权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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

牙科合金与电偶腐蚀共存的风险评估

基本信息

批准号：
12671871
负责人：
TAKADA Yukyo
金额：
$ 2.3万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12671871/
关键词：
DENTAL ALLOY ELUTION TEST GALVANIC CORROSION RELEASED IONS REST POTENTIAL SURFACE AREA RATIO ANODIC POLARIZATION CURVES ALLERGY 異種金属接触腐食アノード分極耐食性安全性

项目摘要

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

本项目的目的是评估三种类型组合组的电偶腐蚀风险，包括与钛和钛合金接触的牙科贵金属和非贵金属合金、与牙科磁性附着体的多种不锈钢接触的牙科贵合金和钛、以及带有银焊料的正畸线材。尽管钛和钛合金增加了第一组贵合金中释放的Ag和Cu离子，但是4型金合金和钛的组合显示出从它们释放的离子总量最少。因此，这种组合可能更适合牙种植体。另一方面，钛及钛合金由于其静止电位接近于非贵合金，因此略微增加了非贵合金释放的离子。预计释放很少的Ni离子的背心组合是Co-Cr合金和钛，或者Co-Cr合金和Ti-6Al-4V合金。第一组与钛接触的牙科汞合金，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。汞合金和钛的组合存在电偶腐蚀的风险。在第二组不锈钢和贵合金中，铁素体不锈钢SUS447J1即使与高克拉金合金接触也会轻微释放Fe离子，表现出非常高贵的静止电势。几乎所有不锈钢与具有极高静止电位的Pt-Fe-Nb磁体合金接触，有时会引起点蚀并释放出大量离子，但SUS447J是稳定的。 SUS447J1 是最适合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，焊接会增加正畸Co-Cr和不锈钢中释放的Fe和Ni离子。相反，Sn和Cu离子从银焊料中释放出来，表面积比下降到1/10。较少的