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Effects of different fluorine-containing oral artificial saliva solution on anti-corrosion behavior of selective laser melting cobalt-chromium alloy

ZENG Li1, ZHANG Yong2, YANG Xu1, XIN Xian-zhen1, WEI Bin1   

  1. 1.Department of Stomatology Special Consultation Clininc, the Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai 200011, China； 2.Shanghai Foshion & BEGO CAD/CAM Center， Shanghai Foshion Dental Division， Shanghai 200011, China
  • Online:2014-03-28 Published:2014-04-02
  • Supported by:

    Foundation of Science and Technology Commission of Shanghai Municipality, 12441903001, 13140902701

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Abstract:

Objective To evaluate the effects of different fluoride-containing artificial saliva solution on the corrosion of the dental cobalt-chromium (Co-Cr) alloy fabricated by selective laser melting (SLM). Methods The study involved two groups, each group has 40 cylinder specimens and all specimens were fabricated by the same Co-Cr alloy. One group adopted SLM, while the other group used the cast method. Under conditions of two different pHs (2.5 and 5.0) and four different fluoridecontaining artificial saliva solution concentration (0, 0.05%, 0.1%, and 0.2%), polarization curve tests were performed to compare the anti-corrosion ability of two groups. Results For pH of 5.0 (fluoride-containing artificial saliva solution concentrations were 0 and 0.05%), differences of Rp values between two groups were not statistically significant (P>0.05). For pH of 5.0 (fluoride-containing artificial saliva solution concentration were 0.1% and 0.2%) and pH of 2.5 (fluoride-containing artificial saliva solution concentration were 0, 0.05%, 0.1%, and 0.2%), the Rp value of SLM specimens were significantly higher than those of the cast ones (P<0.05). Conclusion Fluorine can affect the anti-corrosion ability of Co-Cr alloy. SLM specimens exhibited a significantly better anti-corrosion ability than cast ones.

Key words: selective laser melting, Cobalt-chromium alloy, fluoride, anti-corrosion behavior