Abstract:
Objective
This study aimed to investigate the influence of tea polyphenols on the corrosion behavior of dental casting alloy.
Methods
The corrosion potential， self-corrosion current density and polarization resistance of Ni-Cr， Co-Cr and pure titanium immersed in artificial saliva and artificial saliva solutions with tea polyphenols of concentrations of 1.25， 2.50 and 5.00 g/L were detected with potentiodynamic polarization test.
Results
It was showed that compared with the artificial saliva， the corrosion rate （Icorr） of Ni-Cr alloy was significant increased in 1.25 g/L tea polyphenols artificial saliva solution （P ＜0.01）， and the Icorr value decreased with the increasing concentration.There were significant differences among the corrosion rates of Co-Cr alloy immersed in the four concentrations of tea polyphenols artificial solutions （P ＜0.01）.The corrosion rate of Co-Cr alloy in the 1.25 g/L tea polyphenols solution was significantly lower than that in artificial saliva （P ＜0.01）.Titanium showed a higher corrosion resistance and better biocompatibility.The corrosion rates of titanium in the four kinds of electrolytes were significantly lower than that of Ni-Cr and Co-Cr alloys （P ＜0.01）.
Conclusions
The patients with teadrinking habit are not suggested to choose Ni-Cr alloy for dental prostheses； the patients with restoration of Co-Cr alloy and pure titanium can drink moderate tea； strong tea is not recommended for patients wearing dental prostheses of all these three kinds of alloys.
Key words:
Tea polyphenols,
Dental casting alloy,
Corrosion
Jian-sheng SU, Wen-fei HAN, Zhi-juan TIAN, Zhen-lan LUO. Influence of tea polyphenols artificial saliva solutions with different concentrations on the corrosion behavior of dental casting alloy[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2010, 4(03): 254-260.