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Corrosion behavior of dental titanium restrations and implant in fluorode-containing solution

牙科钛修复体和种植体在含氟溶液中的腐蚀行为

基本信息

批准号：
09671996
负责人：
NAKAGAWA Masaharu
金额：
$ 2.24万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09671996/
关键词：
Titanium Titanium alloy Corrosion Fluoride Implant

项目摘要

Titanium is used as a metal for biocompatible materials such as the dental implant or restorations because of an excellent chemical stability. However, the corrosion of Ti in prophylactic fluoride-containing environment comes into a problem. To clarify the effect of fluoride concentration and pH on the corrosion behavior of Ti, Ti-6A1-4V and Ti-6AI-7Nb, anodic polarization tests and immersion tests were carried out in NaF solution of various concentrations(0.05%-2.0%) and pH values(2.0-7.2). The concentrations of dissolved Ti in the test solutions were analyzed by inductively coupled plasma mass spectroscopy. The results showed that corrosion resistance of Ti or Ti alloys markedly decreased in the acidic solution as the fluoride concentration increased. There were obvious limits of fluoride concentration and pH value at which the corrosion behavior of titanium changed from "Non- corrosive" to "Corrosive". This relation indicates whether Ti and Ti alloys will corrode or not, if the fluoride concentration and pH value are known in the concerned environment. The corrosion of Ti in the solution containing fluoride depended on the concentration of hydrofluoric acid (HF). When the HF concentration in the solution was higher than about 30 ppm, the passivation film of the Ti was destroyed.In the fluoride-containing acidic solution, corrosion resistance of Ti and Ti-6AI-7Nb alloy were similar but that of Ti-6AI-4V alloy was inferior to them. Ti-0.2Pd and Ti-10Mo-0.2Pd alloys had a higher corrosion resistance than pure Ti, Ti-6AI-4V and Ti-6AI-7Nb alloys in the fluoride-containing acidic solution. It is thought that corrosion resistance is improved because the surface enrichment of Pd promotes a repass ivation of Ti.

钛因其优异的化学稳定性而被用作生物相容性材料的金属，如牙科植入物或牙种植体。然而，在预防性的含氟环境中，钛的腐蚀成为问题。为了研究氟化物浓度和pH值对Ti、Ti-6Al-4V和Ti-6Al-7 Nb腐蚀行为的影响，在不同浓度（0.05%~ 2.0%）和pH值（2.0-7.2）的NaF溶液中进行了阳极极化试验和浸泡试验。通过电感耦合等离子体质谱法分析测试溶液中溶解的Ti的浓度。结果表明，钛及钛合金在酸性溶液中的耐蚀性随氟浓度的增加而显著降低。钛的腐蚀行为由“无腐蚀性”向“腐蚀性”转变有明显的氟浓度和pH值界限。这种关系表明，如果在有关环境中的氟化物浓度和pH值已知，钛和钛合金是否会腐蚀。钛在含氟溶液中的腐蚀与氢氟酸浓度有关。当溶液中HF浓度大于30 ppm时，Ti的钝化膜被破坏，在含氟酸性溶液中，Ti和Ti-6Al-7 Nb合金的耐蚀性相当，而Ti-6Al-4V合金的耐蚀性不如它们。Ti-0.2Pd和Ti-10 Mo-0.2Pd合金在含氟酸性溶液中的耐蚀性高于纯Ti、Ti-6Al-4V和Ti-6Al-7 Nb合金。据认为，由于Pd的表面富集促进了Ti的再通过，因此耐腐蚀性提高。