Shanghai Journal of Stomatology ›› 2014, Vol. 23 ›› Issue (4): 413-418.

• Basic Study • Previous Articles     Next Articles

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

QIAO Guang-yan1, ZHANG Li-xia2, WANG Jue1,SHEN Qing-ping1, SU Jian-sheng3   

  1. 1.Department of Prosthodontics, Shanghai Stomatology Disease Center. Shanghai 200001;
    2.Department of Pediatric Dentistry, Jinan Stomatology Hospital. Jinan 250001, Shandong Province;
    3.Department of Prosthodontics, School of Stomatology, Tongji University. Shanghai 200072, China
  • Received:2014-03-21 Online:2014-08-20 Published:2014-10-20
  • Supported by:
    Supported by Youth Fund of Shanghai Municipal Health Bureau (20114Y053), Natural Science Foundation of Shanghai Municipality (12ZR1427200) and Research Fund of Shanghai Municipal Health Bureau (20124172).

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 Cr2O3. Compared with 0 g/L EGCG artificial saliva, the content of O, NiO and Cr2O3 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.

Key words: Epigallocatechin gallate, Nickel-chromium dental alloys, Surface morphology, Corrosion products

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