两种口腔致病菌对钴铬和镍铬合金的体外腐蚀行为  

In-vitro corrosion behaviour of cobalt-chromium and nickel-chromium alloys by two oral pathogenic bacteria

作　　者：佘文珺[1] 刘韫嘉 焦婷[1] She Wenjun;Liu Yunjia;Jiao Ting(Department of Prosthodontics,Shanghai Ninth People’s Hospital,College of Stomotology,Shanghai Jiao Tong University School of Medicine,Shanghai Key Laborotory of Stomotology,National Center of Stomotology,National Clinical Research Center of Stomotology,Shanghai 200011;Shanghai Xuhui District Dental Center,Shanghai 200032)

机构地区：[1]上海交通大学医学院附属第九人民医院口腔修复科,上海交通大学口腔医学院,国家口腔医学中心,国家口腔疾病临床研究中心,上海市口腔医学重点实验室,上海200011 [2]上海市徐汇区牙病防治所,上海200032

出　　处：《口腔材料器械杂志》2023年第3期189-194,共6页Chinese Journal of Dental Materials and Devices

基　　金：上海市卫生健康委员会项目(编号:201840022)。

摘　　要：目的通过体外实验,探讨白色念珠菌和变形链球菌对钴铬合金和镍铬合金耐腐蚀性能的影响。方法将10 mm×10 mm×2 mm的钴铬合金和镍铬合金试片高度抛光后分别浸泡于实验组(A组:白色念珠菌组,B组:变形链球菌组)及对照组(C组:BHI培养液组)中8周,应用电化学法测定各组试件片的自腐蚀电流(I_(corr))及极化电阻(R_(p)),并利用扫描电镜观察表面形态。结果电化学法显示钴铬合各组的I_(corr)依次为A组>B组>C组,R_(p)结果显示A组钴铬合金,而R_(p)<钴铬合金,上述差异均具有统计学意义(P<0.05)。结论白色念珠菌、变形链球菌对钴铬合金和镍铬合金有腐蚀作用,相同条件下钴铬合金耐腐蚀性能优于镍铬合金。Objective To investigate the effects of Candida albicans and Streptococcus mutans on the corrosion resistance of cobalt-chromium(Co-Cr)and nickel-chromium(Ni-Cr)alloys in vitro experiments.Methods The 10 mm×10 mm×2 mm Co-Cr and Ni-Cr alloy specimens were highly polished and soaked in the experimental group(group A:Candida albicans,group B:Streptococcus mutans)and control group(group C:BHI culture liquid)for 8 weeks.Self-corrosion current density(I_(corr))and polarization resistance(R_(p))of each specimen were determined by the electrochemical method,and the surface morphology was observed with scanning electron mi-croscopy(SEM).Results Electrochemical method showed that the I_(corr) of Co-Cr and Ni-Cr were A>B>C and R_(p) were A<B<C,which had a statistically significant difference.SEM results showed that the surface morphology of group A and B of Co-Cr and Ni-Cr were rougher than that of group C.In addition,the results of the electrochemical experiment also showed that the corrosion resistance of the two dental alloys was different.The I_(corr) of Ni-Cr in group A,B,and C was greater than that of Co-Cr,and the R_(p) of Ni-Cr in group A,B,and C was smaller than that of Co-Cr,which had a statistically significant difference.Conclusions Candida albicans and Streptococcus mutans had corrosive effects on Co-Cr and Ni-Cr,and the corrosion resistance of Co-Cr under the same conditions was better than that of Ni-Cr.

关 键 词：白色念珠菌 变形链球菌 钴铬合金 镍铬合金 腐蚀 

分 类 号：R783.1[医药卫生—口腔医学]