Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (42): 7855-7858.doi: 10.3969/j.issn.1673-8225.2011.42.016

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Corrosion evaluation of NiTi orthodontic wires under simulated human oral environment

Wang Qiang1,2, Na Ying1, Zhan De-song1, Feng Cui-juan1, Zhang Yang1   

  1. 1School of Stomatology, China Medical University, Shenyang  110002, Liaoning Province, China
    2Institute of Metal Research, Chinese Academy of Sciences, Shenyang  110016, Liaoning Province, China
  • Received:2011-01-10 Revised:2011-03-09 Online:2011-10-15 Published:2011-10-15
  • Contact: Zhang Yang, Professor, Doctoral supervisor, School of Stomatology, China Medical University, Shenyang 110002, Liaoning Province, China mfqwang@yahoo.com.cn
  • About author:Wang Qiang☆, Studying for doctorate, Assistant researcher, School of Stomatology, China Medical University, Shenyang 110002, Liaoning Province, China; Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning Province, China
  • Supported by:

    the Natural Science Foundation of Liaoning Province, No. 20082088, 20092093*

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Abstract:

BACKGROUND: Corrosion occurs during dental materials service in oral environment and leads to the release of metal ions. According to the theory of modern metal corrosion, biological effects of metals and alloys depend on the released elements type and content.  
OBJECTIVE: To compare the corrosion characteristics of two clinically used NiTi arch wires.
METHODS: The microstructure and composition of two wires were studied by optical microscope and EDS. Cyclic polarization and immersion test were carried out to comparatively evaluate the corrosion characteristics of the two orthodontic wires in artificial saliva at 37 ℃. 
RESULTS AND CONCLUSION: The microstructure and composition of the two wires are somewhat different. Cyclic polarization reveals that the corrosion potential of A wire is higher while corrosion current lower. Oxide film formed on the surface of A wire is more stable and protective. The corrosion resistance of A wire is better than that of B wire resulted from the difference of microstructure, composition and processing technique.

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