groups(P<0.05). The specimen showed no influence on Ra value whether it dealt with mechanical polishing or electrochemistry polishing. All the specimen surfaces have pitting in disorder and in different size, but the specimen surfaces of casting titanium has less pitting.Conclusion: Streptococcus mutans' adhesion causes surface corrosion of the casting titanium and Ti alloy, and mechanical polishing and electrochemistry polishing have no influence on the corrosion.
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