上海交通大学学报（医学版）

›› 2012, Vol. 32 ›› Issue (5): 602-.doi: 10.3969/j.issn.1674-8115.2012.05.015

• 论著（基础研究） • 上一篇    下一篇

选择性激光熔化技术制作牙科钴铬合金的电化学腐蚀性能研究

忻贤贞, 项 楠, 陈 洁, 徐 丹, 魏 斌   

  1. 上海交通大学 医学院附属第九人民医院口腔修复科 |上海市口腔医学重点实验室, 上海 200011
  • 出版日期:2012-05-28 发布日期:2012-06-01
  • 通讯作者: 魏 斌, 电子信箱: weibin0328@hotmail.com。
  • 作者简介:忻贤贞（1986—）, 女, 硕士；电子信箱: kristy-xxz@hotmail.com。
  • 基金资助:

    上海市科委基金（08DZ2271100）；上海市重点学科建设项目（T0202, S30206）

Electrochemical-corrosion behavior of dental cobalt-chromium alloy fabricated by selective laser melting technique

XIN Xian-zhen, XIANG Nan, CHEN Jie, XU Dan, WEI Bin   

  1. 1.Department of Prosthodontics, the Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai 200011, China
  • Online:2012-05-28 Published:2012-06-01
  • Supported by:

    Shanghai Science and Technology Committee Foundation, 08DZ2271100； Shanghai Leading Academic Discipline Project, T0202, S30206

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摘要：

目的 采用针对区域选择性激光熔化（SLM）技术制作钴铬合金口腔修复材料，考量其在特殊口腔环境中的电化学腐蚀性能。方法 选取具有相同成分的钴铬（Co-Cr）合金金属粉末和金属块，分别运用SLM技术（SLM组，n=5）和传统的铸造工艺（对照组，n=5）制作适用于口腔修复的Co-Cr合金试件（圆柱形，直径10 mm，厚度3 mm）。模拟特殊口腔环境（未进食pH值为5.0，进食后pH值为2.5），采用电化学交流阻抗谱的方法获取相关拟合数据，根据极化电阻值Rp分析两组试件的耐腐蚀性能。结果 当模拟口腔环境中pH值为5.0时，SLM组和对照组的Rp值分别为4.25±1.11和3.82±1.40，组间比较差异无统计学意义（P>0.05）；当模拟口腔环境中pH值为2.5时，SLM组和对照组的Rp值分别为5.83±0.88和3.49±0.83，组间比较差异有统计学意义（P<0.05）。结论 与传统铸造工艺制作相比，SLM技术制作的钴铬合金修复体在进食后的酸性口腔环境中具有更好的耐腐蚀性能。

关键词: 钴铬合金, 腐蚀, 电化学交流阻抗谱

Abstract:

Objective To investigate the electrochemical-corrosion behavior of a dental cobalt-chromium (Co-Cr) alloy fabricated by selective laser melting (SLM) under conditions simulating the oral environment. Methods Co-Cr alloy specimens for dental use (cylinder, 10 mm in diameter and 3 mm in thickness) were obtained by fabrication with the same Co-Cr alloy using SLM technique (SLM group, n=5) or traditional cast technique (control group, n=5). The electrochemical-corrosion behavior of the specimens were analysed with the parameter of polarization resistance (Rp), which was examined with electrochemical impedance spectroscopy tests in an artificial saliva solution with two different pHs (before diet, 5.0; after diet, 2.5). Results At pH of 5.0, Rp values of SLM group and control group were 4.25±1.11 and 3.82±1.40 respectively, and there was no significant difference between two groups (P>0.05). At pH of 2.5, Rp values of SLM group and control group were 5.83±0.88 and 3.49±0.83 respectively, and there were significant differences between two groups (P<0.05). Conclusion Compared with traditional cast technique, dental Co-Cr alloy fabricated by SLM has better anti-corrosion behavior in acid oral environment after diet.

Key words: cobalt-chromium alloy, corrosion, electrochemical impedance spectroscopy