In vivo degradation of orthodontic miniscrew implants: surface analysis of as-received and retrieved specimens

  • Masahiro Iijima
  • Takeshi Muguruma
  • Masahiro Kawaguchi
  • Yoshitaka Yasuda
  • Itaru Mizoguchi
Biocompatibility Studies
Part of the following topical collections:
  1. Biocompatibility Studies


This study investigated in vivo degradation of Ti–6Al–4V alloy miniscrew implants. Miniscrew implants were placed in patients, and the surfaces were studied upon retrieval by scanning electron microscopy, microscale X-ray photoelectron spectroscopy, elastic recoil detection analysis and nanoindentation testing. Bone-like structures were formed on the retrieved specimens. The hardness and elastic modulus of the surfaces of the retrieved specimens were significantly lower than the as-received specimens, although no statistically significant differences were observed for the hardness and elastic modulus in the bulk region. Thick organic over-layer containing carbon, oxygen, and nitrogen, with the thickness greater than 50 nm, covered the retrieved specimens, and higher concentrations of hydrogen were detected in the retrieved specimens compared with the as-received specimens. Minimal degradation of the bulk mechanical properties of miniscrew implants was observed after clinical use, although precipitation of bone-like structures, formation of a carbonaceous contamination layer, and hydrogen absorption were observed on the surfaces of miniscrew implants.


Titanium Alloy Hydrogen Absorption Hydrogen Embrittlement Hydrogen Fluoride Elastic Recoil Detection Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This study was partially supported by the Research Project of the Research Institute of Personalized Health Sciences, Health Sciences University of Hokkaido.


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Masahiro Iijima
    • 1
  • Takeshi Muguruma
    • 1
  • Masahiro Kawaguchi
    • 2
  • Yoshitaka Yasuda
    • 3
  • Itaru Mizoguchi
    • 1
  1. 1.Division of Orthodontics and Dentofacial Orthopedics, Department of Oral Growth and Development School of DentistryHealth Sciences University of HokkaidoIshikari-TobetsuJapan
  2. 2.Commercialization Support Department Advanced Analysis and Development SectorTokyo Metropolitan Industrial Technology Research InstituteTokyoJapan
  3. 3.Yasuda Orthodontic OfficeNishinomiya, HyogoJapan

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