茸毛链球菌对四种烤瓷合金腐蚀行为的影响  

The effects of Streptococcus sobrinus on corrosion behavior of metal-ceramic alloys

作　　者：陈蕾[1] 蔡惠[1] 方厂云[1] 

机构地区：[1]湖南长沙中南大学湘雅医院口腔科,410008

出　　处：《实用口腔医学杂志》2007年第2期284-287,共4页Journal of Practical Stomatology

摘　　要：目的:研究口腔茸毛链球菌对4种烤瓷合金腐蚀性的影响,并探讨其影响是否因细菌作用环境不同而存在变化。方法:将受试合金与茸毛链球菌在固体或液体培养基中共同培养,以单纯培养基和空白组作为对照,10周后,用电化学方法对测试材料行动电位极化扫描,Corrview2腐蚀分析软件分析获得材料Icorr、Ecorr和Etp,并以场发射扫描电镜观察腐蚀后合金表面形貌。结果:电化学测试结果显示,细菌作用组(C组和D组)较无细菌作用组(B组)自腐蚀电位值偏负,且各合金液体培养基作用组(C组)较固体培养基组(D组)更负。SEM观察到合金表面孔蚀点。而无细菌作用的单纯培养基作用组(B组)较空白组(A组)自腐蚀电位值偏正。结论:口腔茸毛链球菌能够增加烤瓷合金的腐蚀倾向,使合金更易发生腐蚀;且口腔细菌在液体环境较固体环境对合金耐蚀性影响更大。Objective：To study the corrosion resistance of four metal-ceramic alloys in the presence of Streptococcus sobrinus, anti 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 Icorr ,Ecorr ,Etp through cyelic polarization curves were obtained through Corrview 2 corrosion analyses software;and their surface changes after electrochemical eorrosinn were observed by field emission scanning electron microscopy （FESEM）. Results：The Ecorr 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.

关 键 词：茸毛链球菌 烤瓷合金 电化学方法 耐蚀性 

分 类 号：R783[医药卫生—口腔医学]