[Corrosion resistance of a new Ti-12.5Zr-3Nb-2.5Sn alloy].
OBJECTIVE
to evaluate the corrosion resistance of a new titanium alloy for dental restoration in artificial saliva.


METHODS
in simulated oral environment, the electrochemical behavior of a new titanium alloy (Ti-12.5Zr-3Nb-2.5Sn) for dental restoration based on the d-electron alloy design method with high elastic modulus, high mechanical and good biological safety properties was investigated together with that of Ti-6Al-4V and TA2 as control groups. The anodic polarization curve and polarization resistance of these alloys were analyzed and the element release of Ti-12.5Zr-3Nb-2.5Sn and Ti-6Al-4V alloy after immersion in artificial saliva for 1, 2, 3, 5, 7, 15 d were measured.


RESULTS
polarization curve indicated that Ti-6Al-4V alloy had lower breakdown potential (0.8 V) than Ti-12.5Zr-3Nb-2.5Sn alloy did (> 2.5 V). Ti-6Al-4V alloy showed higher passivation current density (1.45 × 10(-4) - 1.09 × 10(-3) A/cm(2)) than Ti-12.5Zr-3Nb-2.5Sn alloy (3.32 × 10(-6) - 3.46 × 10(-5) A/cm(2)) and TA2(5.03 × 10(-6) - 2.65 × 10(-5) A/cm(2)) did. Polarization resistance results showed that polarization resistance volume of TA2, Ti-12.5Zr-3Nb-2.5Sn alloy and Ti-6Al-4V alloy were 371.0, 252.0, and 60.1 kΩ×cm(2) respectively. With the increasing of dipping time in artificial saliva, the ion release of Ti-12.5Zr-3Nb-2.5Sn alloy and Ti-6Al-4V alloy increased to different degrees. Ti-6Al-4V alloy always showed more ion release than Ti-12.5Zr-3Nb-2.5Sn alloy did in the experiment.


CONCLUSIONS
data from this study indicated that Ti-12.5Zr-3Nb-2.5Sn alloy, as a dental restoration material, had good corrosion resistance in artificial saliva.
Department of Prosthodontics, Stomatological Hospital, Tianjin Medical University, Tianjin 300070, China.
Xin
X
Hu
Qiang
Q
Wei
Chang-Yi
CY
Li
Jia-Yin
JY
Deng
Shuang
S
Liu
Lian-Yun
LY
Zhang
D000497:Alloys; D003343:Corrosion; D003764:Dental Materials; D004563:Electrochemistry; D008422:Materials Testing; D012464:Saliva, Artificial; D013499:Surface Properties; D014025:Titanium
D000497:Alloys; D003764:Dental Materials; D012464:Saliva, Artificial; C031462:titanium alloy (TiAl6V4); D014025:Titanium