@article{oai:mdu.repo.nii.ac.jp:00000447,
 author = {坂井原, 巌 and 山添, 正稔 and 安楽, 照男 and 吉田, 貴光 and 田村, 郁 and 永沢, 栄 and 伊藤, 充雄},
 issue = {2},
 journal = {松本歯学},
 month = {Aug},
 note = {application/pdf, The corrosion resistance of twelve commercially available dental precious metal alloys, pure titanium and Ti6A14V alloy was investigated by measuring anodic polarization and open-circuit potential in de-aerated 1 mass%-lactic acid solution. The open-circuit potentials (E_<corr>) ranged from -0.8 to 0.3V vs. SCE and decreased as follows; porcelain-fused-to-metal dental alloys>gold alloys>gold-silver-palladium alloy>silver alloy>pure titanium>Ti6A14V alloy. Open-circuit potentials (E_<corr>) and zero-current potentials (E_z) of the porcelain-fused-to-metal dental alloys and the silver alloy were approximately equal. However, the zero-current potentials (E_z) of the gold alloys, the gold-silver-palladium alloy, the pure titanium and the Ti6A14V alloy were lower than each open-circuit potential (E_<corr>). The critical current densities for passivation (I_<crit>) were of the order of 10^<-3> to 10^1 A・m^<-2>. In the silver alloy, the critical current density sharply increased. The values of common logarithm (Log_<10>Q (E_z+E_<z+0.3>)) of the integrated corrosion values (Q(E_z+E_<z+0.3>)), corresponding to the integrated current density between the zero-current potential (E_z) and the potential of E_z+0.3V (E_z+E_<z+0.3>) vs. SCE, was calculated from the anodic polarization curve. Regression analysis was carried out for their values and nobility (Au+Pt+Pd) atomic% indicated that the values of the common logarithm (Log_<10>Q(E_z+E_<z+0.3>)) varied linearly with nobility (Au+Pt+Pd) atomic% for the twelve commercial dental precious metal alloys. Furthermore, the values of the common logarithm (Log_<10>Q(E_z+E_<z+0.3>)) of the integrated corrosion values (Q(E_z+E_<z+0.3>)) of the gold alloys and the gold-silver-palladium alloy were monotonically proportional to Ag/(Au+Ag+Cu) atomic ratio. Based on the findings of this study, it was suggested that dental precious metal alloys with high nobility and gold alloy with a lower Ag/(Au+Ag+Cu) atomic ratio have high corrosion resistance in the pseudo-oral environment.},
 pages = {200--209},
 title = {歯科用貴金属合金の擬似口腔内環境における腐食挙動},
 volume = {33},
 year = {2007}
}