表没食子儿茶素没食子酸酯（EGCG）对镍铬牙科铸造合金电化学腐蚀后表面性能的影响

[The effect of epigallocatechin gallate (EGCG) on the surface properties of nickel-chromium dental casting alloys after electrochemical corrosion].

作者信息

Qiao Guang-yan, Zhang Li-xia, Wang Jue, Shen Qing-ping, Su Jian-sheng

机构信息

Department of Prosthodontics, Shanghai Stomatology Disease Center. Shanghai 200001;China.E-mail:

出版信息

Shanghai Kou Qiang Yi Xue. 2014 Aug;23(4):413-8.

PMID:25338784

Abstract

PURPOSE

To investigate the effect of epigallocatechin gallate (EGCG) on the surface properties of nickel-chromium dental alloys after electrochemical corrosion.

METHODS

The surface morphology and surface structure of nickel-chromium dental alloys were examined by stereomicroscope and scanning electron microscopy before and after electrochemical tests in 0 g/L and 1.0 g/L EGCG artificial saliva. The surface element component and chemical states of nickel-chromium dental alloys were analyzed by X-ray photoelectron spectrograph after electrochemical tests in 0 g/L and 1.0 g/L EGCG artificial saliva.

RESULTS

More serious corrosion happened on the surface of nickel-chromium alloy in 1.0 g/L EGCG artificial saliva than in 0 g/L EGCG. The diameters of corrosion pits were smaller, and the dendrite structure of the alloy surface was not affected in 0 g/L EGCG. While the diameters of corrosion pits were larger, the dendritic interval of the alloy surface began to merge, and the dendrite structure was fuzzy in 1.0 g/L EGCG. In addition, the O, Ni, Cr, Be, C and Mo elements were detected on the surface of nickel-chromium alloys after sputtered for 120 s in 0 g/L EGCG and 1.0 g/L EGCG artificial saliva after electrochemical corrosion, and the surface oxides were mainly NiO and Cr(2)O(3). Compared with 0 g/L EGCG artificial saliva, the content of O, NiO and Cr(2)O(3) were lower in 1.0 g/L EGCG.

CONCLUSIONS

The results of surface morphology and the corrosion products both show that the corrosion resistance of nickel-chromium alloys become worse and the oxide content of corrosion products on the surface reduce in 1.0 g/L EGCG artificial saliva.

摘要

目的

研究表没食子儿茶素没食子酸酯（EGCG）对镍铬牙科合金电化学腐蚀后表面性能的影响。

方法

在0 g/L和1.0 g/L EGCG人工唾液中进行电化学测试前后，通过体视显微镜和扫描电子显微镜检查镍铬牙科合金的表面形貌和表面结构。在0 g/L和1.0 g/L EGCG人工唾液中进行电化学测试后，用X射线光电子能谱仪分析镍铬牙科合金的表面元素组成和化学状态。

结果

与0 g/L EGCG人工唾液相比，镍铬合金在1.0 g/L EGCG人工唾液中的表面腐蚀更严重。在0 g/L EGCG中，腐蚀坑直径较小，合金表面的枝晶结构未受影响。而在1.0 g/L EGCG中，腐蚀坑直径较大，合金表面的枝晶间距开始融合，枝晶结构模糊。此外，在0 g/L和1.0 g/L EGCG人工唾液中电化学腐蚀后溅射120 s的镍铬合金表面检测到O、Ni、Cr、Be、C和Mo元素，表面氧化物主要为NiO和Cr₂O₃。与0 g/L EGCG人工唾液相比，1.0 g/L EGCG中O、NiO和Cr₂O₃的含量较低。