Evaluation of Risks in the Coexistence of Dental Alloys with the Galvanic Corrosion

在本项目中，目的是评估三种组合组的电偶腐蚀风险，这三种组合组包括钛和钛合金接触的牙科贵重合金和非贵重合金，牙科磁性附件中几种不锈钢接触的牙科贵重合金和钛，以及含银焊料的正畸丝。虽然钛和钛合金增加了第一组贵金属合金释放的Ag和Cu离子，但4型金合金和钛的组合释放的离子总量最少。因此，这种组合可能更适合种植牙。另一方面，钛和钛合金的离子释放量略有增加，因为它们的静电位接近于非贵重合金。镍离子释放少的组合可以预见是Co-Cr合金和钛，或Co-Cr合金和Ti-6Al-4V合金。第一组接触钛较多，当钛与汞合金的表面积比极大增加10倍时，释放出大量的Sn（常规型）或Cu（高铜型）离子。汞合金与钛的结合有电偶腐蚀的危险。在第二组不锈钢和贵重合金中，铁素体不锈钢SUS447J1即使与高克拉金合金接触也会少量释放出铁离子，表现出非常高贵的休息潜力。几乎不锈钢与静止电位极高的Pt-Fe-Nb磁铁合金接触时，有时会产生点蚀并释放大量离子，但SUS447J是稳定的。SUS447J1是最适合做牙科磁性附件的不锈钢。当银焊料的表面积比增大到10倍时，正畸Co-Cr和不锈钢中释放的Fe和Ni离子增加。相反，锡和铜离子从银焊料中释放出来，比表面积下降了1/10。少

In this project, the objective is to evaluate risks of the galvanic corrosion in the three types of the combination groups including dental precious and non-precious alloys contacted with titanium and titanium alloys, dental precious alloys and titanium contacted with several stainless steels for dental magnetic attachments, and orthodontic wires with silver solder. Although, titanium and titanium alloys increase Ag and Cu ions released from the precious alloys in the first group, the combination of Type 4 gold alloy and titanium showed the least total amount of ions released from them. Thus, this combination is probably better adapted to dental implants. On the other hand, titanium and titanium alloy slightly increased the ions released from non-precious alloys, since their rest potentials were close to non-precious alloys. The vest combination with little released Ni ions predictably seemed Co-Cr alloy and titanium, or Co-Cr alloy and Ti-6Al-4V alloy. Dental amalgams contacted with t … More itanium in the first group, released quit a lot of Sn (Conventional type) or Cu (High copper type) ions when the surface area ratio of titanium to the amalgams extremely increased at 10 times. The combination of amalgams and titanium has a risk of the galvanic corrosion. In the second group of the stainless steels and the precious alloys, the ferritic stainless steel SUS447J1 slightly released Fe ions even if it contacted with a high carat gold alloy showing very noble rest potential. Almost stainless steels contacted with Pt-Fe-Nb magnet alloy which had extremely noble rest potential, sometime caused pitting corrosion and released quit a lot of ions, but SUS447J was stable. SUS447J1 is the most suitable stainless steel for the dental magnetic attachment. Soldering increased Fe and Ni ions released from orthodontic Co-Cr and stainless steel when the surface area ratio of the silver solder was getting large at 10 times. Adversely, Sn and Cu ions released from the silver solder, the surface area ratio decreased at 1/10. Less