The effects of Streptococcus sobrinus on corrosion behavior of metal-ceramic alloys / 实用口腔医学杂志

ABSTRACT

Objective:To study the corrosion resistance of four metal-ceramic alloys in the presence of Streptococcus sobrinus, and to compare the effects of bacteria action in liquid and solid environment.Methods:Four metal-ceramic alloys were exposured to BHIA or BHI media with or without Streptococcus sobrinus and served as different groups. After inoculating 10 weeks, their I_ corr ,E_ corr ,E_ tp through cyclic polarization curves were obtained through Corrview 2 corrosion analyses software;and their surface changes after electrochemical corrosion were observed by field emission scanning electron microscopy (FESEM).Results:The E_ corr of four alloys were decreased in presence of oral microorganism, and the declines were more remarkable in BHI with bacteria. SEM observation showed the pittings in their surface.The corrosion resistance in BHI without bacteria were significant increased than that in the blank control. Conclusion:Streptococcus sobrinus can promote the corrosion behavior of metal-ceramic alloys and the corrosion resistance is more worse in BHI than BHIA with bacteria.