Corrosion resistance of titanium implant abutments and implant suprastructure dental alloys

doi:10.3969/j.issn.2095-4344.2014.47.004

Abstract

Abstract:

BACKGROUND: Domestic scholars use the potentiodynamic polarization technique to determine the corrosion potential of the dental alloys, which is used to evaluate the corrosion performance of the lownoble metal. They have discovered that the main reason affecting corrosion resistance is the content of noble metal.
OBJECTIVE: To evaluate the corrosion resistance of Ti, Au alloy, Co-Cr alloy, Ti alloy, and Ni-Cr alloy.
METHODS: Five alloys were immersed in synthetic saliva solution. The corrosion potential and corrosion current density of the alloys were determined with potentiadynamic polarization technique.
RESULTS AND CONCLUSION: The galvanic series of five kinds of alloys were ranged as follows: Au alloy > pure Ti > Ti alloy > Co-Cr alloy > Ni-Cr alloy. Au alloy and pure Ti had more positive potential that were not easy to produce corrosion; Ti alloy and Co-Cr alloy could form stable oxidation film with a strong ability of anti-pitting and crevice corrosion; Ni-Cr alloy potential was more negative and easy to be dissolved. The corrosion current density of five kinds of alloys was ranged as follows: Au alloy < pure Ti < Ti alloy < Co-Cr alloy < Ni-Cr alloy. Au alloy and pure Ti had lowest current density which was 10^-8, indicating that the corrosion rate of Au alloy and pure Ti was lower; in contrast, Ni-Cr alloy possessed the maximum corrosion rate. These findings indicate that Au alloy and pure Ti exhibit a very high corrosion resistance. The corrosion rate of Ni-Cr alloy is the highest; therefore, Ni-Cr alloy is the least acceptable material for implant suprastucture.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

全文链接：

Key words: titanium, gold alloys, chromium alloys

CLC Number:

R318

Tang Ya, Chen Bi-xin. Corrosion resistance of titanium implant abutments and implant suprastructure dental alloys[J]. Chinese Journal of Tissue Engineering Research, 2014, 18(47): 7561-7565.

Figures/Tables 2

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